A detection device for gas leakage in buried pipeline

Abstract

The present invention relates to the technical field of pipeline detection, and in particular to a detection device for buried pipeline gas leakage. It includes a detection tube, a driving member, an adjusting member, a sealing member and a detection member. The detection tube connects two adjacent sections of the pipeline to form a detection section. The adjusting member cooperates with the driving member in transmission. The sealing member is a double-layer structure, which drives the upper and lower layers to rotate alternately by rotating the driving end to achieve single-sided blocking / unblocking of the pipeline. The detection member is arranged on the sealing member. In the present invention, the double-layer structure switches the pipeline blocking / unblocking through relative rotation. The sealing member and the passive laser gas detector are arranged to cooperate to ensure the sealing performance of the detection section. The source laser gas detector performs gas leakage detection from both ends of the pipeline. The staff can obtain the detection data by standing on the ground and complete the multi-point synchronous detection process. The gas leakage detection process is safe, comprehensive, intelligent, accurate, efficient and has no dead angles.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and in particular to a device for detecting gas leakage in a buried pipeline. Background Art

[0002] Gas pipelines are an important part of urban municipal construction. The landfill environment and landfill time will affect the sealing of the pipelines, making them at risk of leakage. This kind of leakage is usually at an unknown location, and the leakage rate is generally small at the beginning, but it is not ruled out that the leakage volume will accumulate or the pipeline will be damaged over time. Because the buried pipeline has a certain depth, when the pipeline leaks, the rescue personnel cannot intuitively determine the specific leakage location and repair it. Generally, they make judgments by continuously excavating the covering soil layer, operating the detection settings from the outside, and combining personal experience. The judgment process of this leakage point is time-consuming and labor-intensive, and the accuracy is poor.

[0003] The Chinese patent with authorization announcement number CN218544043U provides a leakage detection and positioning device based on a city gas buried pipeline, which relates to the technical field of gas pipeline detection devices, including a main body; an electric telescopic rod A is installed in a surrounding shape on the bottom of the main body, the electric telescopic rod A line is connected to a power supply, and the bottom of the electric telescopic rod A is fixedly connected to a universal wheel; a sliding hole is opened on the main body, and an adjustment rod is slidably connected in the sliding hole of the main body.

[0004] The above device detects leaks from the outside of the pipeline. The gas needs to pass through the soil layer and diffuse into the air. This process reduces its concentration. Therefore, the error is large when detecting gas leaks from the outside, and it is difficult to detect the location of a small amount of leaks. During the detection process, the device needs to be manually pushed along the pipeline, which is not only time-consuming and laborious, but also the movement trajectory is affected by the road conditions and deviates. It is also difficult to ensure the accuracy of the detection, which is not conducive to locating the leak point. Summary of the invention

[0005] In view of the problems existing in the background technology, a device for detecting gas leakage in buried pipelines is proposed.

[0006] The present invention proposes a detection device for buried pipeline gas leakage, including a detection tube, a driving member, an adjusting member, a sealing member and a detection member. The detection tube connects two adjacent sections of the pipeline to form a detection section. The driving member is located inside the detection tube, and a rotating driving end is arranged on both sides thereof. The bottom of the adjusting member extends into the ground and cooperates with the driving member in transmission, and the top extends out of the ground for operation by staff. Two groups of sealing members are arranged in a mirror image on both sides of the driving member to cover the tube mouth of the detection tube. Each group of sealing members is a double-layer structure. The double-layer structure drives the upper and lower layers to rotate alternately through the rotating driving end to achieve single-sided blocking / unblocking of the pipeline. The detection member is arranged on the side of the seal member facing the tube mouth of the detection tube, and the detection function is activated when the pipeline is blocked.

[0007] Preferably, the sealing member comprises a fixed ventilation disk and a rotating disk coaxially arranged on one side of the ventilation disk, and the two form a double-layer structure; the ventilation disk is closer to the tube mouth of the detection tube than the rotating disk, and ventilation port 1 is arranged on it; ventilation port 2 and a sealing member are staggered on the rotating disk; ventilation port 2 and the sealing member are respectively opposite to / staggered with ventilation port 1 as the rotating disk rotates.

[0008] Preferably, a mounting groove is arranged at the center of the rotating disk; a through hole opposite to the notch of the mounting groove is arranged on the ventilation disk; the detection member is installed on the mounting groove, and its detection end enters and exits the through hole as the rotating disk rotates.

