Control system for pressure safety monitoring of gas pipeline

Abstract

The utility model relates to the technical field of gas pipelines, and discloses a control system for pressure safety monitoring of a gas pipeline, a pressure transmitter is arranged at the position, between a pressure reducing valve and a stop valve, of the gas pipeline, the pressure transmitter is connected to an alarm controller through a cable, and the stop valve is connected to the alarm controller through a cable; and an anti-leakage sealing assembly is arranged at the joint of the pressure transmitter and the gas pipeline and is used for communicating the pressure transmitter with the gas pipeline. The alarm controller regulates and controls opening and closing of the stop valve through the pressure value transmitted by the pressure transmitter, automatic regulation and control of opening and closing of the stop valve are achieved, meanwhile, the manual regulation and control function is supported, and different air pressure value ranges of all the pressure measuring points can be set through the alarm controller so that the pressure value state of the whole system can be monitored in real time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas pipeline technical field, concretely is a kind of control system of gas pipeline pressure safety monitoring. BACKGROUND

[0002] Gas pipeline pressure safety monitoring system is one of the key core technologies to ensure gas safety.In conventional structure, the system is mainly composed of pressure reducing valve and stop valve.Under the existing technical system, the pressure reducing valve undertakes the task of reducing the gas pressure in the pipeline, and the stop valve is responsible for controlling the flow of gas in the pipeline.The system realizes the regulation and control of the gas pressure value in the pipeline according to the pre-set pressure reducing value of the pressure reducing valve, and monitors the gas pressure value with the help of the detection device of the stop valve to determine whether it meets the pre-set pressure value, and then decides whether to trigger the stop valve action to close the pipeline.However, such system has obvious disadvantages, and its reliability is greatly affected by the pressure reducing valve and stop valve.More importantly, it is difficult for workers to monitor the pressure value in the gas pipeline intuitively and in real time, which undoubtedly poses a hidden danger to the safety of the operation and cannot effectively ensure the safety of the operation process.

[0003] In view of the above technical problems, Chinese patent application No.CN213513214U, a gas pipeline pressure real-time monitoring device, obtains the pressure values at different positions through pressure sensors, and then transmits the pressure values to a monitor.When gas leakage, abnormal valve cut-off and other events occur in the pipeline, the operating pressure will change, and after comparing the pressure change with the pre-set standard pressure value of the monitor, the real-time and accurate monitoring of the pressure value in the pipeline is realized.

[0004] The gas pipeline pressure real-time monitoring device is provided with pressure sensors, which can monitor the pressure value in the gas pipeline in real time, but does not fully consider the situation that the pressure sensors are connected with the pipeline through threads, flanges or welded interfaces.In actual application, these connections are prone to leakage due to poor sealing.A small amount of gas leakage has little effect on the detected gas pressure value, so it is easy to be ignored.However, if not effectively controlled, with the continuous leakage of excess gas into the air, it is likely to cause explosion, so that the monitoring device completely loses the function of safety monitoring. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the shortcomings of the prior art, the utility model provides a control system for gas pipeline pressure safety monitoring, which has the advantages of real-time monitoring of gas pressure value in the gas pipeline and enhancing the sealing effect of the connection between pressure transmitter and pipeline, and solves the problem of unable to monitor the gas pressure value in the gas pipeline in real time.

[0007] (II) Technical solutions

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A control system for monitoring the pressure safety of a gas pipeline includes a gas pipeline and a pressure reducing valve and a shut-off valve installed on the gas pipeline. A pressure transmitter is also installed on the gas pipeline between the pressure reducing valve and the shut-off valve. The pressure transmitter is connected to an alarm controller via a cable. The shut-off valve is also connected to the alarm controller via a cable. The alarm controller receives the pressure value transmitted by the pressure transmitter and has the functions of automatically regulating and manually controlling the opening and closing of the shut-off valve.

