A safety device for online monitoring of leakage in natural gas pipeline valve wells

Abstract

The present invention relates to the technical field of natural gas leakage monitoring, and specifically to a safety device for online monitoring of leakage in a natural gas pipeline valve well, comprising: a protective shell for wrapping the pipeline to be monitored, the protective shell consisting of a semi-cylinder 1 and a semi-cylinder 2, forming chamber 1 and chamber 2 between the protective shell and the pipeline to be monitored after installation; a monitoring assembly, the monitoring assembly comprising a gas hose connected to chamber 1 and chamber 2 on both sides, a movable frame slidably mounted on the semi-cylinder 1, the movable frame being provided with a clamping member movably mounted on the movable frame for squeezing the gas hose, the clamping member being used to squeeze the gas hose to prevent the two sides of the gas hose from communicating with each other; and two sets of movable blocks mounted on the semi-cylinder 1 and located on both sides of the clamping member, respectively, with guide blocks mounted on the top of the movable blocks for squeezing the movable frame and generating an alarm. The present invention can automatically determine the location of a leak when one occurs, assisting maintenance personnel in more efficient maintenance and repairs.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas leakage monitoring, and in particular to a safety device for online monitoring of leakage in a natural gas pipeline valve well. Background Art

[0002] Natural gas pipeline valve wells are key facilities in the natural gas transmission system, used to control, regulate and ensure the safety of pipeline operation. The safety device for online monitoring of natural gas pipeline valve well leakage is used to monitor the natural gas pipeline valve wells and provide alarms or signals to maintenance personnel to solve the leakage problem when there is a gas leak.

[0003] At present, the concentration monitoring method is usually used to monitor the leakage of natural gas pipeline valve wells. By setting sensors, once the natural gas in the valve well leaks and the concentration in the environment reaches a certain value, the sensor will issue an alarm or process a signal, calling professional manpower to solve the hidden dangers caused by the leakage. Because it takes a long time to accumulate the detected concentration value, the leakage monitoring is delayed, and even very small leakage points cannot be dealt with in time. For this reason, Chinese patent announcement number CN114263853A discloses a safety device for online monitoring of leakage in natural gas pipeline valve wells. By setting a limit ring on the inner wall of the cylinder b, the space outside the leakage point is very small. When the natural gas pipe leaks, the natural gas leakage volume is very small, which will cause the corresponding set of hoses to inflate and straighten, thereby triggering the pressure sensor sensing signal. The monitoring accuracy is high, the monitoring response is fast, and the structure is simple without delicate structures, which is easy to produce and manufacture.

[0004] However, in the above technical solution, multiple sets of sensors need to be installed in different chambers in order to monitor leakage in multiple directions, which increases the cost. Summary of the Invention

[0005] In view of the above shortcomings of the prior art, the present invention provides a safety device for online monitoring of leakage in natural gas pipeline valve wells, which can effectively solve the problem that multiple sets of sensors are required to perform multi-position monitoring in the prior art, thereby increasing costs.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a safety device for online monitoring of leakage in a natural gas pipeline valve well, comprising:

[0008] A protective shell for wrapping the pipeline to be monitored, the protective shell consisting of a first semi-cylinder and a second semi-cylinder, and forming a first chamber and a second chamber between the protective shell and the pipeline to be monitored after installation;

[0009] A monitoring assembly, comprising a gas hose connected to chamber one and chamber two on both sides, a movable frame slidably mounted on semi-cylinder one, and a compression member movably mounted on the movable frame for squeezing the gas hose, the compression member being used to squeeze the gas hose to prevent the two sides of the gas hose from communicating with each other;

[0010] And two groups of movable blocks are installed on the semi-cylinder and are respectively located on both sides of the pressing piece. The top of the movable block is equipped with a guide block for squeezing the movable frame and alarming.

[0011] According to some embodiments of the present invention, a slide groove is provided on the semi-cylinder, the movable block is slidably connected to the semi-cylinder and is located in the slide groove, and a spring is provided at one end of the movable block where the communicating air hole is provided, and the spring is used to always push the movable block toward the side where the guide block is not provided.

[0012] According to some embodiments of the present invention, the movable block is provided with a communicating air hole connected to the air supply hose, and the movable block is also provided with an air guide hole located below the communicating air hole, and the bottom of the movable block is provided with an exhaust pipe connected to the air guide hole.

[0013] According to some embodiments of the present invention, the second semi-cylinder body is provided with a one-way air inlet hole connected to the exhaust pipe, and the second semi-cylinder body is provided with an air bag connected to the one-way air inlet hole.

