Polluted gas detection device and detection method

Abstract

The application discloses a kind of polluted gas detection device and detection method, it is related to polluted gas detection technical field.This device is provided with double-layer sandwich circulation structure, by driving assembly, pumping and pressing assembly and circulation assembly cooperation, can be used in the form of continuous circulation airflow in the sampling tube outside sandwich before detection by downhole homologous high humidity gas, sample tube wall is adapted to pretreatment, make sample tube wall temperature and downhole gas temperature keep consistent, inhibit the liquefaction condensation phenomenon of water vapor in pipeline from root, avoid water-soluble pollution gas such as hydrogen sulfide, ammonia, formaldehyde, VOC because of concentration loss produced by dissolving in condensate, substantially improve the accuracy of downhole pollution gas detection, simultaneously, this device realizes gas circulation operation and synchronous linkage of knocking water removal action by linkage assembly, can real-time shake and take away the condensed water of condensation in inner wall of sandwich, effectively avoid the problem that sandwich water accumulation affects constant-temperature heat exchange effect, dissolves pollution gas, guarantee pipeline airflow unobstructed, detection condition is stable.

Description

Technical Field

[0001] This invention relates to the field of pollutant gas detection technology, specifically to a pollutant gas detection device and detection method. Background Technology

[0002] Municipal sewage wells, septic tanks, underground pipe networks and other underground spaces are in a high-humidity environment all year round, and water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs tend to accumulate inside. In the fields of environmental protection and safe production, pump suction hose type pollutant gas detection devices are often used to sample and detect the gas in the well. Existing detection equipment generally consists of a handheld tester with a single sampling hose. The sampling tube is lowered into the well, and the gas in the well is extracted by the built-in air pump and sent to the detection element to complete the concentration analysis. However, there are many technical defects that are difficult to solve under the condition of large temperature difference between the inside and outside of the well. First, when the constant-temperature saturated wet flue gas from the well is transported to the low-temperature environment on the ground through a single-layer sampling pipe, the pipe wall temperature drops rapidly below the water vapor dew point. A large amount of water vapor inside the pipe liquefies to form condensate. Pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs are all water-soluble. The gases continue to dissolve in the condensate during pipeline transportation. The gas concentration that reaches the testing instrument is much lower than the actual concentration in the well, which can easily lead to problems such as low detection values ​​and missed detections of exceeding the standard. Secondly, the condensate that precipitates on the inner wall of the pipeline is prone to adhering to and accumulating on the pipe wall and in low-lying areas of the pipeline. Long-term accumulation will block the sampling pipeline, causing a decrease in the gas extraction flow and a lag in the sampling response. The condensate can also flow back into the handheld tester with the airflow, corroding the detection sensor and shortening the service life of the equipment. Therefore, we propose a polluted gas detection device and detection method. Summary of the Invention

[0003] The purpose of this invention is to provide a pollutant gas detection device and detection method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a polluted gas detection device, comprising a handheld tester and a connecting sleeve, wherein an installation tube is fixed to the inner side of the connecting sleeve, an air inlet is provided on the handheld tester, one end of the installation tube is detachably installed to the air inlet via a thread, the handheld tester is internally provided with a pump for assisting air intake drive and a detection component for air intake detection, and a sampling tube for insertion into a well for gas extraction is fixed to the other end of the installation tube, further comprising: A pretreatment component, disposed on the outside of the sampling tube, is used to perform temperature adaptation treatment on the outside of the sampling tube before sampling of polluted gas. The pretreatment component includes a piston cylinder sleeved and fixed to the outside of the connecting sleeve. A circulation component, mounted on a piston cylinder, is used to pre-extract some of the gas in the well and subsequently return it to the well. The piston cylinder is equipped with a pumping and pressing component for auxiliary circulation and a driving component for auxiliary pumping and pressing. Through the cooperation of the pretreatment component, circulation component, pumping and pressing component, some of the gas in the well is extracted and returned to the well. During the gas circulation process, the sampling tube is subjected to adaptive temperature treatment to avoid liquefaction and condensation inside the sampling tube due to the large temperature difference between the inside and outside of the well during detection. Additionally, a striking component is provided on the outside of the piston cylinder for striking the outside of the circulation assembly. A linkage component for auxiliary linkage is provided between the drive assembly and the striking component. The linkage component and the striking component separate the condensate generated on the circulation assembly during the gas circulation process.

[0005] Preferably, the pretreatment assembly further includes a flow tube and a reflux cylinder sleeved on the outside of the sampling tube. One end of the flow tube and the reflux cylinder is fixed to one end of the piston cylinder. The flow tube is located between the sampling tube and the reflux cylinder. The inner side of the flow tube and the outer side of the sampling tube form an annular inlet channel. The inner side of the reflux cylinder and the outer side of the flow tube form an annular reflux channel. The lengths of the flow tube and the reflux cylinder are connected and are less than the length of the sampling tube.

