Gas pipeline sampling device

Abstract

The utility model discloses a gas pipeline sampling device which is used for introducing gas to be detected in a gas pipeline into a gas detection sensor for detection, and comprises a piston valve assembly which is detachably mounted at one end, provided with a gas sample interface, of the gas detection sensor; a gas sample channel is correspondingly arranged on the piston valve assembly, and one end of the gas sample channel is used for being in butt joint with the gas sample connector; one end of the sampling pipe is used for extending into a gas pipeline, and flowing gas in the gas pipeline can be sampled; a sampling gas path is correspondingly arranged in the sampling pipe, and the sampling gas path is communicated with the other end of the gas sample passage; the gas pipeline parameter sensor solves the technical problems that manual valves are arranged on all gas paths of a gas pipeline parameter sensor in the prior art, valve rods need to be manually loosened and tightened one by one during switching of all the valves, and operation is complex.

Description

Technical Field

[0001] The utility model relates to the field of pipeline gas monitoring, and particularly relates to a gas pipeline sampling device. Background Art

[0002] Monitoring of gas pipeline parameters often includes monitoring of flow rate, pressure, temperature, and gas concentration. Whether it is a split sensor or an integrated multi-parameter sensor, regular calibration and maintenance are required. It is necessary to correct the zero point or linearity of the sensor to ensure the accuracy of sensor monitoring.

[0003] At present, most sensors on the market mainly change the gas path by adjusting a three-valve group or a multi-valve group, so as to create conditions for flow rate or gas concentration calibration. Whether it is a three-valve group or a multi-valve group, it includes multiple valve stems such as a high-end pressure valve, a low-end pressure valve, a balance valve, and a monitoring gas path on-off valve. Manually tightening and loosening each valve stem one by one is relatively complicated, and the synchronization of valve stem tightening and loosening is poor.

[0004] Therefore, in view of the above technical problems, it is necessary to improve the gas pipeline sampling device to reduce the structural complexity and operation difficulty. Content of the Utility Model

[0005] The purpose of the utility model is to provide a gas pipeline sampling device to solve the technical problem that manual valves are arranged on each gas path of the gas pipeline parameter sensor in the prior art, and the switching of each valve requires manually tightening and loosening each valve stem one by one, and the operation is relatively complicated.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model discloses a gas pipeline sampling device for introducing a gas to be measured in a gas pipeline into a gas detection sensor for detection; it includes a piston valve assembly, the piston valve assembly is used for detachably installing at one end of the gas detection sensor with a gas sample interface, a gas sample passage is correspondingly arranged on the piston valve assembly, and one end of the gas sample passage is used for docking with the gas sample interface; it further includes a sampling tube, one end of the sampling tube is used for extending into the gas pipeline to sample the flowing gas in the gas pipeline; a sampling gas path is correspondingly arranged in the sampling tube, and the sampling gas path is communicated with the other end of the gas sample passage; when the piston valve assembly is in the initial state, it can keep the gas sample passage unblocked, so that the gas to be measured can enter the gas detection sensor through the sampling gas path, the gas sample passage and the gas sample interface in sequence; when the piston valve assembly works, it can disconnect the gas sample passage to prevent the gas to be measured from entering the gas detection sensor.

[0008] The working principle of this solution is as follows: When detecting the gas to be measured, the piston valve assembly is in the initial state. In this way, the gas to be measured sequentially passes through the sampling gas path, the gas sample path, and the gas sample interface and enters the gas detection sensor for detection. When it is temporarily not necessary to detect the gas to be measured, the piston valve assembly is made to work to prevent the gas to be measured from entering the gas detection sensor;

[0009] The connection between the sampling tube and the piston valve assembly, as well as the connection between the piston valve assembly and the gas detection sensor, are both detachable connections. When it is no longer necessary to detect the gas to be measured or when it is necessary to repair the sampling tube, the piston valve assembly, or the gas detection sensor, each component can be removed, which is convenient for operation, maintenance, and replacement.

[0010] Under normal circumstances, the gas detection sensor can detect multiple parameters simultaneously, or there are multiple gas paths corresponding to each parameter. In the prior art, usually, each gas path is provided with a valve. During detection, it is necessary to manually adjust the opening and closing of each valve, which causes inconvenience to the automated detection of gases. The piston valve assembly adopted in this solution controls the on-off of the gas sample path that is respectively connected to the gas sample interface and the sampling gas path to uniformly control the on-off of the gas path. Then, after the gas to be measured in the gas pipeline enters the gas detection sensor through the gas sample interface, the parameters of the gas to be measured can be measured; during this process, by simply controlling whether the piston valve assembly works or not, the connection or disconnection of the sampling gas path, the gas sample path, and the gas sample interface can be controlled, without manually tightening or loosening the valve stem one by one, which is simple to operate and improves the synchronization of the on-off of the gas path.

[0011] As one implementation manner of the piston valve assembly, the piston valve assembly includes a valve seat. A slideway corresponding to the gas sample path is provided in the valve seat. The slideway is a hollow structure. A valve body is arranged in the slideway. The valve body includes a valve core. The valve core can slide in the slideway. A notch section that contracts from the outer periphery of the valve core towards the center of the valve core is provided on the valve core;

[0012] When the notch section slides to the position of the gas sample path along with the valve core, the gas sample path is connected.

[0013] As one implementation manner of the sliding of the valve core in the slideway, the valve body further includes an 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 the notch section. The valve core can be magnetically adsorbed. The two ends of the electromagnetic coil are respectively connected to the positive and negative poles of an external power supply. When the external power supply is turned on, a magnetic field can be generated inside the electromagnetic coil, and a magnetic force is generated on the end of the valve core away from the notch section, causing the valve core to move in the direction away from the notch section. At this time, the notch section leaves the position of the gas sample path, disconnecting the gas sample path.

[0014] For convenient operation, a structure needs to be set up so that the valve core can automatically reset after power-off to connect the gas sample passage, reducing manual operation, lowering the complexity of operation, and improving the degree of automation. Then, preferably, the valve body includes a housing, the electromagnetic coil is fixed inside the housing, and a spring is fixed inside the housing towards the end of the valve core away from the notch section.

[0015] When the electromagnetic coil is not powered on, that is, when the piston valve assembly is in the initial state, the spring is in the restored state, without elastic deformation and without elastic potential energy; when the electromagnetic coil is powered on, that is, when the piston valve assembly is working, the valve core moves towards the spring direction and compresses the spring to cause elastic deformation, with elastic potential energy. When the electromagnetic coil is powered off, the spring releases the elastic potential energy and pushes the valve core to the initial position.