[0014] According to some embodiments of the present invention, the pressing member is composed of a column and a frustum, and the diameter of the frustum close to one end of the column is the same as that of the column and larger than the diameter of the other end. An elastic member is provided on one side of the pressing member column.

[0015] According to some embodiments of the present invention, a shift block is provided at the bottom of the movable block, and a rotating plate extending toward the shift block is rotatably mounted on the semi-cylinder.

[0016] According to some embodiments of the present invention, a trigger frame is elastically mounted on the top of the movable frame, and an alarm is provided on a side of the trigger frame close to the movable frame.

[0017] According to some embodiments of the present invention, the semi-cylinder one and the semi-cylinder two are connected by bolts, the pipeline to be monitored consists of a valve and pipe fittings located on both sides of the valve, and sealing strips are provided between the ends of the semi-cylinder one and the semi-cylinder two away from and close to the valve and the pipeline to be monitored.

[0018] According to some embodiments of the present invention, there are two groups of monitoring components on the semi-cylinder body 1, and the two groups of monitoring components are respectively located on both sides of the valve. The semi-cylinder body 1 is provided with an air inlet hole 1 extending into the chamber 1 and an air inlet hole 2 extending into the chamber 2.

[0019] Beneficial effects

[0020] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0021] 1. When a natural gas leak occurs, the pressure in chamber 1 or chamber 2 will increase, and the leaked gas will eventually enter the gas hose through the first or second air inlet hole, thereby pushing the compression piece to move away from the valve, or pushing the compression piece to move towards the valve. At the same time, the guide block squeezes the trigger frame, and finally the low-pressure alarm sounds an alarm. It can automatically determine the leak location when a leak occurs, thereby assisting maintenance personnel in more efficient maintenance and repairs.

[0022] Second, when leakage occurs, the movable frame cooperates with the guide block to slide the movable block, thereby misaligning the connecting air hole and the gas hose and connecting the air guide hole to the gas hose. At the same time, the movable block drives the rotating plate to rotate when it moves, guiding the pressing member to squeeze the elastic member when it moves and guide the side of the pressing member with the frustum toward the gas hose, thereby canceling the complete extrusion seal of the gas hose and guiding the gas into the air bag for storage, preventing large-scale natural gas leakage when opening the half-cylinder one and the half-cylinder two during maintenance, and the leaked natural gas will not suddenly enter the valve well, providing a good and safe environment for maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a partial cross-sectional view of the present invention;

[0026] Figure 3 This is a schematic diagram of the explosion structure of the monitoring component of the present invention;

[0027] Figure 4 This is a schematic structural diagram of the second half cylinder of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection between the pressing member and the movable frame of the present invention;

[0029] Figure 6 It is a partial cross-sectional view of the first half cylinder of the present invention;

[0030] Figure 7 This is a state change diagram of the clamping member during monitoring of the present invention.

[0031] Figure numerals: 1, protective shell; 101, chamber one; 102, chamber two; 11, semi-cylinder one; 111, air inlet one; 112, air inlet two; 12, semi-cylinder two; 121, one-way air inlet; 122, airbag; 123, sealing strip; 2, monitoring component; 21, movable frame; 211, trigger frame; 212, alarm; 22, pressing part; 23, elastic part; 24, gas hose; 25, rotating plate; 26, movable block; 261, connecting air hole; 262, air guide hole; 2621, exhaust pipe; 263, guide block; 264, shift block. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Refer to the attached Figure 1-7 , a safety device for online monitoring of leakage in a natural gas pipeline valve well, comprising:

[0035] A protective shell 1 is used to wrap the pipeline to be monitored. The protective shell 1 is composed of a semi-cylinder 11 and a semi-cylinder 2 12. The semi-cylinder 11 and the semi-cylinder 2 12 are connected by bolts, and a sealing strip is provided between the semi-cylinder 11 and the semi-cylinder 2 12. The sealing strip is used to increase the sealing performance of the semi-cylinder 11 and the semi-cylinder 2 12 after installation to prevent the natural gas from leaking into the surrounding environment when the pipeline to be monitored leaks. The pipeline to be monitored is composed of a valve and pipe fittings on both sides of the valve. Sealing strips 123 are provided between the ends of the semi-cylinder 11 and the semi-cylinder 2 12 away from and close to the valve and the pipeline to be monitored. After the protective shell 1 is installed, a chamber 101 and a chamber 2 102 are formed between the pipeline to be monitored. The chamber 101 is used to temporarily store the natural gas leaked from the valve and Detection is carried out, and chamber two 102 is used to temporarily store natural gas leaked from the connection between the valve and the pipeline. Multiple sets of sealing strips 123 are used to isolate the pipeline and the pipe seam to form chamber two 102, and the space containing the valve is isolated into chamber one 101, so that when checking for natural gas leakage later, it is possible to determine whether the leakage is caused by damage to the valve or improper installation of the pipe and valve or loose pipe seam. There are two groups of monitoring components 2 on the semi-cylinder one 11, and the two groups of monitoring components 2 are respectively located on both sides of the valve. The semi-cylinder one 11 is provided with an air inlet one 111 extending into chamber one 101 and an air inlet two 112 extending into chamber two 102. The two groups of monitoring components 2 cooperate to realize monitoring of the valve and the pipelines connected to both sides of the valve;