[0010] The pressure transmitter is equipped with a leak-proof sealing assembly at the connection point with the gas pipeline. This leak-proof sealing assembly is designed to connect the pressure transmitter and the gas pipeline, and its function is to increase the sealing effect at the connection point to prevent gas leakage. The leak-proof sealing assembly includes:

[0011] A connecting seat is fixedly installed on a gas pipeline. The connecting seat is a three-way pipe composed of a sealing column and an air inlet pipe. Both ends of the air inlet pipe are connected to the gas pipeline, with the purpose of allowing gas from the gas pipeline to enter the air inlet pipe.

[0012] The inner sealing tube is connected to the pressure transmitter and the sealing column at both ends, respectively. The inner sealing tube is embedded in the sealing column and its function is to pass the gas in the gas pipeline into the pressure transmitter.

[0013] Preferably, the leak-proof sealing assembly further includes an outer sealing pipe fixedly installed on the pressure transmitter outside the inner sealing pipe. The outer sealing pipe and the inner sealing pipe have a gap. The inner surface of the outer sealing pipe is connected to the outer surface of the sealing column, and the outer surface of the inner sealing pipe is connected to the inner surface of the sealing column. Its function is to achieve a double-layer sealing effect at the connection between the pressure transmitter and the gas pipeline by connecting both the inner and outer sealing pipes to the sealing column.

[0014] Preferably, the leak-proof sealing assembly further includes:

[0015] The inner ring slider is slidably disposed inside the inner sealing tube. The inner ring slider is a magnetic ring that fits against the inner surface of the inner sealing tube.

[0016] An outer ring slider is slidably disposed in the gap between the outer sealing tube and the inner sealing tube. The outer ring slider is a magnetic ring. The inner surface of the outer ring slider is connected to the outer surface of the inner sealing tube, and the outer surface of the outer ring slider is connected to the inner surface of the outer sealing tube.

[0017] A blocking block is slidably disposed inside the sealing column, and the inner ring slider is fixedly connected to the blocking block by a connecting rod;

[0018] When gas is released, the outer ring slider slides towards the pressure transmitter along the gap between the outer and inner sealing tubes under the push of the gas. The inner ring slider slides towards the pressure transmitter along the inner sealing tube under the magnetic force of the outer ring slider. The blocking block blocks the sealing column, thereby automatically blocking the connection between the pressure transmitter and the gas pipeline to avoid continuous gas leakage and prevent excessive gas from entering the air and causing an explosion. The alarm controller receives the pressure value data and automatically controls the shut-off valve to close the gas pipeline.

[0019] Preferably, the blocking block has a convex structure and consists of a plug and a stop. The plug is fixedly connected to the inner ring slider by a connecting rod. When venting, the outer surface of the plug is in contact with the inner surface of the sealing column. The plug is located between the inner sealing tube and the air inlet tube and is used to block the sealing column. The stop is a semi-cylinder with a diameter larger than that of the sealing column. The arc surface of the semi-cylinder is in contact with the inner surface of the air inlet tube. The function of the stop is to limit the position of the plug sliding towards the pressure transmitter.

[0020] Preferably, the leak-proof sealing assembly further includes a limiting block fixedly disposed on the inner surface of the inner sealing tube. The limiting block is located between the inner ring slider and the blocking block, and its function is to limit the position of the inner ring slider and the blocking block to prevent them from being pushed away from the sealing column by the gas.

[0021] Preferably, one end of the pressure transmitter is connected to an alarm light, which is used to sound an alarm when the gas exceeds the pressure value range set by the pressure transmitter, so as to promptly notify the operators.

[0022] Preferably, the alarm controller is equipped with a display screen, buttons, pressure tap alarm lights, and status lights. The buttons allow on-site operators to adjust different parameters for each pressure tap. The pressure tap alarm lights display the pressure status of each pressure tap, and the status lights display the operating status of the overall control system.