[0009] Preferably, the detection component includes a mounting seat; the mounting seat is threadedly connected to the groove wall of the mounting groove; a passive laser gas detector is arranged in the through hole; the non-detection end of the passive laser gas detector extends into the mounting groove and is connected to the mounting seat, the detection end is opposite to the opening of the through hole, and a guide block is arranged on the side wall which is slidably connected to the hole wall of the through hole.

[0010] Preferably, the driving member includes a driving box; rotating shafts are arranged on both sides of the driving box, and a driving shaft is arranged on the top; one end of the rotating shaft is connected to the center of the rotating disk on the same side, and the other end is connected to gear one; the bottom end of the driving shaft is connected to gear two, and the top end is in transmission cooperation with the adjusting member, and a passive laser gas detector two is also arranged on the driving shaft; gear one and gear two are meshingly connected.

[0011] Preferably, the adjusting member comprises an adjusting rod; the lower end of the adjusting rod extends into the ground and is coaxially connected to the driving shaft, and the upper end of the adjusting rod is exposed above the ground and is connected to the operating frame.

[0012] Preferably, the blocking member includes a blocking seat and a blocking airbag located in the blocking seat; the blocking airbag blocks a vent; an inflation and deflation valve connected to the blocking airbag is arranged on the back side of the blocking seat; the driving member includes an air box; an air cavity is arranged inside the driving shaft, and an air head is arranged outside the driving shaft, which extends into the air box and is connected to the air cavity; the outside of the air box is connected to the inflation and deflation valve through a pipeline; the air cavity is connected to an external inflation and deflation device through an adjusting rod.

[0013] Preferably, the regulating rod is hollow, the bottom end is connected to the air cavity, the top end is provided with an air valve, and the outside is sleeved with a protective tube.

[0014] Preferably, a sealing sleeve surrounding the air valve and a sealing cover cooperating with the sealing sleeve are arranged on the operating frame.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: the present invention is arranged to be arranged at intervals along the buried pipeline, has the function of gas supply, and is used as a pipeline in daily life. During detection, the double-layer structure switches the pipeline blocking / unblocking through relative rotation. There is no need for frequent installation and disassembly, which reduces the cost of detection and improves the convenience of detection. During detection, a blocking piece is set to improve the sealing of the detection section. The sealing performance of the detection section is verified by the passive laser gas detector 2. The source laser gas detector 1 is activated with the relative rotation of the double-layer structure, and gas leak detection is performed from both ends of the pipeline. The staff can obtain the detection data by standing on the ground and complete the multi-point synchronous detection process. The gas leak detection process is safe, comprehensive, intelligent, accurate, efficient, and has no blind spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a connection diagram of the buried pipeline gas leakage detection device and the buried pipeline in the present invention;

[0017] Figure 2 It is a structural schematic diagram of the buried pipeline gas leakage detection device of the present invention;

[0018] Figure 3 It is a cross-sectional view of the buried pipeline gas leakage detection device of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the detection element in the present invention;

[0020] Figure 5 It is a schematic diagram of the structure of the driving member in the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the adjusting member in the present invention.

[0022] : 1. detection cylinder; 101. mounting flange; 2. sealing member; 201. ventilation disk; 2011. ventilation port one; 2012. through hole; 202. rotating disk; 2021. ventilation port two; 2022. blocking member; 2023. mounting groove; 3. detection member; 301. passive laser gas detector one; 302. mounting seat; 303. guide block; 4. driving member; 401. rotating shaft; 402. driving box; 403. gear one; 404. gear two; 405. driving shaft; 406. gas box; 407. gas head; 408. pipeline; 5. adjusting member; 501. adjusting rod; 502. operating frame; 503. gas valve; 504. sealing sleeve; 505. sealing cover; 6. passive laser gas detector two. DETAILED DESCRIPTION Embodiment 1

[0023] like Figure 1-Figure 3As shown, a detection device for gas leakage in a buried pipeline proposed by the present invention comprises a detection cylinder 1, a driving member 4, an adjusting member 5, a sealing member 2 and a detection member 3. The detection cylinder 1 connects two adjacent sections of the pipeline through the mounting flange 101 to form a detection section; by setting the detection section at intervals along the buried pipeline, the buried pipeline is segmented for gas leakage detection. The driving member 4 is located inside the detection cylinder 1, and a rotating driving end is arranged on both sides thereof. The bottom of the adjusting member 5 extends into the ground, and cooperates with the driving member 4 in transmission, and the top extends out of the ground for operation by the staff; the staff can drive through the adjusting member 5 to start the driving member 4 by operating on the ground, and then start the subsequent detection work. Two groups of sealing members 2 are arranged in a mirror image on both sides of the driving member 4, covering the tube mouth of the detection cylinder 1, and each group of sealing members 2 is a double-layer structure. The double-layer structure drives the upper and lower layers to rotate alternately through the rotating driving end to achieve single-sided blocking / unblocking of the pipeline; by cooperating with the two groups of devices, the two ends of the pipeline can be blocked, and the sealed blocking section can be tested for gas leakage. In the non-detection state, the gas can still flow through the pipeline. The detection component 3 is arranged on the side of the sealing component 2 facing the tube mouth of the detection tube 1, and the detection function is activated when the pipeline is blocked. Through the cooperation of the two sets of devices, the corresponding detection components 3 detect the gas leakage in the blocking section from both ends. Embodiment 2