[0006] Preferably, the circulation assembly includes multiple sets of first one-way valves arranged in a ring array fixed to the end of the piston cylinder. The first one-way valves are directed from the inlet channel to the inside of the piston cylinder. Multiple sets of second one-way valves arranged in a ring array are fixed to the end of the piston cylinder. The second one-way valves are directed from the inside of the piston cylinder to the return channel. A piston plate is slidably connected inside the piston cylinder. A sealing ring is sleeved on the outer side of the piston plate for sealing against the inner wall of the piston cylinder.

[0007] Preferably, the pumping assembly includes a drive ring sleeved on the outside of the mounting tube, the drive ring being located between the piston cylinder and the connecting sleeve, and multiple sets of mounting rods arranged in a ring array being slidably connected to the piston cylinder, with both ends of each set of mounting rods being fixed to the drive ring and the piston plate, respectively.

[0008] Preferably, the drive assembly is used to perform axial reciprocating motion of the drive ring. The drive assembly includes a U-shaped frame fixed to the connecting sleeve, a threaded rod rotatably connected to the U-shaped frame, a threaded tube threadedly engaged with the threaded rod, a fixing plate fixed to one side of the drive ring, one end of the threaded tube fixed to the fixing plate, a drive motor for driving the threaded rod mounted on the U-shaped frame, and a guide assembly for guiding during the driving process provided between the U-shaped frame and the fixing plate.

[0009] Preferably, the guide assembly includes two sets of slide rods fixed on the U-shaped frame, and the two sets of slide rods are symmetrically arranged on both sides of the threaded rod. A sleeve is slidably connected to the slide rod, and one end of the sleeve is fixed to the fixing plate.

[0010] Preferably, multiple sets of the striking components are arranged in a circular array on the outside of the piston cylinder. The striking components are used to strike the outside of the return cylinder. The striking components include a connecting plate, and a sliding component for assisting sliding connection is provided between the connecting plate and the return cylinder. A striking rod for assisting striking is fixed on the side of the connecting plate facing the return cylinder.

[0011] Preferably, the sliding assembly includes multiple sets of sliding holes formed on the connecting plate, and a T-shaped rod is slidably connected to the sliding holes, with one end of the T-shaped rod fixed to the outer side of the piston cylinder.

[0012] Preferably, the linkage component includes a transmission plate fixed to the connecting plate, the transmission plate having an inclined groove, a transmission pin slidably connected to the inclined groove, a linkage frame fixed to the drive ring, and the transmission pin fixed to the linkage frame.