[0023] Preferably, a pressure gauge is also included, which is installed on the gas pipeline downstream of the shut-off valve. Its function is to detect the gas pressure in the gas pipeline downstream of the shut-off valve, in order to monitor the working status of the shut-off valve.

[0024] Preferably, a manual switch is provided at the connection between the pressure transmitter and the leak-proof sealing assembly. The function of the manual switch is to allow the operator to manually close the gas passage at the air inlet of the pressure transmitter.

[0025] Preferably, the pressure transmitter also includes a pressure display screen, which displays the pressure value after pressure reduction in real time.

[0026] The pressure value.

[0027] (III) Beneficial Effects

[0028] Compared with the prior art, this utility model provides a control system for monitoring the pressure safety of gas pipelines, which has the following beneficial effects:

[0029] 1. The control system for monitoring the pressure safety of the gas pipeline uses a pressure transmitter installed between the pressure reducing valve and the shut-off valve on the gas pipeline. The pressure transmitter is connected to the alarm controller via a cable, and the shut-off valve is connected to the alarm controller via a cable. The alarm controller regulates the opening and closing of the shut-off valve based on the pressure value transmitted by the pressure transmitter, thereby achieving automatic control of the shut-off valve's opening and closing. It also supports manual control. Furthermore, the alarm controller can set different gas pressure ranges for each pressure tapping point to monitor the pressure status of the entire system in real time.

[0030] 2. The control system for monitoring the pressure safety of the gas pipeline also includes a leak-proof sealing component at the connection between the pressure transmitter and the gas pipeline. The leak-proof sealing component includes a connecting seat on the gas pipeline, an inner sealing pipe connecting the pressure transmitter and the connecting seat, and an outer sealing pipe located outside the inner sealing pipe. The double-layer sealing effect at the connection between the pressure transmitter and the gas pipeline is achieved by connecting both the inner sealing pipe and the outer sealing pipe to the connecting seat.

[0031] 3. The control system for monitoring the pressure safety of this gas pipeline also includes an inner ring slider sliding inside the inner sealing pipe, an outer ring slider sliding between the inner and outer sealing pipes, and a blocking block sliding inside the sealing column. The inner and outer ring sliders are fixedly connected by a connecting rod. Driven by gas, the outer ring slider slides along the gap between the outer and inner sealing pipes towards the pressure transmitter. The inner ring slider, under the magnetic force of the outer ring slider, slides along the inner sealing pipe towards the pressure transmitter. The blocking block blocks the sealing column. This automatically seals the connection between the pressure transmitter and the gas pipeline to prevent continuous gas leakage and to prevent excessive gas from entering the air and causing an explosion. Since the gas flow to the pressure transmitter is stopped, any excessively low pressure values ​​detected by the pressure transmitter will be sent to the alarm controller. The alarm controller receives the pressure data and automatically controls the shut-off valve to close the gas pipeline. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the control system for monitoring the pressure safety of gas pipelines according to this utility model.

[0033] Figure 2 This utility model relates to a control system for monitoring and protecting the pressure of gas pipelines. Figure 1 Enlarged diagram of point A in the middle.

[0034] Figure 3 This is a schematic diagram of the connection between the pressure transmitter and the gas pipeline in the control system for monitoring the pressure safety of gas pipelines according to this utility model.

[0035] Figure 4 This is an exploded view of the connection between the pressure transmitter and the gas pipeline in the control system for gas pipeline pressure safety monitoring of this utility model.

[0036] Figure 5 This utility model relates to a control system for monitoring and protecting the pressure of gas pipelines. Figure 4 Enlarged schematic diagrams of numbers 53, 54, and 55.

[0037] Figure 6 The diagrams for 52, 53, and 54 are structural schematics of the control system for gas pipeline pressure safety monitoring of this utility model.

[0038] Figure 7 This is a schematic diagram of the pressure transmitter and its inlet of the control system for gas pipeline pressure safety monitoring of this utility model.