[0024] On the basis of the above-mentioned embodiments, this embodiment discloses the specific structures of the sealing member 2 and the detection member 3 .

[0025] like Figure 2-Figure 3 As shown, the sealing member 2 includes a fixed ventilation disk 201 and a rotating disk 202 coaxially arranged on one side of the ventilation disk 201, and the two form a double-layer structure; the ventilation disk 201 is closer to the tube mouth of the detection tube 1 than the rotating disk 202, and a ventilation port 1 2011 is arranged on it; the ventilation port 2021 and the blocking member 2022 are staggered on the rotating disk 202; the ventilation port 2021 and the blocking member 2022 are respectively opposite / staggered with the ventilation port 1 2011 as the rotating disk 202 rotates. When the ventilation port 2021 is opposite to the ventilation port 1 2011, the gas circulates in the pipeline and enters the gas supply mode. When the blocking member 2022 is opposite to the ventilation port 1 2011, the pipeline is blocked and enters the detection mode.

[0026] like Figure 2-Figure 4As shown, a mounting groove 2023 is provided at the center of the rotating disk 202; a through hole 2012 is provided on the ventilation disk 201, which is opposite to the notch of the mounting groove 2023; the detection member 3 is installed on the mounting groove 2023, and its detection end enters and exits the through hole 2012 as the rotating disk 202 rotates. When the vent 2021 is opposite to the vent 1 2011, the gas circulates in the pipeline and enters the gas supply mode. At this time, the detection member 3 is stored in the through hole 2012 and enters the dormant state. When the blocking member 2022 is opposite to the vent 1 2011, the pipeline is blocked and enters the detection mode. At this time, the detection member 3 exposes the detection end toward the pipeline side and enters the activated state.

[0027] like Figure 4 As shown, the detection member 3 includes a mounting seat 302; the mounting seat 302 is threadedly connected to the groove wall of the mounting groove 2023, and horizontal movement is achieved by rotating the rotating disk 202; a passive laser gas detector 301 is arranged in the through hole 2012; the non-detection end of the passive laser gas detector 301 extends into the mounting groove 2023, connected to the mounting seat 302, the detection end is opposite to the opening of the through hole 2012, and a guide block 303 is arranged on the side wall and is slidably connected to the hole wall of the through hole 2012, and a position sensor is also arranged. When the rotating disk 202 rotates, the mounting seat 302 is pushed forward and backward, so that the detection end of the passive laser gas detector 301 extends out, and after the position sensor is touched by the guide block 303, the passive laser gas detector 301 is activated, and the pipeline can be detected for gas leakage. The detection principle is as follows: According to Lambert-Beer's law, gas molecules have absorption characteristics for lasers of specific wavelengths. The detection laser will be absorbed and attenuated by the methane molecules, the main component of the gas, and the attenuation degree has a stable proportional relationship with the gas concentration. In addition, passive means that the monitoring optical terminal at the detection site does not need power supply to work. Ultimately, safe, multi-point, real-time, continuous, long-distance, stable and reliable detection of gas pipelines is achieved. Embodiment 3

[0028] On the basis of the above embodiments, this embodiment discloses the structure of the driving member 4 and the adjusting member 5 to realize the control of the sealing member 2 and the detecting member 3 .

[0029] like Figure 5As shown, the driving member 4 includes a driving box 402; a rotating shaft 401 is provided on both sides of the driving box 402, and a driving shaft 405 is provided on the top; one end of the rotating shaft 401 is connected to the center of the rotating disk 202 on the same side, and the other end is connected to the gear 1 403; the bottom end of the driving shaft 405 is connected to the gear 2 404, and the top end is in transmission with the adjusting member 5, and a passive laser gas detector 2 6 is also provided on the driving shaft 405; the gear 1 403 and the gear 2 404 are meshed and connected. The staff drives the driving shaft 405 to rotate through the adjusting member 5 on the ground. Through the transmission of the gear 1 403 and the gear 2 404, the two sets of rotating shafts 401 are driven to rotate synchronously and in the opposite direction, and finally the relative rotation of the rotating disk 202 and the ventilation disk 201 is realized, and the two sets of double-layer structures are synchronously blocked / unblocked. In addition, the passive laser gas detector 2 6 can be activated synchronously with the passive laser gas detector 1 301 to detect gas leaks in the space between the two sets of seals 2, which can verify the sealing performance of the double-layer structure on the one hand and reduce detection blind spots on the other hand, making it easier to locate the leak point.