[0016] To prevent the gas to be measured in the gas pipeline from causing too high gas flow velocity in the gas sample passage due to the action of air pressure and damaging each mechanical structure when the gas sample passage is connected, as a preferred arrangement of the gas sample passage, the gas sample passage includes an upper passage and a lower passage. There is a gap between the centerlines of the upper passage and the lower passage, and the gap matches the extension length of the notch section on the valve core; the upper passage is located vertically above the slideway, and the bottom end of the upper passage is connected to the inside of the slideway; the lower passage is located vertically below the slideway, and the top end of the lower passage is connected to the inside of the slideway.

[0017] When the gas sample passage is connected, the notch section of the valve core slides to the upper passage and the lower passage. The gas flowing out from the upper passage or the lower passage can reduce the flow velocity and gather at the notch section, and then correspondingly flow into the lower passage or the upper passage.

[0018] To prevent the gas gathered in the notch section from escaping from both ends of the notch section when the gas sample passage is connected, sealing rings are respectively arranged on the outer periphery of the valve core at both ends of the notch section, and the outer periphery of each sealing ring abuts against the inner wall of the slideway.

[0019] In the prior art, the commonly used gas detection sensor is a multi-parameter sensor. Multiple gas parameter detection units are often provided in the sensor, and each gas sample parameter detection unit requires an independent set of inlet and outlet interfaces. Then, an independent gas sample path needs to be set for each set of inlet and outlet interfaces. Preferably, the gas detection sensor has multiple gas sample interfaces; correspondingly, the piston valve assembly is provided with the same number of gas sample paths, and one end of each gas sample path is respectively used to dock with each gas sample interface; correspondingly, the sampling tube is provided with the same number of sampling gas paths as the gas sample paths, and each sampling gas path is respectively connected to the other end of the corresponding gas sample path; when the piston valve assembly is in the initial state, it can keep each gas sample path unobstructed, so that the gas to be detected can respectively pass through the corresponding sampling gas path, gas sample path and gas sample interface in sequence and enter the gas detection sensor; when the piston valve assembly works, it can make each gas sample path disconnected to prevent the gas to be detected from entering the gas detection sensor.

[0020] With such a setting, the detection gas path of each gas parameter can operate independently, so that there will be no mutual interference between each gas path.

[0021] For the above situation with multiple gas sample paths, according to the actual gas parameter types, multiple notch segments are provided on the valve core, corresponding to each gas sample interface respectively; sealing rings are sleeved on the outer periphery of the valve core at both ends of each notch segment, so that the space enclosed by each notch segment and the inner wall of the slideway is an independent and sealed space, to ensure that when each gas sample path is connected, there will be no gas leakage and cross-flow between each notch segment.

[0022] In order to be able to more independently control whether to detect a certain gas parameter, preferably, multiple slideways are provided on the valve body, and each slideway is used to communicate with the gas sample path corresponding to detecting the same gas parameter, and each slideway communicates with at least two gas sample paths corresponding to it;

[0023] Valve bodies are respectively installed in each slideway, and at least two notch segments are respectively provided on the valve cores of each valve body corresponding to their respective gas sample paths, and sealing rings are respectively sleeved on the outer periphery of the valve cores at both ends of each notch segment;

[0024] Each valve body can respectively control the corresponding valve core to slide in the corresponding slideway to realize the on-off of the gas sample path corresponding to one of the gas parameters.

[0025] As a specific arrangement mode of the sampling gas path, the gas sample interface includes an air outlet interface and an air inlet interface, and the sampling pipe includes an air guiding pipe; the air guiding pipe includes an air inlet pipe and an air outlet pipe. The end of the air inlet pipe for extending into the gas pipeline is provided with an air inlet hole, which can enable the gas to be measured inside the gas pipeline to flow into the air inlet pipe; the end of the air outlet pipe where the gas flow direction is located is provided with an air outlet hole, and the air outlet hole is communicated with the external environment where the gas pipeline is located, and is used to guide the gas in the air outlet pipe to flow out.

[0026] A second slideway is arranged on the valve seat, and the second slideway has a cylindrical hollow structure; a second valve body is slidably connected in the second slideway, and the second valve body includes a second valve core.

[0027] Fifth passage, sixth passage, seventh passage and eighth passage are correspondingly arranged on the valve seat.

[0028] Among them, the fifth passage and the seventh passage are located above the second slideway in the vertical direction, and the bottoms of the fifth passage and the seventh passage are communicated with the inside of the second slideway; the sixth passage and the eighth passage are located below the second slideway in the vertical direction, and the tops of the sixth passage and the eighth passage are communicated with the inside of the second slideway; the bottom end of the sixth passage is butted with the air outlet pipe, and the bottom end of the eighth passage is butted with the air inlet pipe; the top end of the fifth passage is butted with the air outlet interface of the gas detection sensor, and the top end of the seventh passage is butted with the air inlet interface of the gas detection sensor.

[0029] A third notch section corresponding to the fifth passage and the sixth passage is arranged on the second valve core, and the third notch section contracts radially inward from the outer periphery of the second valve core; a fourth notch section corresponding to the seventh passage and the eighth passage is arranged on the second valve core, and the fourth notch section contracts radially inward from the outer periphery of the second valve core; sealing rings are arranged at both ends of the third notch section and the fourth notch section, and the outer peripheral dimension of the sealing ring matches the inner wall dimension of the hollow structure of the second slideway.

[0030] Specifically, when the fifth passage and the sixth passage are both located in the space where the third notch section is located, the fifth passage and the sixth passage are communicated, that is, the air outlet interface of the gas parameter detection unit in the gas detection sensor is communicated with the air outlet pipe in the sampling pipe; when the seventh passage and the eighth passage are both located in the space where the fourth notch section is located, the seventh passage and the eighth passage are communicated, that is, the air inlet interface of the gas parameter detection unit in the gas detection sensor is communicated with the air inlet pipe in the sampling pipe.

[0031] A calibration gas path is also provided on the valve seat. The calibration gas path is used to introduce standard gas. The calibration gas path is provided on the side of the seventh passage away from the eighth passage, and the calibration gas path is communicated with the second slideway. A calibration exhaust port is opened at the end of the second slideway close to the fifth passage for discharging the remaining standard gas.

[0032] When the second valve body is powered off, the second valve core returns to the initial position under the action of the spring. At this time, the fifth passage is communicated with the sixth passage, and the seventh passage is communicated with the eighth passage, and the seventh passage is disconnected from the calibration gas path. When the second valve body is powered on, the second valve core moves towards the working position in the second slideway, disconnecting the fifth passage from the sixth passage and the seventh passage from the eighth passage respectively. At the same time, the seventh passage is connected to the calibration gas path to realize introducing standard gas into the seventh passage and its corresponding gas sample interface through the calibration gas path. After the standard gas is used for calibration through the gas detection sensor, the remaining standard gas returns to the second slideway through the fifth passage and is discharged through the calibration exhaust port.