[0039] Figure 8 This is an isometric sectional view of the connection between the pressure transmitter and the gas pipeline in the normal state of the control system for monitoring the pressure safety of gas pipelines according to this utility model.

[0040] Figure 9 This is an isometric sectional view of the connection between the pressure transmitter and the gas pipeline in the gas pipeline pressure safety monitoring control system of this utility model during a gas leakage state.

[0041] Figure 10 This is a schematic diagram of the alarm controller of the gas pipeline pressure safety monitoring control system of this utility model.

[0042] In the diagram: 1. Gas pipeline; 2. Pressure gauge; 3. Pressure reducing valve; 4. Pressure transmitter; 41. Alarm light; 42. Pressure display screen; 43. Manual switch; 5. Leak-proof sealing assembly; 51. Outer sealing pipe; 52. Connecting seat; 521. Sealing column; 522. Inlet pipe; 53. Inner ring slider; 54. Outer ring slider; 55. Blocking block; 551. Blocking block; 552. Stop block; 56. Inner sealing pipe; 57. Limit block; 6. Shut-off valve; 7. Alarm controller; 71. Display screen; 72. Button; 73. Pressure tap alarm light; 74. Status light. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] Example 1:

[0048] This embodiment provides a control system for monitoring the pressure safety of gas pipelines, which has the following technical features.

[0049] Please see Figures 1-10 A control system for monitoring the pressure safety of a gas pipeline includes a gas pipeline 1 and a pressure reducing valve 3 and a shut-off valve 6 installed on the gas pipeline 1. A pressure transmitter 4 is also installed on the gas pipeline 1 between the pressure reducing valve 3 and the shut-off valve 6. The pressure transmitter 4 is connected to an alarm controller 7 via a cable. The shut-off valve 6 is also connected to the alarm controller 7 via a cable. The alarm controller 7 controls the opening and closing of the shut-off valve 6 based on the pressure value transmitted by the pressure transmitter 4. When the detected pressure value is outside the range of AB, the alarm controller 7 controls the shut-off valve 6 to close.

[0050] A leak-proof sealing assembly 5 is provided at the connection between the pressure transmitter 4 and the gas pipeline 1. The leak-proof sealing assembly 5 is used to connect the pressure transmitter 4 and the gas pipeline 1. The leak-proof sealing assembly 5 includes:

[0051] The connecting seat 52 is fixedly installed on the gas pipeline 1. The connecting seat 52 is a three-way pipe composed of a sealing column 521 and an air inlet pipe 522. The two ends of the air inlet pipe 522 are threadedly connected to the gas pipeline 1, which is intended to allow the gas in the gas pipeline 1 to enter the air inlet pipe 522.

[0052] The inner sealing tube 56 is connected to the pressure transmitter 4 and the sealing column 521 at both ends. The inner sealing tube 56 is embedded in the sealing column 521 and is used to pass the gas in the gas pipeline 1 into the pressure transmitter 4.

[0053] The inner surface of the sealing column 521 is provided with threads, and the outer surface of the inner sealing tube 56 is provided with threads corresponding to the inner surface of the sealing column 521. The sealing column 521 and the inner sealing tube 56 are connected by threads.

[0054] In an optional embodiment, the leak-proof sealing assembly 5 further includes an outer sealing tube 51 located outside the inner sealing tube 56 and connected to the pressure transmitter 4 by a thread. The outer sealing tube 51 and the inner sealing tube 56 are provided with a gap. The inner surface of the outer sealing tube 51 is connected to the outer surface of the sealing column 521 by a thread, and the outer surface of the inner sealing tube 56 is connected to the inner surface of the sealing column 521 by a thread.

[0055] It should be noted that one end 4 of both the inner sealing tube 56 and the outer sealing tube 51 is threaded to the pressure transmitter, and the other end is threaded to the sealing column 521. The inner sealing tube 56 is inside the sealing column 521, and the outer sealing tube 51 is outside the sealing column 521, thus achieving a double-layer sealing effect at the connection between the pressure transmitter and the gas pipeline.