[0030] like Figure 6 As shown, the adjusting member 5 includes an adjusting rod 501; the lower end of the adjusting rod 501 extends into the ground and is coaxially connected to the driving shaft 405, and the upper end is exposed to the ground and connected to the operating frame 502. The staff rotates the operating frame 502, which drives the adjusting rod 501 to rotate and drives the driving shaft 405 to rotate synchronously. The operating frame 502 can also be set to be electronically controlled, and driven by a motor, the detection section can detect multiple points. Embodiment 4

[0031] On the basis of the above-mentioned embodiments, this embodiment discloses the specific structure of the blocking member and the related structural improvements made to the driving member 4 and the adjusting member 5 in order to achieve blocking.

[0032] like Figure 3 , Figure 4 and Figure 5 As shown, the blocking member 2022 includes a blocking seat and a blocking airbag located in the blocking seat; the blocking airbag can be a circular structure, which is inflated to form a sphere, extends into and blocks the vent 2011, and improves the sealing performance of the double-layer structure; the front side of the blocking seat covers the vent 2011 for further sealing, and a charging and discharging valve connected to the blocking airbag is arranged on the back side; the driving member includes an air box 406; an air cavity is arranged inside the driving shaft 405, and an air head 407 extending into the air box 406 and communicating with the air cavity is arranged outside; the outside of the air box 406 is connected to the charging and discharging valve through a pipe 408; the air cavity is connected to the external charging and discharging equipment through an adjusting rod 501. The staff starts the charging and discharging equipment on the ground, and the gas enters and exits the air box 406 through the air cavity and the air head 407. Then the blocking airbag enters and exits through the pipe 408 to control its expansion / contraction and adjust the sealing performance of the double-layer structure.

[0033] It should be further explained that the regulating rod 501 is hollow, the bottom end is connected to the air cavity, the top end is provided with an air valve 503, and the outside is sleeved with a protective tube. The air valve 503 is connected to an external gas filling and discharging device to control the gas flow. The protective tube reinforces the regulating rod 501 to prevent corrosion and rust.

[0034] It should be further explained that a sealing sleeve 504 surrounding the air valve 503 and a sealing cover 505 cooperating with the sealing sleeve 504 are arranged on the operating frame 502. The sealing sleeve 504 and the sealing cover 505 can be threadedly connected or snap-fitted to cover the air valve 503 to prevent human damage. Embodiment 5

[0035] Based on the buried pipeline gas leakage detection device in the above embodiment, this embodiment provides a buried pipeline gas leakage detection method, the steps are as follows:

[0036] S1, installing the above-mentioned devices at intervals along the buried pipeline by means of the mounting flange 101 to form multiple groups of detection sections;

[0037] S2, the staff starts the multi-point adjustment member 5, the drive shaft 405 rotates, the two sets of rotating shafts 401 rotate synchronously and in opposite directions, the rotating disk 202 and the ventilation disk 201 rotate relative to each other, the blocking member 2022 is opposite to the ventilation port 1 2011, and the detection mode is entered;

[0038] S3, the rotating disk 202 rotates, and the mounting seat 302 is pushed forward and backward, so that the detection end of the passive laser gas detector 1 301 extends out, and after the in-place sensor is touched by the guide block 303, the passive laser gas detector 1 301 and the passive laser gas detector 2 6 are activated;

[0039] S4, open the air valve 503, inflate the air through the external inflation and deflation equipment, the gas enters the air box 406 through the air cavity and the air head 407, and then enters and exits the blocking air bag through the pipe 408, so that it is inflated and bulged, blocking the vent 2011, and at the same time the blocking seat covers the vent 2011 to further seal it;

[0040] S5. Repeat the above operation until both ends of each pipe section are blocked;

[0041] S6, passive laser gas detector 26 emits a detection laser to verify the sealing performance of the space between the double-layer structure (the device itself);

[0042] S7: The sealing performance does not meet the standard. Further adjust the sealing strength of the double-layer structure or check whether there is leakage in the space between the double-layer structure;

[0043] S8, the sealing performance meets the standard, the passive laser gas detector 301 emits an inspection laser to detect gas leaks from both ends of the pipeline, i.e., one on the left and one on the right;

[0044] S9. The staff receives the detection data on the ground, and obtains the gas leakage situation of each group of pipelines by comparing and analyzing the two groups of data, one on the left and one on the right.