[0033] The technical solution of the present utility model has the following beneficial effects: The sampling tube provided in the gas pipeline sampling device of the present utility model can realize the diversion of the gas to be measured in the gas pipeline. The provided piston valve assembly can quickly change the on-off states of multiple different detection gas paths by controlling the expansion and contraction of the valve core in the valve body. Utilizing the principle that the electromagnetic coil generates magnetic force when powered on and combining with the spring, simple on-off control of the valve core can be achieved. Then, it can be realized that by only controlling whether the piston valve assembly works or not, the sampling gas path, the gas sample path, and the gas sample interface can be connected or disconnected, without manually tightening or loosening the valve stem one by one. The operation is simple, and the synchronization of the on-off of the gas path is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to make the purpose, technical solution, and advantages of the utility model clearer, the present utility model will be further described in detail below with reference to the drawings, where:

[0035] Figure 1 is the overall structural schematic diagram of the gas pipeline sampling device of the present utility model.

[0036] Figure 2 is the structural schematic diagram of the piston valve assembly of the present utility model.

[0037] Figure 3 is the structural schematic diagram of the valve body of the present utility model.

[0038] Figure 4 is the partial sectional view of the piston valve assembly of the present utility model.

[0039] Figure 5 is the sectional view of the sampling tube of the embodiment of the present utility model.

[0040] Figure 6 Exploded view of the piston valve assembly according to an embodiment of the present utility model.

[0041] Figure 7 is Figure 6 Partial sectional view taken along line B-B in

[0042] Figure 8 is Figure 6 Partial sectional view taken along line A-A of the second valve body in the valve-in state in

[0043] Figure 9 is Figure 6 Partial sectional view taken along line A-A of the second valve body in the valve-out state in

[0044] Explanation of reference numerals: 100, gas detection sensor; 200, gas pipeline sampling device; 300, sampling pipe; 400, piston valve assembly; 401, valve seat; 402, slideway; 403, valve body; 404, valve core; 405, notch section; 406, electromagnetic coil; 407, housing; 408, spring; 409, sealing ring; 410, upper passage; 411, lower passage; 501, high-pressure differential pressure pipeline; 502, low-pressure differential pressure pipeline; 503, high-pressure pressure tapping port; 504, low-pressure pressure tapping port; 505, intake pipeline; 506, outlet pipeline; 507, temperature pipe; 601, first slideway; 602, first valve body; 603, first valve core; 604, first notch section; 605, second notch section; 606, first passage; 607, second passage; 608, third passage; 609, fourth passage; 610, second slideway; 611, second valve body; 612, second valve core; 613, third notch section; 614, fourth notch section; 615, fifth passage; 616, sixth passage; 617, seventh passage; 618, eighth passage; 619, first limiting member; 620, second limiting member; 621, calibration gas path; 622, calibration exhaust port. Detailed implementation manners

[0045] In order to better understand the purpose, structure and function of the present utility model, the following further describes in detail a gas pipeline sampling device of the present utility model with reference to the accompanying drawings.

[0046] The present utility model can be applied to the detection of gas parameters in a pipeline, and solves the technical problem that manual valves are provided on each gas path of the gas pipeline parameter sensor in the prior art, and the switching of each valve requires manually tightening and loosening the valve stem one by one, and the operation is relatively complicated.

[0047] Please refer to Figure 1, based on the above - solved technical problems, the utility model discloses a gas pipeline sampling device 200 for introducing the gas to be measured in a gas pipeline into a gas detection sensor 100 for detection. It includes a piston valve assembly 400 which is detachably installed at one end of the gas detection sensor 100 having a gas sample interface. A gas sample passage is correspondingly provided on the piston valve assembly 400, and one end of the gas sample passage is used to dock with the gas sample interface. It also includes a sampling tube 300, one end of which is used to extend into the gas pipeline to sample the flowing gas in the gas pipeline. A sampling gas path is correspondingly provided in the sampling tube 300, and the sampling gas path is connected to the other end of the gas sample passage. When the piston valve assembly 400 is in the initial state, it can keep the gas sample passage unblocked, so that the gas to be measured can enter the gas detection sensor 100 in sequence through the sampling gas path, the gas sample passage and the gas sample interface. When the piston valve assembly 400 works, it can disconnect the gas sample passage to prevent the gas to be measured from entering the gas detection sensor 100.

[0048] The working principle of this solution is as follows: When detecting the gas to be measured, the piston valve assembly 400 is in the initial state. In this way, the gas to be measured enters the gas detection sensor 100 through the sampling gas path, the gas sample passage and the gas sample interface in sequence for detection. When it is temporarily not necessary to detect the gas to be measured, the piston valve assembly 400 is made to work to prevent the gas to be measured from entering the gas detection sensor 100.

[0049] Both the connection between the sampling tube 300 and the piston valve assembly 400 and the connection between the piston valve assembly 400 and the gas detection sensor 100 are detachable. When it is no longer necessary to detect the gas to be measured or when it is necessary to repair the sampling tube 300, the piston valve assembly 400 or the gas detection sensor 100, each component can be removed, which is convenient for operation, maintenance and replacement.

[0050] Generally, the gas detection sensor 100 can detect multiple parameters simultaneously, or there are multiple gas paths corresponding to each parameter. In the prior art, usually a valve is provided for each gas path. During detection, it is necessary to manually adjust the opening and closing of each valve, which causes inconvenience to the automatic detection of gas. The piston valve assembly 400 adopted in this solution controls the on - off of the gas sample passage respectively connected to the gas sample interface and the sampling gas path to uniformly control the on - off of the gas path. After the gas to be measured in the gas pipeline enters the gas detection sensor 100 through the gas sample interface, the parameters of the gas to be measured can be measured. During this process, only by controlling whether the piston valve assembly 400 works or not, the connection or disconnection of the sampling gas path, the gas sample passage and the gas sample interface can be controlled. There is no need to manually tighten or loosen the valve stem one by one, and the operation is simple, which improves the synchronization of the on - off of the gas path.

[0051] For one implementation of the piston valve assembly 400, please refer to Figure 2 and Figure 3 , the piston valve assembly 400 includes a valve seat 401. A slideway 402 corresponding to the gas sample passage is provided in the valve seat 401. The slideway 402 is of a hollow structure. A valve body 403 is arranged in the slideway 402. The valve body 403 includes a valve core 404. The valve core 404 can slide in the slideway 402. A notch section 405 that contracts from the outer periphery of the valve core 404 towards the center of the valve core 404 is provided on the valve core 404. When the notch section 405 slides to the gas sample passage along with the valve core 404, the gas sample passage is communicated.