[0013] A method for detecting polluting gases includes the following steps: S1: Before testing the contaminated gas in the well, thread one end of the installation pipe onto the air inlet of the handheld tester and tighten it to secure it. S2: Before sampling, the drive ring is driven to reciprocate along the axial direction of the sampling tube through transmission. During the movement of the drive ring, the piston plate is driven to reciprocate axially inside the piston cylinder through the connection of multiple sets of mounting rods, changing the volume of the piston cylinder cavity to form alternating negative and positive pressure. S3: When the piston plate slides backward, the volume of the piston cylinder expands, generating negative pressure. High-humidity gas from downhole enters the annular inlet channel between the sampling tube and the flow tube from the downhole pipe opening. The gas is drawn into the piston cylinder through the first one-way valve arranged in an annular array at the end of the piston cylinder. When the piston plate slides forward, the volume of the piston cylinder shrinks, generating positive pressure. The gas drawn into the cylinder opens the second one-way valve and is forced into the annular return channel between the flow tube and the return cylinder. It then flows back into the downhole along the interlayer pipeline, allowing the downhole gas to circulate in the inlet channel, piston cylinder, and return channel. During the circulation process, the downhole gas from the same source circulates in the interlayer, wrapping the outer wall of the sampling tube. This keeps the temperature of the sampling tube wall consistent with the temperature of the downhole gas, preventing the generation of condensate due to the temperature difference between the inside and outside of the well during sampling. This avoids the concentration loss caused by water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs dissolving in the condensate, eliminating the problems of low detection values ​​and missed detections due to exceeding standards. S4: During the circulation process, the length of the flow pipe and the return cylinder are consistent to ensure that the axial lengths of the annular inlet channel and the annular return channel are matched. The flow pipe and the return cylinder are shorter than the sampling pipe, so that there is a certain positional difference between the position of the gas inlet and outlet in the well and the position of the subsequent sampling. This reduces the disturbance caused by the gas circulation in the well to the gas sampling at the designated position. In addition, during the circulation process, the extracted gas will flow back into the well again, reducing the impact of some gas discharge on the internal gas. S5: During the axial reciprocating movement of the drive ring, the connected plate under force is driven to reciprocate radially toward or away from the piston cylinder. When the connected plate reciprocates radially, the striking rod periodically strikes the outer wall of the return cylinder, shaking off the condensate formed inside the return cylinder. The shaken-off water is carried back down into the well along with the circulating return airflow, preventing the accumulation of water in the interlayer from blocking heat exchange and dissolving polluting gases, thus ensuring the stable constant temperature circulation effect of the interlayer. S6: After temperature adaptation treatment on the outside of the sampling tube, the gas circulation and knocking action are terminated synchronously. The internal pump of the handheld tester is started. The pump creates negative pressure and directly extracts the pollutant gas to be tested from the well along the internal channel of the sampling tube. The gas passes through the installation pipe and the air inlet and is sent into the internal detection component of the handheld tester. The detection component quantitatively analyzes the concentration of various pollutants and outputs the detection reading, thus completing the detection of pollutants in the well.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention features a double-layered, temperature-controlled circulation structure. A piston plate is driven to reciprocate via a drive assembly. A first and second one-way valve work together to ensure continuous circulation of high-humidity gas at the same temperature inside the well within the outer layer of the sampling tube. This fully encloses the outer wall of the sampling tube, ensuring the tube wall temperature remains consistent with the downhole gas temperature. This eliminates condensation caused by temperature differences between the inside and outside of the well, effectively solving the problem of water vapor liquefaction and the dissolution of water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs in condensate under large temperature differences in traditional single-layer sampling pipelines. It also eliminates concentration loss during gas transport, fundamentally avoiding the risk of low detection values ​​and missed detections due to exceeding standards, significantly improving the accuracy and reliability of downhole pollutant gas detection. 2. This device relies on a linkage component to link the gas circulation power with the striking component. When the ring axis reciprocates, the transmission pin cooperates with the inclined surface of the inclined groove to automatically drive the striking rod to periodically strike the outer wall of the return cylinder. This can shake off the condensate water that has been precipitated on the inner wall of the interlayer due to the ambient temperature difference in real time. The water can be carried back to the well with the circulating return gas, which can effectively avoid the problem of water accumulation in the interlayer blocking the constant temperature heat exchange effect and continuously dissolving polluting gases. At the same time, it can prevent condensate water from entering the main unit and causing pipeline blockage, flow reduction, and sensor corrosion damage, which greatly reduces the probability of equipment failure and extends the service life of the handheld tester and pipeline components. 3. This device adopts a structural design in which the length of the flow tube and the return tube are the same and the overall length is shorter than that of the sampling tube. On the one hand, this ensures that the lengths of the interlayer inlet and return channels are matched, the airflow is uniform and stable, and the constant temperature heat exchange effect is consistent. On the other hand, it forms a reasonable distance between the downhole circulating gas exchange position and the sampling gas inlet position, effectively avoiding airflow disturbance to the gas to be tested at the downhole point during the gas circulation process, preventing the concentration of the gas to be tested from being disturbed and diluted. At the same time, all circulating gas returns to the downhole, and there is no gas exhaust that interferes with the original gas environment downhole, further ensuring the authenticity of the fixed-point gas sampling and the stability of the detection data. 4. This device can simultaneously perform both constant-temperature gas circulation pretreatment and mechanical knocking dehydration using only one set of drive motors, eliminating the need for additional independent drive mechanisms. It boasts high structural integration and precise transmission. Before testing, it automatically completes constant-temperature adaptation and water removal from pipelines, eliminating the need for manual pretreatment or disassembly for drainage. This significantly simplifies the downhole testing process, making it suitable for handheld portable testing scenarios. It solves the problems of cumbersome operation, poor pretreatment effect, and easy introduction of detection errors by manual intervention in traditional equipment, effectively improving the efficiency of downhole contaminated gas detection. 5. The device uses a sliding rod and sleeve to form a guiding and limiting structure, ensuring smooth linear reciprocating motion of the drive ring and piston plate throughout the entire process. Combined with the sealing ring on the outside of the piston and the annular array of one-way valves, the device ensures stable switching between negative and positive pressure in the gas circulation, good gas path sealing effect, and no air leakage. The overall structure is compact and highly portable, and it can be adapted to various complex detection conditions in wells with high humidity and large temperature differences between the inside and outside of the well, such as sewage wells, septic tanks, and underground pipe networks. It effectively solves the defects of traditional equipment in terms of large detection errors, poor stability, and insufficient applicability under harsh conditions, and significantly improves the equipment's versatility and field practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram of the connecting sleeve structure of the present invention; Figure 3 This is a schematic diagram of the preprocessing component structure of the present invention; Figure 4 This is a schematic diagram of the pumping assembly and driving assembly of the present invention; Figure 5 This is a schematic diagram of the pretreatment component and the pressing component of the present invention; Figure 6 This is a schematic diagram of the drive assembly, guide assembly, and drive ring structure of the present invention; Figure 7 This is a schematic diagram of the pumping assembly and linkage assembly of the present invention; Figure 8 This is a schematic diagram of the striking component and sliding component structure of the present invention; Figure 9 This is a schematic diagram of the linkage component structure of the present invention; Figure 10 This is a schematic diagram of the pretreatment component of the present invention during pressurized air intake; Figure 11 This is a schematic diagram of the pretreatment component of the present invention during the extrusion and degassing process.