[0045] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A buried pipeline gas leakage detection device, characterized in that: include: A detection tube (1) is connected to two adjacent sections of the pipeline to form a detection section; A driving member (4) is located inside the detection tube (1), and has a rotating driving end on both sides thereof; The adjusting member (5) has a bottom portion extending into the ground and is in transmission cooperation with the driving member (4), and a top portion extending out of the ground for operation by staff; Two groups of sealing members (2) are arranged in a mirror-image manner on both sides of the driving member (4) to cover the tube opening of the detection tube (1); each group of sealing members (2) is a double-layer structure, and the double-layer structure drives the upper and lower layers to rotate alternately by rotating the driving end, thereby achieving single-side blocking / unblocking of the pipeline; and a detection member (3), the detection member (3) being arranged on a side of the sealing member (2) facing the tube opening of the detection tube (1), and having a detection function activated when the pipeline is blocked; The sealing member (2) comprises a fixed ventilation disk (201) and a rotating disk (202) coaxially arranged on one side of the ventilation disk (201), the two forming a double-layer structure; the ventilation disk (201) is closer to the tube mouth of the detection tube (1) than the rotating disk (202), and a ventilation opening (211) is arranged on the ventilation disk; ventilation openings (221) and blocking members (222) are arranged alternately on the rotating disk (202); the ventilation openings (221) and the blocking members (222) are respectively opposite to / interlaced with the ventilation openings (211) as the rotating disk (202) rotates; A mounting groove (2023) is provided at the center of the rotating disk (202); a through hole (2012) is provided on the ventilation disk (201) and is opposite to the notch of the mounting groove (2023); the detection member (3) is installed on the mounting groove (2023), and its detection end enters and exits the through hole (2012) as the rotating disk (202) rotates; The detection member (3) comprises a mounting seat (302); the mounting seat (302) is threadedly connected to the groove wall of the mounting groove (2023); a passive laser gas detector (301) is arranged in the through hole (2012); the non-detection end of the passive laser gas detector (301) extends into the mounting groove (2023) and is connected to the mounting seat (302), the detection end is opposite to the opening of the through hole (2012), and a guide block (303) is arranged on the side wall and is slidably connected to the hole wall of the through hole (2012); The driving member (4) comprises a driving box (402); rotating shafts (401) are provided on both sides of the driving box (402), and a driving shaft (405) is provided on the top; one end of the rotating shaft (401) is connected to the center of the rotating disk (202) on the same side, and the other end is connected to gear one (403); the bottom end of the driving shaft (405) is connected to gear two (404), and the top end is in transmission cooperation with the adjusting member (5); a passive laser gas detector two (6) is also provided on the driving shaft (405); gear one (403) and gear two (404) are meshingly connected.

2. A buried pipeline gas leakage detection device according to claim 1, characterized in that: The adjusting member (5) comprises an adjusting rod (501); the lower end of the adjusting rod (501) extends into the ground and is coaxially connected to the driving shaft (405), and the upper end of the adjusting rod (501) is exposed above the ground and is connected to the operating frame (502).

3. A buried pipeline gas leakage detection device according to claim 2, characterized in that: The blocking member (2022) comprises a blocking seat and a blocking airbag located inside the blocking seat; the blocking airbag blocks the ventilation opening 1 (211); a charging and discharging valve connected to the blocking airbag is arranged on the back side of the blocking seat; the driving member comprises an air box (406); an air cavity is arranged inside the driving shaft (405), and an air head (407) is arranged outside the driving shaft, extending into the air box (406) and connected to the air cavity; The outside of the air box (406) is connected to the air charging and discharging valve via a pipeline (408); the air cavity is connected to an external air charging and discharging device via an adjusting rod (501).

4. A buried pipeline gas leakage detection device according to claim 3, characterized in that: The regulating rod (501) is hollow, with the bottom end communicating with the air cavity, the top end being provided with an air valve (503), and the outside being sleeved with a protective tube.

5. The buried pipeline gas leakage detection device according to claim 4, characterized in that: The operating frame (502) is provided with a sealing sleeve (504) surrounding the air valve (503) and a sealing cover (505) matched with the sealing sleeve (504).

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