[0052] For one implementation of the valve core 404 sliding in the slideway 402, please refer to Figure 3 , the valve body 403 further includes an electromagnetic coil 406. The valve core 404 passes through the center of the electromagnetic coil 406, and the electromagnetic coil 406 is close to one end of the valve core 404 away from the notch section 405. The valve core 404 can be magnetically adsorbed. The two ends of the electromagnetic coil 406 are respectively connected to the positive and negative poles of an external power supply. When the external power supply is connected, a magnetic field can be generated inside the electromagnetic coil 406, and a magnetic force is generated on one end of the valve core 404 away from the notch section 405, causing the valve core 404 to move in a direction away from the notch section 405. At this time, the notch section 405 leaves the gas sample passage, disconnecting the gas sample passage.

[0053] Specifically, the valve core 404 is made of a material that can be magnetically adsorbed, such as iron.

[0054] For convenient operation, a structure needs to be set so that the valve core 404 can automatically reset to connect the gas sample passage after disconnecting the gas sample passage, reducing manual operation, lowering the complexity of the operation, and improving the degree of automation. Then, as a preference, please refer to Figure 3 , the valve body 403 includes a housing 407. The electromagnetic coil 406 is fixed inside the housing 407. A spring 408 is fixed at one end of the interior of the housing 407 facing away from the notch section 405 of the valve core 404.

[0055] Please refer to Figure 3 , when the electromagnetic coil 406 is not powered on, that is, when the piston valve assembly 400 is in the initial state, the spring 408 is in a restored state, without elastic deformation and without elastic potential energy. When the electromagnetic coil 406 is powered on, that is, when the piston valve assembly 400 is working, the valve core 404 moves towards the spring 408 and compresses the spring 408 to cause elastic deformation, with elastic potential energy. When the electromagnetic coil 406 is powered off, the spring 408 releases the elastic potential energy and pushes the valve core 404 to the initial position.

[0056] To prevent the gas velocity in the gas sample passage from being too high due to the action of air pressure when the gas sample passage is connected, which may cause damage to each mechanical structure, as an optimal arrangement of the gas sample passage, please refer to Figure 4 , the gas sample passage includes an upper passage 410 and a lower passage 411. There is a gap between the centerlines of the upper passage 410 and the lower passage 411, and the gap matches the extension length of the notch section 405 on the valve core 404; the upper passage 410 is vertically above the slideway 402, and the bottom end of the upper passage 410 is communicated with the inside of the slideway 402; the lower passage 411 is vertically below the slideway 402, and the top end of the lower passage 411 is communicated with the inside of the slideway 402.

[0057] When the gas sample passage is connected, the notch section 405 of the valve core 404 slides to the upper passage 410 and the lower passage 411. The gas flowing out of the upper passage 410 or the lower passage 411 can reduce the flow velocity and converge at the notch section 405, and then correspondingly flow into the lower passage 411 or the upper passage 410.

[0058] To prevent the gas collected in the notch section 405 from escaping from both ends of the notch section 405 when the gas sample passage is connected, please refer to Figure 3 and Figure 4 , sealing rings 409 are respectively arranged on the outer periphery of the valve core 404 at both ends of the notch section 405, and the outer periphery of each sealing ring 409 abuts against the inner wall of the slideway 402.

[0059] The commonly used gas detection sensor 100 in the prior art is a multi-parameter sensor. Multiple gas parameter detection units are often set in the sensor, and each gas sample parameter detection unit requires an independent set of air inlet and outlet interfaces. Then, an independent gas sample passage needs to be set for each set of air inlet and outlet interfaces. As an option, the gas detection sensor 100 has multiple gas sample interfaces; the piston valve assembly 400 is correspondingly provided with the same number of gas sample passages, and one end of each gas sample passage is respectively used to dock with each gas sample interface; the sampling tube 300 is correspondingly provided with the same number of sampling gas paths as the number of gas sample passages, and each sampling gas path is respectively communicated with the other end of the corresponding gas sample passage; when the piston valve assembly 400 is in the initial state, it can keep each gas sample passage unblocked, so that the gas to be detected can respectively pass through the corresponding sampling gas path, gas sample passage and gas sample interface and enter the gas detection sensor 100 in sequence; when the piston valve assembly 400 works, it can disconnect each gas sample passage to prevent the gas to be detected from entering the gas detection sensor 100.

[0060] With such a setting, the detection gas paths of each gas parameter can operate independently, preventing interference between the gas paths. This solves the technical problem in the prior art that there are many valves in the gas pipeline parameter sensor, and the switching of each valve requires manually tightening or loosening the valve stem one by one, which is a complex operation and results in poor synchronization of valve stem tightening and loosening.

[0061] For the above situation with multiple gas sample paths, according to the actual gas parameter types, please refer to Figure 3 , multiple notch segments 405 are provided on the valve core 404, corresponding to each gas sample interface respectively; sealing rings 409 are sleeved on the outer periphery of the valve core 404 at both ends of each notch segment 405, so that the space enclosed by each notch segment 405 and the inner wall of the slideway 402 is an independent and sealed space, ensuring that when each gas sample path is connected, gas leakage and cross-flow do not occur between each notch segment 405.

[0062] To be able to more independently control whether to detect a certain gas parameter, as an option, please refer to the embodiment. Multiple slideways 402 are provided on the valve body 403, and each slideway 402 is used to communicate with the gas sample path corresponding to detecting the same gas parameter. Each slideway 402 communicates with at least two gas sample paths corresponding to it;

[0063] Valve bodies 403 are respectively installed in each slideway 402, and at least two notch segments 405 are respectively provided on the valve cores 404 of each valve body 403 corresponding to their respective gas sample paths. Sealing rings 409 are respectively sleeved on the outer periphery of the valve cores 404 at both ends of each of the notch segments 405;

[0064] Each of the valve bodies 403 can respectively control the corresponding valve core 404 to slide in the corresponding slideway 402 to realize the on-off of the gas sample path corresponding to one of the gas parameters.

[0065] In the prior art, at least two gas sample interfaces are provided for each gas parameter. Correspondingly, at least two gas sample paths are respectively provided on the valve seat 401 for the gas sample interfaces for detecting the same gas parameter; then when each valve body 403 corresponding to each slideway 402 is controlled, it can independently control whether each gas parameter is detected, increasing the flexibility of sampling;

[0066] In specific implementation, if unified management is required for detecting different gas parameters, then it can be transformed into unified management of each valve body 403, that is, the electromagnetic coils 406 of each valve body 403 are controlled to be energized or de-energized uniformly by a management circuit, which can unify the valve-in or valve-out actions of each valve body 403, and further realize the unified management of multi-parameter detection sampling.