[0016] In the diagram: 101-Handheld tester; 102-Connecting sleeve; 103-Mounting tube; 104-Air inlet; 105-Sampling tube; 201-Piston cylinder; 202-Flow tube; 203-Return cylinder; 301-First check valve; 302-Second check valve; 303-Piston plate; 304-Sealing ring; 401-Drive ring; 402-Mounting rod; 501-U-shaped frame; 502-Threaded rod; 503-Threaded tube; 504-Fixing plate; 505-Drive motor; 601-Slide rod; 602-Sleeve; 701-Connecting plate; 702-Striking rod; 801-Sliding hole; 802-T-shaped rod; 901-Transmission plate; 902-Inclined groove; 903-Transmission pin; 904-Linkage frame. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1

[0019] Please see Figures 1-11 The illustrated pollutant gas detection device includes a handheld tester 101 and a connecting sleeve 102. An installation tube 103 is fixed inside the connecting sleeve 102. An air inlet 104 is provided on the handheld tester 101. One end of the installation tube 103 is detachably installed to the air inlet 104 by means of a thread. The handheld tester 101 is equipped with a pump for assisting air intake drive and a detection component for air intake detection. The other end of the installation tube 103 is fixed with a sampling tube 105 for inserting into the well for gas extraction. It should be noted here that after the temperature adaptation treatment of the outside of the sampling tube 105, the gas circulation and the knocking action are terminated simultaneously. The internal pressure pump of the handheld tester 101 is started. The pressure pump forms a negative pressure and directly extracts the polluting gas to be tested from the well along the internal channel of the sampling tube 105. The gas passes through the installation tube 103 and the air inlet 104 and is sent into the internal detection component of the handheld tester 101. The detection component quantitatively analyzes the concentration of various polluting gases and outputs the detection reading, thus completing the detection of polluting gases in the well. In addition, the pump and detection components are conventional components in this application, and their pumping principle, detection principle and control method are well known technologies, so they will not be described in detail here.

[0020] Also includes: A pretreatment component is disposed on the outside of the sampling tube 105 and is used to perform temperature adaptation treatment on the outside of the sampling tube 105 before sampling of polluted gas. The pretreatment component includes a piston cylinder 201 that is sleeved and fixed on the outside of the connecting sleeve 102. A circulation component, mounted on piston cylinder 201, is used to pre-extract some of the gas in the well and subsequently return it to the well. Piston cylinder 201 is equipped with a pumping component for auxiliary circulation and a driving component for auxiliary pumping drive. Through the cooperation of the pretreatment component, circulation component, pumping component and driving component, some of the gas in the well is extracted and returned to the well. During the gas circulation process, the sampling tube 105 is subjected to adaptive temperature treatment to avoid liquefaction and condensation inside the sampling tube 105 due to the large temperature difference between the inside and outside of the well during detection. In addition, a striking component is provided on the outside of the piston cylinder 201 for striking the outside of the circulation component, and a linkage component is provided between the drive component and the striking component for auxiliary linkage. The linkage component and the striking component separate the condensate generated on the circulation component during the gas circulation process. It should be noted that this device features a double-layered, interlayered circulation structure. Through the coordinated operation of the drive, pumping, and circulation components, a continuous circulating airflow is formed in the outer interlayer of the sampling tube 105 using high-humidity gas from the same source as the well before detection. This pre-treats the tube wall of the sampling tube 105, ensuring that its temperature matches the temperature of the well gas. This effectively suppresses the condensation of water vapor inside the pipeline, preventing concentration loss of water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs due to dissolution in condensate. This significantly improves the accuracy of downhole pollutant gas detection. Simultaneously, the device uses a linkage component to synchronize gas circulation and water removal actions. This allows for real-time shaking and removal of condensate from the inner wall of the interlayer, effectively preventing water accumulation from affecting the constant-temperature heat exchange and dissolving pollutants, ensuring smooth gas flow and stable detection conditions.