[0036] The monitoring component 2 includes a gas hose 24 connected to chamber 1 101 and chamber 2 102 on both sides, a movable frame 21 slidably mounted on the semi-cylinder 11, and a pressing member 22 movably mounted on the movable frame 21 for squeezing the gas hose 24. The pressing member 22 is used to squeeze the gas hose 24 to prevent the two sides of the gas hose 24 from communicating with each other. The two sides of the gas hose 24 are connected to chamber 1 101 and chamber 2 102 respectively. When natural gas leaks on one side, the gas in chamber 1 101 or chamber 2 102 increases, causing the internal air pressure to increase. At this time, the gas will flow into the gas hose 24, thereby squeezing and pushing the pressure. Tighten the compression piece 22 of the gas hose 24. When a natural gas leak occurs in the valve, the air pressure in the first chamber 101 increases. At this time, the gas will enter the gas hose 24 from the first air inlet 111, thereby pushing the compression piece 22 to move away from the valve. Conversely, when a natural gas leak occurs in the gap between the valve and the pipeline, the air pressure in the second chamber 102 increases. At this time, the gas will enter the gas hose 24 from the second air inlet 112, thereby pushing the compression piece 22 to move toward the valve. This allows maintenance personnel to clearly know whether the problem is with the valve or the leakage is caused by a loose connection between the pipeline and the valve, facilitating subsequent maintenance.

[0037] And two groups of movable blocks 26 are installed on the semi-cylinder 11 and are respectively located on both sides of the clamping piece 22. A guide block 263 is installed on the top of the movable block 26 for squeezing the movable frame 21 and alarming. A trigger frame 211 is elastically installed on the top of the movable frame 21, and an alarm 212 is provided on the side of the trigger frame 211 close to the movable frame 21. The movable frame 21 is driven by the movement of the clamping piece 22, and then, in cooperation with the guide block 263, when the clamping piece 22 moves to one side, due to the special shape of the guide block 263, the trigger frame 211 on the movable frame 21 will drop and squeeze the alarm 212, thereby generating an alarm signal, which makes it convenient for the equipment at the terminal to arrange professional personnel for maintenance after receiving the signal.

[0038] In the above technical solution, the protective shell 1 is installed on the natural gas pipeline to be monitored by bolts, and then monitoring is carried out through the monitoring component 2. When a natural gas leak occurs in the valve, the gas hose 24 is squeezed by the clamping member 22 in the initial state, and the two sides of the gas hose 24 on one side are not connected to each other. When natural gas appears in chamber 101, the pressure in chamber 101 will be increased and eventually enter the gas hose 24 from the air inlet 111, thereby pushing the clamping member 22 to move in the direction away from the valve, and at the same time cooperate with the guide block 263 to squeeze the trigger frame 211, and finally squeeze the alarm 212 to realize the alarm. Similarly, when a natural gas leak occurs between the valve and the pipeline, the pressure in chamber 2 102 will be increased and eventually enter the gas hose 24 from the air inlet 2 112, thereby pushing the clamping member 22 to move in the direction close to the valve, and at the same time cooperate with the guide block 263 to squeeze the trigger frame 211, and finally squeeze the alarm 212 to realize the alarm.

[0039] Furthermore, a slide groove is provided on the semi-cylinder 11, and the setting direction of the slide groove is perpendicular to the moving direction of the clamping member 22. The movable block 26 is slidably connected to the semi-cylinder 11 and is located in the slide groove, and the movable block 26 is provided with a spring at one end thereof having a communicating air hole 261. The spring is used to always push the movable block 26 toward the side where the guide block 263 is not provided. After the movable block 26 is squeezed by the movable frame 21 on the clamping member 22, the movable block 26 will be guided to compress the spring and move toward the side where the guide block 263 is provided.