[0067] The gas pipeline sampling device disclosed by the present utility model has the following technical effects:

[0068] 1. In the gas pipeline sampling device of the present utility model, the sampling tube provided can realize the diversion of the gas to be measured in the gas pipeline. The piston valve assembly can quickly change the on-off of multiple different detection gas paths by controlling the expansion and contraction of the valve core in the valve body. Using the principle that the electromagnetic coil generates magnetic force when electrified and combining with the spring, simple on-off control of the valve core can be achieved. Then, it can be realized that by only controlling the operation of the piston valve assembly, the sampling gas path, the gas sample path, and the gas sample interface can be connected or disconnected, without manually tightening or loosening the valve stem one by one, with simple operation, and the synchronization of the on-off of the gas path is improved.

[0069] 2. The connection between the sampling tube and the piston valve assembly, and between the piston valve assembly and the gas detection sensor in the gas pipeline sampling device of the present utility model are all detachable connections. When it is no longer necessary to detect the gas to be measured or when it is necessary to repair the sampling tube, the piston valve assembly, or the gas detection sensor, each component can be removed, with convenient operation, repair, and replacement.

[0070] 3. The gas pipeline sampling device of the present utility model has a simple structure and convenient operation, can realize the rapid and accurate control of the gas path, and at the same time is convenient for disassembly and repair, and has a wide application prospect.

[0071] In order to further elaborate the structure of the present utility model, the following application embodiments are disclosed by the present utility model.

[0072] Please refer to Figures 5 to 9 , this embodiment discloses a gas pipeline sampling device 200 for introducing the gas to be measured in the gas pipeline into the gas detection sensor for detection, including a sampling tube 300 and a piston valve assembly 400; the piston valve assembly 400 is used for detachably installing at one end of the gas detection sensor with a gas sample interface, and the gas sample interface includes a low-pressure interface, a high-pressure interface, an air outlet interface, and an air inlet interface; the sampling tube 300 is detachably connected to the piston valve assembly 400.

[0073] Specifically, the sampling tube 300 is used for inserting into the gas pipeline, forming a differential pressure through the air flow to realize the collection of the gas sample. The sampling tube 300 includes a differential pressure pipeline and an air guiding pipeline; the differential pressure pipeline and the air guiding pipeline can respectively divert the gas for the gas probe to detect, realizing the sampling of the gas and the detection of the gas flow rate, gas concentration, and differential pressure.

[0074] Please refer to Figure 5, the differential pressure pipeline includes a high-pressure differential pressure pipeline 501 and a low-pressure differential pressure pipeline 502. The ends of the high-pressure differential pressure pipeline 501 and the low-pressure differential pressure pipeline 502 for extending into the gas pipeline are respectively provided with a high-pressure pressure tapping port 503 and a low-pressure pressure tapping port 504; the gas guiding pipeline includes an air inlet pipeline 505 and an air outlet pipeline 506. The end of the air inlet pipeline 505 for extending into the gas pipeline is provided with an air inlet hole, which can enable the gas to be measured inside the gas pipeline to flow into the air inlet pipeline 505; an air outlet hole is provided at the gas flow end of the air outlet pipeline 506, and the air outlet hole is communicated with the external environment where the gas pipeline is located, and is used to guide the gas in the air outlet pipeline 506 to flow out.

[0075] Specifically, please refer to Figure 5 , a temperature pipe 507 is further arranged in the sampling pipe 300 and is arranged in the air inlet pipeline 505. When the flowing gas in the gas pipeline enters the air inlet pipeline 505, it can contact the temperature pipe 507 and is used to detect the gas temperature.

[0076] Specifically, the temperature pipe 507 is a blind pipe, and a PT100 platinum resistance with a suitable size is installed in the blind pipe, and the temperature is detected when the air flow passes through the air inlet side.

[0077] Please refer to Figure 6 , the piston valve assembly 400 includes a valve seat 401. A first slideway 601 and a second slideway 610 are arranged on the valve seat 401, and the first slideway 601 and the second slideway 610 respectively have a hollow structure; the hollow structures of the first slideway 601 and the second slideway 610 are both cylindrical; the first slideway 601 and the second slideway 610 are arranged in parallel;

[0078] Please refer to Figure 7 , corresponding to the differential pressure pipeline, the valve seat 401 is correspondingly provided with a first passage 606, a second passage 607, a third passage 608 and a fourth passage 609 which are arranged in parallel; among them, the first passage 606 and the third passage 608 are located above the first slideway 601 in the vertical direction, and the bottoms of the first passage 606 and the third passage 608 are communicated with the inside of the first slideway 601; the second passage 607 and the fourth passage 609 are located below the first slideway 601 in the vertical direction, and the tops of the second passage 607 and the fourth passage 609 are communicated with the inside of the first slideway 601; the bottom end of the second passage 607 is docked with the low-pressure differential pressure pipeline 502, and the bottom end of the fourth passage 609 is docked with the high-pressure differential pressure pipeline 501; the top end of the first passage 606 is docked with the low-pressure interface of the differential pressure detection unit in the gas detection sensor, and the top end of the third passage 608 is docked with the high-pressure interface of the differential pressure detection unit in the gas detection sensor.

[0079] Please refer to Figure 6 and Figure 7, a first valve body 602 is slidably connected in the first slideway 601, and the first valve body 602 adopts an electronically controlled magnetization valve. The first valve body 602 includes a first valve core 603, a first electromagnetic coil and a first housing; a first notch section 604 corresponding to the first passage 606 and the second passage 607 is provided on the first valve core 603, and the first notch section 604 radially contracts inward from the outer periphery of the first valve core 603; a second notch section 605 corresponding to the third passage 608 and the fourth passage 609 is provided on the first valve core 603, and the second notch section 605 radially contracts inward from the outer periphery of the first valve core 603; sealing rings 409 are respectively provided at both ends of the first notch section 604 and the second notch section 605, and the outer peripheral dimension of the sealing ring 409 matches the inner wall dimension of the hollow structure of the first slideway 601; the first electromagnetic coil is fixed in the first housing, and a first spring is fixed at one end of the first housing facing away from the first notch section 604 and the second notch section 605 of the first valve core 603. The first valve core 603 passes through the center of the electromagnetic coil, and the first electromagnetic coil is close to one end of the first valve core 603 away from the first notch section 604 and the second notch section 605. The first valve core 603 can be magnetically adsorbed, and the two ends of the first electromagnetic coil are respectively connected to the positive and negative poles of an external power supply; when the first valve body 602 is in the initial position, the first passage 606 and the second passage 607 are communicated, and the third passage 608 and the fourth passage 609 are communicated; when the external power supply is connected, a magnetic field can be generated inside the first electromagnetic coil, and a magnetic force is generated on one end of the first valve core 603 away from the first notch section 604 and the second notch section 605, so that the first valve core 603 moves in a direction away from the first notch section 604 and the second notch section 605. At this time, the first notch section 604 and the second notch section 605 leave the first passage 606 and the second passage 607, and the third passage 608 and the fourth passage 609, so that the first passage 606 is disconnected from the second passage 607, and the third passage 608 is disconnected from the fourth passage 609.