[0021] Preferably, the pretreatment assembly further includes a flow tube 202 and a reflux cylinder 203 sleeved on the outside of the sampling tube 105. One end of the flow tube 202 and the reflux cylinder 203 is fixed to one end of the piston cylinder 201. The flow tube 202 is located between the sampling tube 105 and the reflux cylinder 203. The inner side of the flow tube 202 and the outer side of the sampling tube 105 form an annular inlet channel. The inner side of the reflux cylinder 203 and the outer side of the flow tube 202 form an annular reflux channel. The lengths of the flow tube 202 and the reflux cylinder 203 are connected and are less than the length of the sampling tube 105. It should be noted that during the circulation process, the lengths of the flow pipe 202 and the return cylinder 203 are consistent to ensure that the axial lengths of the annular inlet channel and the annular return channel are matched. The flow pipe 202 and the return cylinder 203 are shorter than the sampling pipe 105, so that there is a certain positional difference between the position of the gas circulation in the well and the subsequent sampling position, which reduces the disturbance caused by the gas circulation in the well to the gas sampling at the designated position. In addition, during the circulation process, the extracted gas will flow back into the well again, reducing the impact of some gas discharge on the internal gas. The circulation assembly includes multiple sets of first one-way valves 301 fixed to the end of piston cylinder 201 in a ring array. The first one-way valves 301 are directed to the inlet channel to the inside of piston cylinder 201. Multiple sets of second one-way valves 302 are fixed to the end of piston cylinder 201 in a ring array. The second one-way valves 302 are directed to the inside of piston cylinder 201 to the return channel. A piston plate 303 is slidably connected inside piston cylinder 201. A sealing ring 304 is sleeved on the outside of piston plate 303 for sealing against the inner wall of piston cylinder 201. It should be noted here that: when the piston plate 303 slides backward, the internal volume of the piston cylinder 201 expands, generating negative pressure. High-humidity gas from the well enters the annular inlet channel between the sampling pipe 105 and the flow pipe 202 from the downhole inlet. The gas is drawn into the piston cylinder 201 through the first one-way valve 301 arranged in an annular array at the end of the piston cylinder 201. When the piston plate 303 slides forward, the internal volume of the piston cylinder 201 decreases, generating positive pressure. The gas drawn into the cylinder opens the second one-way valve 302, and the pressure... The annular return channel between the inlet pipe 202 and the return cylinder 203 flows back into the well along the interlayer pipeline, allowing the gas in the well to circulate in the inlet channel, piston cylinder 201 and return channel. During the circulation process, the gas from the same source in the well circulates in the interlayer and wraps around the outer wall of the sampling tube 105, so that the temperature of the sampling tube 105 wall is consistent with the temperature of the gas in the well. This prevents the generation of condensate in the sampling tube 105 due to the temperature difference between the inside and outside of the well during the sampling process, and avoids the concentration loss caused by the dissolution of water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs in the condensate. This also eliminates the problems of low detection values ​​and missed detections of exceeding the standard. In addition, as a conventional one-way control component, the working principle and structural composition of the check valve are well-known technologies and will not be elaborated on here.

[0022] Preferably, the pressure-drawing assembly includes a drive ring 401 sleeved on the outside of the mounting tube 103. The drive ring 401 is located between the piston cylinder 201 and the connecting sleeve 102. Multiple sets of mounting rods 402 arranged in a ring array are slidably connected on the piston cylinder 201. The two ends of each set of mounting rods 402 are fixed to the drive ring 401 and the piston plate 303, respectively. It should be noted here that: through transmission, the drive ring 401 is subjected to force and reciprocates along the axial direction of the sampling tube 105. During the movement of the drive ring 401, through the connection of multiple sets of mounting rods 402, the piston plate 303 is driven to reciprocate axially inside the piston cylinder 201, changing the volume of the inner cavity of the piston cylinder 201 to form alternating negative and positive pressure.

[0023] Preferably, the drive assembly is used to reciprocate the drive ring 401 axially. The drive assembly includes a U-shaped frame 501 fixed on the connecting sleeve 102, a threaded rod 502 rotatably connected to the U-shaped frame 501, a threaded tube 503 threadedly engaged with the threaded rod 502, a fixing plate 504 fixed on one side of the drive ring 401, one end of the threaded tube 503 fixed to the fixing plate 504, a drive motor 505 for driving the threaded rod 502 mounted on the U-shaped frame 501, and a guide assembly for guiding the drive process between the U-shaped frame 501 and the fixing plate 504. The guide assembly includes two sets of slide rods 601 fixed on the U-shaped frame 501, and the two sets of slide rods 601 are symmetrically arranged on both sides of the threaded rod 502. A sleeve 602 is slidably connected to the slide rod 601, and one end of the sleeve 602 is fixed to the fixing plate 504. It should be noted here that: the drive motor 505 drives the threaded rod 502 to rotate continuously. During the rotation of the threaded rod 502, the threaded rod 502 engages with the threaded tube 503, causing the fixed plate 504 and the drive ring 401 to move under force. During the movement, the sliding guide effect of the sleeve 602 and the slide rod 601 between the U-shaped frame 501 and the fixed plate 504 causes the drive ring 401 to reciprocate along the axial direction of the sampling tube 105 under force. In addition, the drive motor 505 is a conventional drive component in this application, and its working principle and control method are well-known technologies, so they will not be described in detail here.

[0024] Preferably, multiple sets of striking components are arranged in a ring array on the outside of the piston cylinder 201. The striking components are used to strike the outside of the return cylinder 203. The striking components include a connecting plate 701. A sliding component for assisting sliding connection is provided between the connecting plate 701 and the return cylinder 203. A striking rod 702 for assisting striking is fixed on the side of the connecting plate 701 facing the return cylinder 203. It should be noted that during the axial reciprocating movement of the drive ring 401, the linkage frame 904 moves synchronously and linearly with the drive ring 401. The end of the linkage frame 904 is fixed with a transmission pin 903, which slides into the inclined groove 902 of the transmission plate 901. Through the interaction between the transmission pin 903 and the inclined groove 902, the connecting plate 701 is subjected to force and moves. During the movement of the connecting plate 701, the sliding guide effect of the sliding hole 801 and the T-shaped rod 802 causes the connected plate 701 to reciprocate radially toward or away from the piston cylinder 201. When the connecting plate 701 reciprocates radially, the striking rod 702 periodically impacts the outer wall of the return cylinder 203, shaking off the condensate formed inside the return cylinder 203.