[0040] Furthermore, the movable block 26 is provided with a communicating air hole 261 connected to the gas hose 24, and the movable block 26 is also provided with an air guide hole 262 located below the communicating air hole 261. The communicating air hole 261 and the air guide hole 262 are connected to the gas hose 24 by moving the movable block 26. An exhaust pipe 2621 connected to the air guide hole 262 is provided at the bottom of the movable block 26, and the leaked gas is discharged through the exhaust pipe 2621.

[0041] Among them, the semi-cylinder 2 12 is provided with a one-way air inlet hole 121 connected to the exhaust pipe 2621, and there are two groups of one-way air inlet holes 121 which are respectively connected to the two groups of exhaust pipes 2621 on the monitoring component 2, and a one-way valve is provided in the one-way air inlet hole 121, and the one-way valve can only take in air. The semi-cylinder 2 12 is provided with an air bag 122 connected to the one-way air inlet hole 121, and the air bag 122 is provided with a manual exhaust port, which is opened to exhaust when needed. Among them, a flow meter is installed at the exhaust pipe 2621, which can calculate the filling time of the air bag 122 according to the capacity of the air bag 122, and then assign the urgency of the accident to the natural gas leakage site, realize priority maintenance, and reduce safety hazards.

[0042] In addition, the clamping member 22 is composed of a cylinder and a cone, and the diameter of the cone close to one end of the cylinder is the same as that of the cylinder and larger than the diameter of the other end. An elastic member 23 is provided on one side of the cylinder of the clamping member 22, and the elastic member 23 is used to always keep the side of the clamping member 22 with the cone away from the gas hose 24.

[0043] In addition, a shift block 264 is provided at the bottom of the movable block 26, and a rotating plate 25 extending toward the shift block 264 is rotatably installed on the semi-cylinder 11. When the movable block 26 is squeezed and moved, the shift block 264 will be driven to move, and then the rotating plate 25 will be deflected. At this time, the pressing member 22 will be moved to compress the elastic member 23, and the side of the pressing member 22 with the cone is moved toward the gas hose 24, thereby canceling the complete extrusion seal of the gas hose 24. At this time, the leaked natural gas will enter the air guide hole 262 through the gas hose 24, and finally enter the air bag 122 through the exhaust pipe 2621 for temporary storage, so as to prevent the leaked natural gas from escaping into the valve well when the protective shell 1 is maintained and opened, and to prevent the natural gas concentration in the valve well from being too high during maintenance, which is safer.

[0044] When the pressure member 22 in the monitoring assembly 2 moves and triggers the alarm, the movable block 26 is driven and moved in the direction away from the pressure member 22 through the cooperation of the movable frame 21 and the guide block 263. At this time, the connecting hole 261 and the gas hose 24 are misaligned and the gas guide hole 262 is connected to the gas hose 24. At the same time, the movable block 26 drives the shift block 264 to move and shift the rotating plate 25 to rotate on the semi-cylinder 11. Then, the pressure member 22 is guided to squeeze the elastic member 23, so that the side of the pressure member 22 with the cone is close to the gas hose 24 to cancel the complete squeezing and sealing of the gas hose 24. After that, the gas will enter the gas guide hole 262 from the gas hose 24 and finally enter the air bag 122 through the exhaust pipe 2621 for storage. During maintenance, even if the semi-cylinder 11 and the semi-cylinder 2 12 are opened, the leaked natural gas will not suddenly enter the valve well, providing a good and safe environment for the maintenance personnel.