[0080] Specifically, the material of the first valve core 603 is iron.

[0081] Detection principle corresponding to the differential pressure pipeline: When the first passage 606 and the second passage 607 are both located in the space where the first notch section 604 is located, the first passage 606 and the second passage 607 are connected, that is, the low-pressure interface of the differential pressure detection unit in the gas detection sensor is connected to the low-pressure differential pressure pipeline 502 in the sampling pipe 300; when the third passage 608 and the fourth passage 609 are both located in the space where the second notch section 605 is located, the third passage 608 and the fourth passage 609 are connected, that is, the high-pressure interface of the differential pressure detection unit in the gas detection sensor is connected to the high-pressure differential pressure pipeline 501 in the sampling pipe 300. When the first valve body 602 is in the initial state, it can respectively keep the first passage 606 and the second passage 607, and the third passage 608 and the fourth passage 609 unblocked, so that the gas to be measured can sequentially pass through the differential pressure pipeline, the first passage 606 and the second passage 607, the third passage 608 and the fourth passage 609, and the corresponding gas sample interfaces into the gas differential pressure detection unit in the gas detection sensor for detecting the gas differential pressure; when the first valve body 602 is working, it can respectively disconnect the first passage 606 and the second passage 607, and the third passage 608 and the fourth passage 609 to prevent the gas to be measured from entering the gas detection sensor. At the same time, the second notch section 605 moves to the first passage 606 and the third passage 608 to connect the first passage 606 and the third passage 608, so as to balance the air pressure in the differential pressure detection gas path on the side close to the gas detection sensor.

[0082] Please refer to Figure 6 and Figure 8 For the air extraction pipeline, the valve seat 401 is correspondingly provided with a fifth passage 615, a sixth passage 616, a seventh passage 617 and an eighth passage 618 arranged in parallel; among them, the fifth passage 615 and the seventh passage 617 are located above the second slideway 610 in the vertical direction, and the bottoms of the fifth passage 615 and the seventh passage 617 are connected to the inside of the second slideway 610; the sixth passage 616 and the eighth passage 618 are located below the second slideway 610 in the vertical direction, and the tops of the sixth passage 616 and the eighth passage 618 are connected to the inside of the second slideway 610; the bottom of the sixth passage 616 is butted against the air outlet pipeline 506, and the bottom of the eighth passage 618 is butted against the air inlet pipeline 505; the top of the fifth passage 615 is butted against the air outlet interface of the gas parameter detection unit in the gas detection sensor, and the top of the seventh passage 617 is butted against the air inlet interface of the gas parameter detection unit in the gas detection sensor.

[0083] Please refer to Figure 6 and Figure 8, a second valve body 611 is slidably connected in the second slideway 610, and the second valve body 611 adopts an electrically controlled magnetizing valve. The second valve body 611 includes a second valve core 612, a second electromagnetic coil and a second outer shell; a third notch section 613 corresponding to the fifth passage 615 and the sixth passage 616 is arranged on the second valve core 612, and the third notch section 613 radially contracts inwards from the outer periphery of the second valve core 612; a fourth notch section 614 corresponding to the seventh passage 617 and the eighth passage 618 is arranged on the second valve core 612, and the fourth notch section 614 radially contracts inwards from the outer periphery of the second valve core 612; sealing rings 409 are arranged at both ends of the third notch section 613 and the fourth notch section 614, and the outer peripheral dimension of the sealing ring 409 matches the inner wall dimension of the hollow structure of the second slideway 610; the second electromagnetic coil is fixed in the second outer shell, and a second spring is fixed at one end of the second outer shell facing away from the third notch section 613 and the fourth notch section 614 of the second valve core 612. The second valve core 612 passes through the center of the electromagnetic coil, and the second electromagnetic coil is close to one end of the second valve core 612 away from the third notch section 613 and the fourth notch section 614. The second valve core 612 can be magnetically adsorbed, and both ends of the second electromagnetic coil are respectively connected to the positive and negative electrodes of an external power supply; when the second valve body 611 is in the initial position, the fifth passage 615 and the sixth passage 616 are communicated, and the seventh passage 617 and the eighth passage 618 are communicated; when the external power supply is connected, a magnetic field can be generated inside the second electromagnetic coil, and a magnetic force is generated on one end of the second valve core 612 away from the third notch section 613 and the fourth notch section 614, so that the second valve core 612 moves in a direction away from the third notch section 613 and the fourth notch section 614. At this time, the third notch section 613 and the fourth notch section 614 leave the fifth passage 615 and the sixth passage 616, and the seventh passage 617 and the eighth passage 618, and the fifth passage 615 and the sixth passage 616, and the seventh passage 617 and the eighth passage 618 are disconnected.

[0084] Specifically, the material of the second valve core 612 is iron.

[0085] Detection principle corresponding to the air inlet pipeline: When the fifth passage 615 and the sixth passage 616 are both located in the space where the third notch section 613 is located, the fifth passage 615 and the sixth passage 616 are communicated, that is, the air outlet interface of the gas parameter detection unit in the gas detection sensor is communicated with the air outlet pipeline 506 in the sampling tube 300; when the seventh passage 617 and the eighth passage 618 are both located in the space where the fourth notch section 614 is located, the seventh passage 617 and the eighth passage 618 are communicated, that is, the air inlet interface of the gas parameter detection unit in the gas detection sensor is communicated with the air inlet pipeline 505 in the sampling tube 300.

[0086] Please refer toFigure 8 When the second valve body 611 is in the initial state, it can disconnect the fifth passage 615 from the sixth passage 616 and the seventh passage 617 from the eighth passage 618 respectively, preventing the gas to be measured from entering the gas detection sensor;

[0087] Please refer to Figure 9 When the second valve body 611 is working, it can keep the fifth passage 615 and the sixth passage 616, and the seventh passage 617 and the eighth passage 618 unblocked respectively, enabling the gas to be measured to pass through the gas guiding pipeline, the fifth passage 615 and the sixth passage 616, the seventh passage 617 and the eighth passage 618, and the corresponding gas sample interfaces in sequence and enter the gas multi-parameter detection unit in the gas detection sensor for detecting gas parameters.