[0056] In an optional embodiment, the leak-proof sealing assembly 5 further includes:

[0057] The inner ring slider 53 is slidably disposed inside the inner sealing tube 56. The inner ring slider 53 is a magnetic ring that fits against the inner surface of the inner sealing tube 56.

[0058] The outer ring slider 54 is slidably disposed in the gap between the outer sealing tube 51 and the inner sealing tube 56. The outer ring slider 54 is a magnetic ring. The inner surface of the outer ring slider 54 is connected to the outer surface of the inner sealing tube 56, and the outer surface of the outer ring slider 54 is connected to the inner surface of the outer sealing tube 51.

[0059] The blocking block 55 is slidably disposed inside the sealing column 521. The inner ring slider 53 and the blocking block 55 are fixedly connected by a connecting rod, and the two ends of the connecting rod are welded to the inner ring slider 53 and the blocking block 55 respectively.

[0060] When the gas is released, the outer ring slider 54 slides along the gap between the outer sealing tube 51 and the inner sealing tube 56 towards the pressure transmitter 4 under the push of the gas. The inner ring slider 53 slides along the inner sealing tube 56 towards the pressure transmitter 4 under the magnetic force of the outer ring slider 54. The blocking block 55 is used to block the sealing column 521 to prevent the gas from continuously leaking.

[0061] It should be noted that when gas leakage occurs at the threaded connection between the inner sealing tube 56 and the sealing column 521, the leaked gas flows along the gap between the inner sealing tube 56 and the sealing column 521 to the outer sealing tube 51. The leaked gas pushes the outer ring slider 54 to slide towards the pressure transmitter 4. The inner ring slider 53 slides synchronously towards the pressure transmitter 4 under the magnetic force of the outer ring slider 54. The inner ring slider 53 drives the blocking block 55 to slide to the end where the inner sealing tube 56 and the sealing column 521 are connected through the connecting rod. The thickness of the inner sealing tube 56 itself limits the blocking block 55 to no longer slide, thus blocking the sealing column 521.

[0062] In an optional embodiment, the blocking block 55 has a convex structure and consists of a plug 551 and a stop block 552. The plug 551 is fixedly connected to the inner ring slider 53 by a connecting rod. When the air is released, the outer surface of the plug 551 is in contact with the inner surface of the sealing column 521. The plug 551 is located between the inner sealing tube 56 and the air inlet tube 522 and is used to block the sealing column 521. The stop block 552 is a semi-cylinder with a diameter larger than that of the sealing column 521. The arc surface of the semi-cylinder is in contact with the inner surface of the air inlet tube 522 and is used to limit the position of the plug 551 sliding towards the pressure transmitter 4.

[0063] It should be noted that the surfaces of the blocking block 551 and the arc surfaces of the baffle block 552 are both arc surfaces at their junctions with the plane, so that the gas can flow along the arc surface towards the pressure transmitter 4. The diameter of the baffle block 552 is equal to the diameter of the inlet pipe 522. By having the arc surface of the baffle block 552 fit against the inner surface of the inlet pipe 522, the gas flow between the sealing column 521 and the inlet pipe 522 is cut off to prevent continuous gas leakage.

[0064] In an optional embodiment, the leak-proof sealing assembly 5 further includes a limiting block 57 welded to the inner surface of the inner sealing tube 56, the limiting block 57 being located between the inner ring slider 53 and the blocking block 55, and designed to limit the position of the inner ring slider 53 and the blocking block 55.

[0065] It should be noted that the outer surface of the limiting block 57 is fixed to the inner surface of the inner sealing tube 56 by welding. The limiting block 57 is a ring with the same width as the inner ring slider 53. The ring is provided with a hole that allows the connecting rod to pass through. The function of fixing the inner ring slider 53 is achieved by setting the limiting block 57.