[0025] Preferably, the sliding assembly includes multiple sets of sliding holes 801 formed on the connecting plate 701, and a T-shaped rod 802 is slidably connected to the sliding hole 801, with one end of the T-shaped rod 802 fixed to the outer side of the piston cylinder 201; It should be noted here that the sliding hole 801 and the T-shaped rod 802 guide the movement of the connecting plate 701 after it is subjected to force.

[0026] Preferably, the linkage component includes a transmission plate 901 fixed on the connecting plate 701, a groove 902 is provided on the transmission plate 901, a transmission pin 903 is slidably connected on the groove 902, a linkage frame 904 is fixed on the drive ring 401, and the transmission pin 903 is fixed on the linkage frame 904. It should be noted that during the axial reciprocating movement of the drive ring 401, the linkage frame 904 moves synchronously and linearly with the drive ring 401. The end of the linkage frame 904 is fixed with a transmission pin 903, which is engaged in a sliding fit with the inclined groove 902 opened in the transmission plate 901. Through the interaction between the transmission pin 903 and the inclined groove 902, the connecting plate 701 is subjected to force and moves.

[0027] A method for detecting polluting gases includes the following steps: S1: Before detecting the contaminated gas in the well, thread one end of the installation tube 103 is screwed into the air inlet 104 of the handheld tester 101 and tightened. After installation, the ends of the outer flow tube 202 and return cylinder 203 of the sampling tube 105 are fixed to one end of the piston cylinder 201 to form a double-layer sandwich structure. During the detection process, one end of the sampling tube 105, flow tube 202, and return cylinder 203 are lowered to the depth to be measured in the well. The internal pump and detection components of the handheld tester 101 are powered on and ready to standby, and the drive motor 505 is powered on and ready to start. S2: Before sampling, the threaded rod 502 is continuously rotated by the drive motor 505. During the rotation of the threaded rod 502, the threaded rod 502 engages with the threaded tube 503, causing the fixed plate 504 and the drive ring 401 to move under force. During the movement, the sliding guide effect of the sleeve 602 and the slide rod 601 between the U-shaped frame 501 and the fixed plate 504 causes the drive ring 401 to reciprocate along the axial direction of the sampling tube 105 under force. During the movement of the drive ring 401, the piston plate 303 is driven to reciprocate axially inside the piston cylinder 201 through the connection of multiple sets of mounting rods 402, changing the internal volume of the piston cylinder 201 to form alternating negative and positive pressure. S3: When piston plate 303 slides backward (see...) Figure 10 The expansion of the inner cavity of piston cylinder 201 creates negative pressure. High-humidity gas from the well enters the annular inlet channel between sampling pipe 105 and flow pipe 202 from the wellhead. The gas is then drawn into the piston cylinder 201 through the first one-way valve 301 arranged in an annular array at the end of piston cylinder 201. As piston plate 303 slides forward (see...),... Figure 11 When the volume of the piston cylinder 201 decreases, positive pressure is generated. The gas drawn in into the cylinder opens the second one-way valve 302 and is forced into the annular return channel between the flow pipe 202 and the return cylinder 203. It then flows back into the well along the interlayer pipeline, causing the gas in the well to circulate in the inlet channel, piston cylinder 201 and return channel. During the circulation process, the gas from the same source in the well circulates in the interlayer and wraps around the outer wall of the sampling tube 105, so that the temperature of the sampling tube 105 wall is consistent with the temperature of the gas in the well. This prevents the sampling tube 105 from generating condensate due to the temperature difference between the inside and outside of the well during the sampling process. This avoids the concentration loss caused by water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs dissolving in the condensate, thus eliminating the problems of low detection values ​​and missed detections of exceeding the standard. S4: During the circulation process, the lengths of the flow pipe 202 and the return cylinder 203 are consistent to ensure that the axial lengths of the annular inlet channel and the annular return channel are matched. The flow pipe 202 and the return cylinder 203 are shorter than the sampling pipe 105, so that there is a certain positional difference between the position of the gas circulation in the well and the subsequent sampling position, thereby reducing the disturbance caused by the gas circulation in the well to the gas sampling at the designated position. In addition, during the circulation process, the extracted gas will flow back into the well again, reducing the impact of some gas discharge on the internal gas. S5: During the axial reciprocating movement of the drive ring 401, the linkage frame 904 moves synchronously and linearly with the drive ring 401. The transmission pin 903 is fixed at the end of the linkage frame 904. The transmission pin 903 is engaged in the inclined groove 902 opened in the transmission plate 901 for sliding cooperation. Through the interaction between the transmission pin 903 and the inclined groove 902, the connecting plate 701 is subjected to force and moves. During the movement of the connecting plate 701, through the sliding guide effect of the sliding hole 801 and the T-shaped rod 802, the connected plate 701 under force moves radially toward or away from the piston cylinder 201. When the connecting plate 701 moves radially, the striking rod 702 periodically hits the outer wall of the return cylinder 203, shaking off the condensate formed inside the return cylinder 203. The shaken-off water is carried back to the well with the circulating return airflow, avoiding the accumulation of water in the interlayer that obstructs heat exchange and dissolves polluting gases, and ensuring the stable constant temperature circulation effect of the interlayer. S6: After the temperature adaptation treatment of the outside of the sampling tube 105, the gas circulation and the knocking action are terminated synchronously. The internal pressure pump of the handheld tester 101 is started. The pressure pump forms a negative pressure and directly extracts the pollutant gas to be tested from the well along the internal channel of the sampling tube 105. The gas passes through the installation tube 103 and the air inlet 104 and is sent into the internal detection component of the handheld tester 101. The detection component quantitatively analyzes the concentration of various pollutant gases and outputs the detection reading, thus completing the detection of pollutant gases in the well.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A polluted gas detection device, comprising: The handheld tester (101) and the connecting sleeve (102) are provided. An installation tube (103) is fixed inside the connecting sleeve (102). An air inlet (104) is provided on the handheld tester (101). One end of the installation tube (103) is detachably installed to the air inlet (104) by means of a thread. The handheld tester (101) is provided with a pump for assisting air intake drive and a detection component for air intake detection. The other end of the installation tube (103) is fixed with a sampling tube (105) for inserting into the well for gas extraction. Its characteristic is that it further includes: A pretreatment component is disposed on the outside of the sampling tube (105) for temperature adaptation treatment of the outside of the sampling tube (105) before sampling of polluted gas. The pretreatment component includes a piston cylinder (201) sleeved and fixed on the outside of the connecting sleeve (102). A circulation component is provided on the piston cylinder (201) to pre-extract part of the gas in the well and then return it to the well. The piston cylinder (201) is provided with a pumping component for auxiliary circulation and a driving component for auxiliary pumping drive. Through the cooperation of the pretreatment component, circulation component, pumping component and driving component, part of the gas in the well is extracted and returned to the well. During the gas circulation process, the sampling tube (105) is subjected to adaptive temperature treatment to avoid liquefaction and condensation inside the sampling tube (105) due to the large temperature difference between the inside and outside of the well during detection. In addition, a striking component is provided on the outside of the piston cylinder (201) for striking the outside of the circulation component. A linkage component for auxiliary linkage is provided between the driving component and the striking component. The linkage component and the striking component separate the condensate generated on the circulation component during the gas circulation process.