[0088] Specifically, the detection types of the gas parameters corresponding to the gas guiding pipeline include gas flow and gas concentration.

[0089] Specifically, at the ends of the first valve core 603 and the second valve core 612 facing the inner sides of the first slideway 601 and the second slideway 610 respectively, a first limiting member 619 and a second limiting member 620 are respectively arranged for limiting the movement of the first valve core 603 and the second valve core 612. The limiting members are used to control the movement range of the valve cores to ensure that they move within a safe working range.

[0090] Specifically, the first limiting member 619 and the second limiting member 620 are respectively provided with hand-pulling members, and the hand-pulling members can be manually pulled to make the first limiting member 619 and the second limiting member 620 drive the first valve core 603 and the second valve core 612 to reach the limiting positions respectively, so as to manually open or close each gas path.

[0091] Specifically, the material of the sealing ring 409 is preferably fluororubber to achieve a good sealing effect.

[0092] Specifically, the piston valve assembly 400 is detachably connected with a connecting block, and the connecting block can be detachably installed at the sensing end of the sensor, which is convenient for disassembly, maintenance and replacement.

[0093] Please refer to the figure, please refer to Figure 6 、 Figure 8 and Figure 9 On the valve seat 401, a calibration gas path 621 is further provided, and the calibration gas path 621 is used for introducing standard gas; the calibration gas path 621 is arranged on the side of the seventh passage 617 away from the eighth passage 618, and the calibration gas path 621 is communicated with the second slideway 610. A calibration exhaust port 622 is opened at the end of the second slideway 610 close to the fifth passage 615 for discharging the remaining standard gas.

[0094] Please refer to Figure 8 When the second valve body 611 is de-energized, the second valve core 612 returns to its initial position under the action of the spring. At this time, the fifth passage 615 communicates with the sixth passage 616, and the seventh passage 617 communicates with the eighth passage 618, and the seventh passage 617 is disconnected from the calibration gas path 621.

[0095] Please refer to Figure 9 When the second valve body 611 is energized, the second valve core 612 moves towards the working position in the second slideway 610, disconnecting the fifth passage 615 from the sixth passage 616 and the seventh passage 617 from the eighth passage 618 respectively. At the same time, the seventh passage 617 is connected to the calibration gas path 621, so as to realize introducing standard gas into the seventh passage 617 and its corresponding gas sample interface through the calibration gas path 621. After the standard gas is used for calibration through the gas detection sensor, the remaining standard gas returns to the second slideway through the fifth passage 615 and is discharged through the calibration exhaust port 622.

[0096] The working process of this embodiment is as follows: First, insert the sampling tube 300 into the gas pipeline and install it firmly; then, introduce flowing gas into the gas pipeline; then, when measuring the gas differential pressure, make the first valve body 602 de-energized. At this time, the first valve core 603 is in the valve-in state, and the first passage 606 and the second passage 607, the third passage 608 and the fourth passage 609 on the first valve body 602 are connected and respectively communicate with the corresponding low-pressure differential pressure pipeline 502 and high-pressure differential pressure pipeline 501 in the sampling tube 300. The flowing gas in the gas pipeline enters the low-pressure and high-pressure differential pressure pipelines respectively to form two pressure columns. After passing through the corresponding passages on the piston valve assembly 400, they enter the differential pressure detection module of the gas detection sensor for gas differential pressure detection;

[0097] When the gas differential pressure does not need to be measured, make the first valve body 602 energized. The electromagnetic coil in the first valve body 602 drives the first valve core 603 to be in the valve-out state. At this time, the first notch section 604 and the second notch section 605 on the first valve body 602 are disconnected from the first passage 606 and the second passage 607, and the third passage 608 and the fourth passage 609 respectively, that is, the low-pressure differential pressure pipeline and the high-pressure differential pressure pipeline can be disconnected to stop the gas differential pressure detection;

[0098] When measuring gas parameters, the second valve body 611 is powered off, and the second valve core 612 is in the valve-in state. The fifth passage 615 and the sixth passage 616, the seventh passage 617 and the eighth passage 618 on the second valve body 611 are connected, and are respectively connected to the corresponding outlet gas pipeline 506 and the inlet gas pipeline 505 in the sampling pipe 300. The flowing gas in the gas pipeline respectively flows through the inlet gas pipeline 505, and the seventh passage 617 and the eighth passage 618 to the gas parameter detection module in the gas detection sensor. The remaining gas after detection enters the outlet gas pipeline 506 of the sampling pipe 300 through the fifth passage 615 and the sixth passage 616, and is discharged into the external environment;

[0099] When calibrating the gas detection sensor, the second valve body 611 is powered on. At this time, the electromagnetic coil in the second valve body 611 drives the second valve core 612 to be in the valve-out state. At this time, the fifth passage 615 and the sixth passage 616, the seventh passage 617 and the eighth passage 618 on the second valve body 611 are respectively disconnected from the outlet gas pipeline 506 and the inlet gas pipeline 505. At the same time, the calibration gas path 621 is connected to the seventh passage 617. A standard gas is introduced into the calibration gas path 621 to calibrate the gas parameter detection module of the gas detection sensor. After the standard gas is used for calibration after passing through the gas detection sensor, the remaining standard gas returns to the second slideway through the fifth passage 615 and is discharged through the calibration exhaust port 622; After the calibration is completed, the power supply of the second valve body 611 is disconnected, and the second valve body 611 returns to the valve-in state again, so that the fifth passage 615 and the sixth passage 616, the seventh passage 617 and the eighth passage 618 are respectively connected to the outlet gas pipeline 506 and the inlet gas pipeline 505, and the gas in the gas pipeline can continue to be drained and detected.

[0100] The piston valve assembly of this embodiment can be controlled electrically or manually, and can realize automatic electric control or manual rapid pushing and pulling of the piston valve assembly, so that the valve core in the valve body can be telescoped to quickly change the on-off of multiple different detection gas paths. Moreover, an electromagnetic coil is adopted to enable simple on-off control of the valve core. By simply controlling whether the piston valve assembly works or not, the sampling gas path, the gas sample path, and the gas sample interface can be connected or disconnected, without manually tightening or loosening the valve stem one by one. The operation is simple, and the on-off synchronization of the gas path is improved.