[0066] In an optional embodiment, one end of the pressure transmitter 4 is connected to an alarm light 41, which is used to trigger an alarm when the gas exceeds the pressure value range set by the pressure transmitter 4.

[0067] It should be noted that when the pressure value detected by the pressure transmitter is outside the range of AB, the alarm light 41 will be activated via an electrical signal.

[0068] In an optional embodiment, the alarm controller 7 is equipped with a display screen 71, a button 72, a pressure tap alarm light 73, and a status light 74. The button 72 is used by on-site operators to adjust parameters, the pressure tap alarm light 73 is used to display the pressure status of each pressure tap, and the status light 74 is used to display the working status of the overall control system.

[0069] It should be noted that, through the coordinated operation of button 72 and display screen 71, the operator can retrieve the pressure value detected by pressure transmitter 4 and set the pressure alarm range at any time. For example, when the pressure value is lower than A or higher than B, status light 74 and the corresponding pressure tap alarm light 73 will flash. Status light 74 facilitates the operator's overall control of the system's working status, and the set pressure tap alarm light 73 facilitates the operator's timely identification of the specific pressure tap that exceeds the pressure value range.

[0070] In an optional embodiment, a pressure gauge 2 is also included, disposed on the gas pipeline 1 downstream of the shut-off valve 6, for detecting the gas pressure inside the gas pipeline 1.

[0071] It should be noted that when the shut-off valve 6 is closed under the control of the alarm controller 7, the value of pressure gauge 2 is 0. If the pressure gauge 2 is not 0, the shut-off valve 6 is malfunctioning.

[0072] In an optional embodiment, a manual switch 43 is provided at the connection between the pressure transmitter 4 and the leak-proof sealing assembly 5, the manual switch 43 being used to manually shut off the gas passage.

[0073] It should be noted that the manual switch 43 is connected by a thread to the connection between the pressure transmitter 4 and the leak-proof sealing assembly 5.

[0074] In an optional embodiment, the pressure transmitter 4 further includes a pressure display screen 42 for displaying the pressure value after depressurization in real time.

[0075] It should be noted that the pressure value and corresponding pressure range displayed on the pressure display screen 42 are consistent with the data on the alarm controller 7. When the pressure range is changed on the alarm controller 7, an electrical signal is sent through the cable, and the pressure display screen 42 changes synchronously.

[0076] Working principle:

[0077] Under normal operating conditions, the inner ring slider 53 and the blocking block 55 are fixed by the limiting block 57. Gas flows from the gap between the blocking block 55 and the air inlet pipe 522 to the pressure transmitter 4. The pressure transmitter 4 sends the detected gas pressure value to the alarm controller 7 through the cable. The pressure display screen 42 and the alarm controller 7 display the corresponding data in real time.

[0078] When gas leaks at the connection between the inner sealing pipe 56 and the sealing column 521, the gas flows along the inner sealing pipe 56 and the sealing column 521 to the outer sealing pipe 51. The leaked gas pushes the outer ring slider 54 to slide towards the pressure transmitter 4. The inner ring slider 53 slides synchronously towards the pressure transmitter 4 under the magnetic force of the outer ring slider 54. The inner ring slider 53 drives the block 551 to slide into the sealing column 521 through the connecting rod. When the arc surface of the block 552 is completely in contact with the inner surface of the air inlet pipe 522, the gas flow between the sealing column 521 and the air inlet pipe 522 is cut off to prevent continuous gas leakage.

[0079] In summary, the control system for monitoring the pressure safety of the gas pipeline uses a pressure transmitter 4 installed between the pressure reducing valve 3 and the shut-off valve 6 on the gas pipeline 1. The pressure transmitter 4 is connected to the alarm controller 7 via a cable, and the shut-off valve 6 is also connected to the alarm controller 7 via a cable. The alarm controller 7 controls the opening and closing of the shut-off valve 6 based on the pressure value transmitted by the pressure transmitter 4, thus achieving automatic control of the opening and closing of the shut-off valve 6. It also supports manual control. Furthermore, the alarm controller 7 can set different gas pressure ranges for each pressure tapping point to monitor the pressure status of the entire system in real time.