2. The polluted gas detection device according to claim 1, characterized in that: The pretreatment assembly also includes a flow tube (202) and a reflux cylinder (203) sleeved on the outside of the sampling tube (105). One end of the flow tube (202) and the reflux cylinder (203) is fixed to one end of the piston cylinder (201). The flow tube (202) is located between the sampling tube (105) and the reflux cylinder (203). The inner side of the flow tube (202) and the outer side of the sampling tube (105) form an annular inlet channel. The inner side of the reflux cylinder (203) and the outer side of the flow tube (202) form an annular reflux channel. The lengths of the flow tube (202) and the reflux cylinder (203) are connected and are less than the length of the sampling tube (105).

3. The polluted gas detection device according to claim 2, characterized in that: The circulation assembly includes multiple sets of first one-way valves (301) arranged in a ring array fixed to the end of the piston cylinder (201). The first one-way valves (301) are directed from the inlet channel to the inside of the piston cylinder (201). Multiple sets of second one-way valves (302) arranged in a ring array are fixed to the end of the piston cylinder (201). The second one-way valves (302) are directed from the inside of the piston cylinder (201) to the return channel. A piston plate (303) is slidably connected inside the piston cylinder (201). A sealing ring (304) is sleeved on the outside of the piston plate (303) for sealing against the inner wall of the piston cylinder (201).

4. The polluted gas detection device according to claim 3, characterized in that: The pumping assembly includes a drive ring (401) sleeved on the outside of the mounting tube (103). The drive ring (401) is located between the piston cylinder (201) and the connecting sleeve (102). Multiple sets of mounting rods (402) arranged in a ring array are slidably connected on the piston cylinder (201). The two ends of each set of mounting rods (402) are fixed to the drive ring (401) and the piston plate (303) respectively.

5. The polluted gas detection device according to claim 4, characterized in that: The drive assembly is used to reciprocate the drive ring (401) axially. The drive assembly includes a U-shaped frame (501) fixed on the connecting sleeve (102). A threaded rod (502) is rotatably connected to the U-shaped frame (501). A threaded tube (503) is threadedly engaged with the threaded rod (502). A fixing plate (504) is fixed on one side of the drive ring (401). One end of the threaded tube (503) is fixed to the fixing plate (504). A drive motor (505) for driving the threaded rod (502) is installed on the U-shaped frame (501). A guide assembly for guiding the drive process is provided between the U-shaped frame (501) and the fixing plate (504).