[0101] It can be understood that the present utility model is described through some specific embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present utility model, various changes or equivalent substitutions can be made to these features and specific embodiments. Under the teaching of the present utility model, these features and specific embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. The specific embodiments described in the present utility model are a part of the specific embodiments of the present utility model, rather than all of the specific embodiments. Generally, the components of the specific embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the specific embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected specific embodiments of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein. Based on the specific embodiments in the present utility model, all other specific embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

Claims

1. A gas pipeline sampling device for introducing a gas to be measured in a gas pipeline into a gas detection sensor for detection, characterized in that, It includes a piston valve assembly which is used for detachably installing at one end of the gas detection sensor with a gas sample interface. A gas sample passage is correspondingly arranged on the piston valve assembly, and one end of the gas sample passage is used for docking with the gas sample interface. It also includes a sampling tube, one end of which is used for extending into the gas pipeline to sample the flowing gas in the gas pipeline. A sampling gas path is correspondingly arranged in the sampling tube, and the sampling gas path is connected to the other end of the gas sample passage. When the piston valve assembly is in the initial state, it can keep the gas sample passage unblocked, so that the gas to be measured can enter the gas detection sensor in sequence through the sampling gas path, the gas sample passage and the gas sample interface. When the piston valve assembly works, it can disconnect the gas sample passage to prevent the gas to be measured from entering the gas detection sensor.

2. The gas pipeline sampling device according to claim 1, wherein The piston valve assembly includes a valve seat. A slideway corresponding to the gas sample passage is arranged in the valve seat. The slideway is a hollow structure, and a valve body is arranged in the slideway. The valve body includes a valve core which can slide in the slideway. A notch section that contracts from the outer periphery of the valve core towards the center of the valve core is provided on the valve core. When the notch section slides to the gas sample passage along with the valve core, the gas sample passage is connected.

3. The gas pipeline sampling device according to claim 2, characterized in that, The valve body also includes an 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 the notch section. The valve core can be magnetically adsorbed. The two ends of the electromagnetic coil are respectively connected to the positive and negative poles of an external power supply. When the external power supply is connected, a magnetic field can be generated inside the electromagnetic coil, and a magnetic force is generated on the end of the valve core away from the notch section, causing the valve core to move in the direction away from the notch section. At this time, the notch section leaves the gas sample passage, disconnecting the gas sample passage.

4. The gas pipeline sampling device according to claim 3, characterized in that, The valve body includes a housing. The electromagnetic coil is fixed inside the housing, and a spring is fixed at the end of the housing interior towards the end of the valve core away from the notch section.

5. The gas pipeline sampling device according to claim 4, characterized in that, The gas sample passage includes an upper passage and a lower passage. There is a gap between the centerlines of the upper passage and the lower passage, and the gap matches the extension length of the notch section on the valve core. The upper passage is located above the slideway vertically, and the bottom end of the upper passage is communicated with the inside of the slideway. The lower passage is located below the slideway vertically, and the top end of the lower passage is communicated with the inside of the slideway.

6. The gas pipeline sampling device according to claim 5, wherein Sealing rings are respectively arranged on the outer periphery of the valve core at both ends of the notch section, and the outer periphery of each sealing ring abuts against the inner wall of the slideway.

7. The gas pipeline sampling device according to claim 2, wherein, The gas detection sensor has a plurality of gas sample interfaces; correspondingly, the piston valve assembly is provided with the same number of gas sample passages, and one end of each of the gas sample passages is respectively used for docking with each of the gas sample interfaces; correspondingly, the sampling tube is provided with the same number of sampling gas paths as the number of gas sample passages, and each of the sampling gas paths is connected to the other end of the corresponding gas sample passage; when the piston valve assembly is in the initial state, it can keep each of the gas sample passages unblocked, so that the gas to be detected can respectively enter the gas detection sensor through the corresponding sampling gas path, gas sample passage and gas sample interface in sequence; when the piston valve assembly works, it can disconnect each of the gas sample passages to prevent the gas to be detected from entering the gas detection sensor.

8. The gas pipeline sampling device according to claim 7, characterized in that A plurality of notch segments are provided on the valve core, corresponding to each of the gas sample interfaces; sealing rings are sleeved on the outer periphery of the valve core at both ends of each notch segment.

9. The gas pipeline sampling device according to claim 7, characterized in that A plurality of slideways are provided on the valve body, and each slideway is used for communicating with the gas sample passage correspondingly arranged for detecting the same gas parameter, and there are at least two gas sample passages communicated with each slideway; valve bodies are respectively installed in each of the slideways, and at least two notch segments are respectively arranged on the valve cores of each valve body corresponding to their respective gas sample passages, and sealing rings are respectively sleeved on the outer periphery of the valve cores at both ends of each of the notch segments.

10. The gas pipeline sampling device according to claim 6, wherein, The gas sample interface includes an air outlet interface and an air inlet interface, and the sampling tube includes an air guiding pipeline; the air guiding pipeline includes an air inlet pipeline and an air outlet pipeline, and an air inlet hole is opened at one end of the air inlet pipeline for extending into the gas pipeline, so that the gas to be detected inside the gas pipeline can flow into the air inlet pipeline; an air outlet hole is opened at the gas flow end of the air outlet pipeline, and the air outlet hole is communicated with the external environment where the gas pipeline is located for guiding the gas in the air outlet pipeline to flow out. A second slideway is provided on the valve seat, and the second slideway has a cylindrical hollow structure; a second valve body is slidably connected in the second slideway, and the second valve body includes a second valve core. Fifth passage, sixth passage, seventh passage and eighth passage are correspondingly opened on the valve seat. Among them, the fifth passage and the seventh passage are located above the second slideway in the vertical direction, and the bottoms of the fifth passage and the seventh passage are communicated with the inside of the second slideway; the sixth passage and the eighth passage are located below the second slideway in the vertical direction, and the tops of the sixth passage and the eighth passage are communicated with the inside of the second slideway; the bottom end of the sixth passage is docked with the air outlet pipeline, and the bottom end of the eighth passage is docked with the air inlet pipeline; the top end of the fifth passage is docked with the air outlet interface of the gas detection sensor, and the top end of the seventh passage is docked with the air inlet interface of the gas detection sensor. A third notch section corresponding to the fifth passage and the sixth passage is provided on the second valve core, and the third notch section radially contracts inward from the outer periphery of the second valve core; a fourth notch section corresponding to the seventh passage and the eighth passage is provided on the second valve core, and the fourth notch section radially contracts inward from the outer periphery of the second valve core; sealing rings are respectively provided at both ends of the third notch section and the fourth notch section, and the outer peripheral dimension of the sealing ring matches the inner wall dimension of the hollow structure of the second slideway; A calibration gas path is further provided on the valve seat, and the calibration gas path is used for introducing a standard gas; the calibration gas path is arranged on the side of the seventh passage away from the eighth passage, and the calibration gas path is communicated with the second slideway. A calibration exhaust port is opened at the end of the second slideway close to the fifth passage for discharging the remaining standard gas.

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