[0080] The control system for monitoring the pressure safety of the gas pipeline also includes a leak-proof sealing component 5 at the connection between the pressure transmitter 4 and the gas pipeline 1. The leak-proof sealing component 5 includes a connecting seat 52 on the gas pipeline 1, an inner sealing pipe 56 connecting the pressure transmitter 4 and the connecting seat 52, and an outer sealing pipe 51 located outside the inner sealing pipe 56. The double-layer sealing effect at the connection between the pressure transmitter 4 and the gas pipeline 1 is achieved by connecting both the inner sealing pipe 56 and the outer sealing pipe 51 to the connecting seat 52.

[0081] The control system for monitoring the pressure safety of the gas pipeline also includes an inner ring slider 53 sliding inside the inner sealing pipe 56, an outer ring slider 54 sliding between the inner sealing pipe 56 and the outer sealing pipe 51, and a blocking block 55 sliding inside the sealing column 521. The inner ring slider 53 and the outer ring slider 54 are fixedly connected by a connecting rod. Driven by gas, the outer ring slider 54 slides along the gap between the outer sealing pipe 51 and the inner sealing pipe 56 towards the pressure transmitter 4. The inner ring slider 53, under the magnetic force of the outer ring slider 54, slides along the inner sealing pipe 56 towards the pressure transmitter 4. The blocking block 55 blocks the sealing column 521. This automatically blocks the connection between the pressure transmitter 4 and the gas pipeline 1 to prevent continuous gas leakage and to prevent excessive gas from entering the air and causing an explosion. Since the gas flow to the pressure transmitter 4 is stopped, if the pressure transmitter 4 detects an excessively low pressure value, it will send it to the alarm controller 7. The alarm controller 7 receives the pressure data and automatically controls the shut-off valve 6 to close the gas pipeline 1.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0083] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control system for monitoring the pressure safety of a gas pipeline, comprising a gas pipeline (1) and a pressure reducing valve (3) and a shut-off valve (6) installed on the gas pipeline (1), characterized in that: The gas pipeline (1) is also equipped with a pressure transmitter (4) between the pressure reducing valve (3) and the shut-off valve (6). The pressure transmitter (4) is connected to the alarm controller (7) via a cable. The shut-off valve (6) is connected to the alarm controller (7) via a cable. The alarm controller (7) controls the opening and closing of the shut-off valve (6) through the pressure value transmitted by the pressure transmitter (4). A leak-proof sealing assembly (5) is provided at the connection between the pressure transmitter (4) and the gas pipeline (1). The leak-proof sealing assembly (5) is used to connect the pressure transmitter (4) and the gas pipeline (1). The leak-proof sealing assembly (5) includes: The connecting seat (52) is fixedly installed on the gas pipeline (1). The connecting seat (52) is a three-way pipe composed of a sealing column (521) and an air inlet pipe (522). The two ends of the air inlet pipe (522) are connected to the gas pipeline (1) to pass the gas in the gas pipeline (1) into the air inlet pipe (522). The inner sealing tube (56) is connected to the pressure transmitter (4) and the sealing column (521) at both ends respectively. The inner sealing tube (56) is embedded in the sealing column (521) and is used to pass the gas in the gas pipeline (1) into the pressure transmitter (4).

2. The control system for monitoring the pressure safety of a gas pipeline according to claim 1, characterized in that, The leak-proof sealing assembly (5) also includes an outer sealing tube (51) fixedly installed on the pressure transmitter (4) outside the inner sealing tube (56). The outer sealing tube (51) and the inner sealing tube (56) have a gap. The inner surface of the outer sealing tube (51) is connected to the outer surface of the sealing column (521), and the outer surface of the inner sealing tube (56) is connected to the inner surface of the sealing column (521).