6. The polluted gas detection device according to claim 5, characterized in that: The guide assembly includes two sets of slide rods (601) fixed on the U-shaped frame (501), and the two sets of slide rods (601) are symmetrically arranged on both sides of the threaded rod (502). A sleeve (602) is slidably connected on the slide rod (601), and one end of the sleeve (602) is fixed to the fixing plate (504).

7. The polluted gas detection device according to claim 4, characterized in that: Multiple sets of the striking components are arranged in a circular array on the outside of the piston cylinder (201). The striking components are used to strike the outside of the return cylinder (203). The striking components include a connecting plate (701). A sliding component for assisting sliding connection is provided between the connecting plate (701) and the return cylinder (203). A striking rod (702) for assisting striking is fixed on the side of the connecting plate (701) facing the return cylinder (203).

8. A polluted gas detection device according to claim 7, characterized in that: The sliding assembly includes multiple sets of sliding holes (801) opened on the connecting plate (701), and a T-shaped rod (802) is slidably connected to the sliding hole (801). One end of the T-shaped rod (802) is fixed to the outside of the piston cylinder (201).

9. A polluted gas detection device according to claim 7, characterized in that: The linkage assembly includes a transmission plate (901) fixed on a connecting plate (701), a groove (902) is provided on the transmission plate (901), a transmission pin (903) is slidably connected on the groove (902), a linkage frame (904) is fixed on the drive ring (401), and the transmission pin (903) is fixed on the linkage frame (904).

10. A method for detecting polluted gases, comprising a polluted gas detection device according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Before detecting the polluted gas in the well, thread one end of the installation pipe (103) onto the air inlet (104) of the handheld tester (101) and tighten it to fix it. S2: Before sampling, the drive ring (401) is subjected to force and reciprocates along the axial direction of the sampling tube (105) through transmission. During the movement of the drive ring (401), the piston plate (303) is driven to reciprocate axially inside the piston cylinder (201) through the connection of multiple sets of mounting rods (402), thereby changing the volume of the inner cavity of the piston cylinder (201) to form alternating negative and positive pressure. S3: When the piston plate (303) slides backward, the volume of the piston cylinder (201) expands, generating negative pressure. The high-humidity gas from the well enters the annular inlet channel between the sampling pipe (105) and the flow pipe (202) from the well port. The gas is drawn into the piston cylinder (201) through the first one-way valve (301) arranged in annular array at the end of the piston cylinder (201). When the piston plate (303) slides forward, the volume of the piston cylinder (201) shrinks, generating positive pressure. The gas drawn into the cylinder opens the second one-way valve (302). The gas is fed into the annular return channel between the flow pipe (202) and the return cylinder (203), and then returned to the well along the interlayer pipeline. This allows the gas in the well to circulate in the inlet channel, piston cylinder (201) and return channel. During the circulation process, the gas from the same source in the well circulates in the interlayer and wraps around the outer wall of the sampling tube (105), so that the temperature of the sampling tube (105) wall is consistent with the temperature of the gas in the well. This prevents the sampling tube (105) from generating condensate due to the temperature difference between the inside and outside of the well during the sampling process. This avoids the concentration loss caused by the dissolution of water-soluble pollutants such as hydrogen sulfide, ammonia, formaldehyde, and VOCs in the condensate, and eliminates the problems of low detection values ​​and missed judgments due to exceeding the standard. S4: During the circulation process, the lengths of the flow pipe (202) and the return cylinder (203) are consistent to ensure that the axial lengths of the annular inlet channel and the annular return channel are matched. The flow pipe (202) and the return cylinder (203) are shorter than the sampling pipe (105), so that there is a certain position difference between the position of the gas inlet and outlet in the well and the position of the subsequent sampling, thereby reducing the disturbance caused by the gas circulation in the well to the gas sampling at the designated position. In addition, during the circulation process, the extracted gas will flow back into the well again, reducing the impact of some gas discharge on the internal gas. S5: During the axial reciprocating movement of the drive ring (401), the connected plate (701) under force is driven to reciprocate radially toward or away from the piston cylinder (201). When the connected plate (701) reciprocates radially, the striking rod (702) periodically strikes the outer wall of the return cylinder (203), shaking off the condensate formed inside the return cylinder (203). The shaken-off water is carried back down the well along with the circulating return airflow, avoiding the accumulation of water in the interlayer that obstructs heat exchange and dissolves polluting gases, thus ensuring the stable constant temperature circulation effect of the interlayer. S6: After the temperature adaptation treatment of the outside of the sampling tube (105), the gas circulation and the knocking action are terminated synchronously. The internal pressure pump of the handheld tester (101) is started. The pressure pump forms a negative pressure and directly extracts the pollutant gas to be tested in the well along the internal channel of the sampling tube (105). The gas passes through the installation tube (103) and the air inlet (104) and is sent into the internal detection component of the handheld tester (101). The detection component quantitatively analyzes the concentration of various pollutant gases and outputs the detection reading to complete the detection of pollutant gases in the well.

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