[0045] Working principle: The protective shell 1 is installed on the natural gas pipeline to be monitored by means of bolts, and the monitoring component 2 is cooperated for monitoring. Since the gas hose 24 is squeezed by the clamping piece 22 in the initial state, the two sides of the gas hose 24 on one side are not interconnected. When a natural gas leak occurs in the valve, the pressure in the chamber 101 will be increased and eventually enter the gas hose 24 from the air inlet 111, thereby pushing the clamping piece 22 to move in the direction away from the valve, and at the same time cooperate with the guide block 263 to squeeze the trigger frame 211, and finally squeeze the alarm 212 to alarm. Conversely, when a natural gas leak occurs between the valve and the pipeline, the pressure in the chamber 2 102 will be increased and eventually enter the gas hose 24 from the air inlet 2 112, thereby pushing the clamping piece 22 to move in the direction close to the valve, and at the same time cooperate with the guide block 263 to squeeze the trigger frame 211, and finally squeeze the alarm 212 to alarm. At the same time, the pressure in the monitoring component 2 When the tightening member 22 moves and triggers the alarm, the movable block 26 is driven and moved in the direction away from the pressing member 22 through the cooperation of the movable frame 21 and the guide block 263. At this time, the connecting hole 261 and the gas hose 24 are misaligned and the gas guide hole 262 is connected with the gas hose 24. At the same time, the movable block 26 drives the shift block 264 to move and shift the rotating plate 25 to rotate on the semi-cylinder 11. Then, the pressing member 22 is guided to squeeze the elastic member 23, so that the side of the pressing member 22 with the cone is close to the gas hose 24 to cancel the complete squeezing and sealing of the gas hose 24. After that, the gas will enter the gas guide hole 262 from the gas hose 24, and finally enter the air bag 122 through the exhaust pipe 2621 for storage. During maintenance, even if the semi-cylinder 11 and the semi-cylinder 2 12 are opened, the leaked natural gas will not suddenly enter the valve well, providing a good and safe environment for maintenance personnel.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A safety device for online monitoring of leakage in natural gas pipeline valve wells, characterized in that: include: A protective shell (1) for wrapping a pipeline to be monitored, wherein the protective shell (1) is composed of a first semi-cylinder (11) and a second semi-cylinder (12), and after the protective shell (1) is installed, a first chamber (101) and a second chamber (102) are formed between the protective shell (1) and the pipeline to be monitored; A monitoring assembly (2), the monitoring assembly (2) comprising a gas hose (24) connected to chamber 1 (101) and chamber 2 (102) on both sides, a movable frame (21) slidably mounted on semi-cylinder 1 (11), a pressing member (22) for squeezing the gas hose (24) being movably mounted on the movable frame (21), the pressing member (22) being used to squeeze the gas hose (24) to prevent the two sides of the gas hose (24) from communicating with each other; and two groups of movable blocks (26) mounted on the semi-cylinder (11) and respectively located on both sides of the pressing member (22), wherein a guide block (263) for squeezing the movable frame (21) and sounding an alarm is mounted on the top of the movable block (26), a slide groove is provided on the semi-cylinder (11), the movable block (26) is slidably connected to the semi-cylinder (11) and is located in the slide groove, and a spring is provided at one end of the movable block (26) provided with a communicating air hole (261), the spring being used to always push the movable block (26) toward the side where the guide block (263) is not provided, and a spring is provided on the movable block (26) for communicating with the air supply hose (24). The movable block (26) is provided with a communicating air hole (261), and an air guide hole (262) located below the communicating air hole (261) is further provided on the movable block (26). An exhaust pipe (2621) communicating with the air guide hole (262) is provided at the bottom of the movable block (26). A one-way air inlet (121) communicating with the exhaust pipe (2621) is provided on the second semi-cylinder (12), and an air bag (122) communicating with the one-way air inlet (121) is provided on the second semi-cylinder (12). A shift block (264) is provided at the bottom of the movable block (26), and a rotating plate (25) extending toward the shift block (264) is rotatably installed on the first semi-cylinder (11).

2. A safety device for online monitoring of leakage in a natural gas pipeline valve well according to claim 1, characterized in that: The pressing member (22) is composed of a column and a frustum, and the diameter of the frustum close to one end of the column is the same as that of the column and larger than the diameter of the other end. The pressing member (22) is provided with an elastic member (23) on one side of the column.

3. The safety device for online monitoring of leakage in a natural gas pipeline valve well according to claim 1, characterized in that: A trigger frame (211) is elastically mounted on the top of the movable frame (21), and an alarm (212) is provided on a side of the trigger frame (211) close to the movable frame (21).

4. The safety device for online monitoring of leakage in a natural gas pipeline valve well according to claim 1, characterized in that: The semi-cylinder one (11) and the semi-cylinder two (12) are connected by bolts, and the pipeline to be monitored is composed of a valve and pipe fittings located on both sides of the valve. Sealing strips (123) are provided between the ends of the semi-cylinder one (11) and the semi-cylinder two (12) away from the valve and the pipeline to be monitored.

5. The safety device for online monitoring of leakage in a natural gas pipeline valve well according to claim 4, characterized in that: The monitoring components (2) on the semi-cylinder (11) are provided with two groups, and the two groups of monitoring components (2) are respectively located on both sides of the valve. The semi-cylinder (11) is provided with an air inlet hole (111) extending into the chamber (101) and an air inlet hole (112) extending into the chamber (102).

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