3. The control system for monitoring the pressure safety of a gas pipeline according to claim 2, characterized in that, The leak-proof sealing assembly (5) also includes: The inner ring slider (53) is slidably disposed inside the inner sealing tube (56). The inner ring slider (53) is a magnetic ring that fits against the inner surface of the inner sealing tube (56). The outer ring slider (54) is slidably disposed in the gap between the outer sealing tube (51) and the inner sealing tube (56). The outer ring slider (54) is a magnetic ring. The inner surface of the outer ring slider (54) is connected to the outer surface of the inner sealing tube (56), and the outer surface of the outer ring slider (54) is connected to the inner surface of the outer sealing tube (51). The blocking block (55) is slidably disposed inside the sealing column (521), and the inner ring slider (53) is fixedly connected to the blocking block (55) by a connecting rod; When the gas is released, the outer ring slider (54) slides along the gap between the outer sealing tube (51) and the inner sealing tube (56) towards the pressure transmitter (4) under the push of the gas. The inner ring slider (53) slides along the inner sealing tube (56) towards the pressure transmitter (4) under the magnetic force of the outer ring slider (54). The blocking block (55) is used to block the sealing column (521) to prevent the gas from continuously leaking.

4. The control system for monitoring the pressure safety of a gas pipeline according to claim 3, characterized in that, The blocking block (55) has a convex structure. The blocking block (55) is composed of a blocking block (551) and a stop block (552). The blocking block (551) is fixedly connected to the inner ring slider (53) by a connecting rod. When the gas is released, the outer surface of the plug (551) is in contact with the inner surface of the sealing column (521). The plug (551) is located between the inner sealing tube (56) and the air inlet pipe (522) and is used to block the sealing column (521). The stop block (552) is a semi-cylinder with a diameter larger than that of the sealing column (521). The arc surface of the semi-cylinder is in contact with the inner surface of the air inlet pipe (522) and is used to limit the position of the plug (551) sliding towards the pressure transmitter (4).

5. The control system for monitoring the pressure safety of a gas pipeline according to claim 4, characterized in that, The leak-proof sealing assembly (5) also includes a limiting block (57) fixedly disposed on the inner surface of the inner sealing tube (56). The limiting block (57) is located between the inner ring slider (53) and the blocking block (55) and is used to limit the position of the inner ring slider (53) and the blocking block (55).

6. The control system for monitoring the pressure safety of a gas pipeline according to claim 1, characterized in that, One end of the pressure transmitter (4) is connected to an alarm light (41) for alarming when the gas exceeds the pressure value range set by the pressure transmitter (4).

7. The control system for monitoring the pressure safety of a gas pipeline according to claim 1, characterized in that, The alarm controller (7) is equipped with a display screen (71), buttons (72), pressure tap alarm lights (73) and status lights (74). The buttons (72) are used by on-site operators to adjust parameters. The pressure tap alarm lights (73) are used to display the pressure status of each pressure tap. The status lights (74) are used to display the working status of the overall control system.

8. A control system for monitoring the pressure safety of a gas pipeline according to claim 1, characterized in that, It also includes a pressure gauge (2), which is installed on the gas pipeline (1) downstream of the shut-off valve (6) to detect the gas pressure inside the gas pipeline (1).

9. A control system for monitoring the pressure safety of a gas pipeline according to claim 1, characterized in that, The pressure transmitter (4) is connected to the leak-proof sealing assembly (5) by a manual switch (43), which is used to manually close the gas passage.

10. A control system for monitoring the pressure safety of a gas pipeline according to claim 1, characterized in that, The pressure transmitter (4) also includes a pressure display screen (42) for displaying the pressure value after pressure reduction in real time.

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