An overpressure cut-off system for gas delivery

Abstract

The application relates to an overpressure cut-off system for gas delivery, mainly relates to the field of gas delivery control, and comprises a controller, a first pressure guide pipe and a first guide valve, the first guide valve is installed on the first pressure guide pipe, the first pressure guide pipe is connected with a gas delivery pipeline upstream of an overpressure cut-off mechanism and a driving cavity of the overpressure cut-off mechanism, the first guide valve is electrically connected with the controller, the application further comprises a remote control device in communication connection with the controller, the first pressure guide pipe is provided with a first pressure regulator, which is used for adjusting the gas pressure guided into the driving cavity of the overpressure cut-off mechanism to be between a set pressure value and a maximum working pressure value. The application can actively cut off the gas delivery in special scenes such as fire and maintenance without waiting for overpressure triggering, and improves the safety guarantee level and emergency disposal flexibility of the gas delivery system.

Description

Technical Field

[0001] This application relates to the field of gas transmission control, and in particular to an overpressure cutoff system for gas transmission. Background Technology

[0002] In modern society, natural gas, as a clean and efficient energy source, is widely used in various fields such as residential life, commerce, and industry.

[0003] Currently, gas supply systems typically consist of long-distance gas pipelines, overpressure cut-off mechanisms, pressure regulating equipment, medium and low-pressure distribution networks, and numerous gas user facilities. During gas transmission and use, strict control of gas pressure is necessary to ensure the safe and stable operation of downstream gas equipment. Pressure regulating equipment is a key component in gas supply systems, regulating higher-pressure gas to meet the requirements of user equipment. Figure 1 The diagram shows a partial structural schematic of an existing gas supply system. A pressure guide pipe is installed between the gas pipeline downstream of the pressure regulating equipment and the drive chamber of the overpressure cut-off mechanism. The gas pressure after being regulated by the pressure regulating equipment is fed back to the overpressure cut-off mechanism through the pressure guide pipe. When the gas pressure output downstream of the pressure regulating equipment exceeds the set pressure value of the overpressure cut-off mechanism, the overpressure cut-off mechanism cuts off the gas supply in time to avoid the danger of continuously supplying high-pressure gas to gas user facilities.

[0004] The control of gas supply via feedback from the pressure regulating device after pressure regulation via the pressure guide pipe is a passive overpressure cutoff method. However, this passive overpressure cutoff method has obvious limitations: On the one hand, in special scenarios such as fires or maintenance that require immediate gas supply cutoff, the existing system relies solely on the single trigger condition of "pressure exceeding the set value," which cannot achieve active and rapid cutoff. This may lead to secondary accidents such as gas leaks and fire spread. For example, during pipeline maintenance, workers need to enter the site. If the upstream gas supply cannot be actively cut off at this time, a high-pressure gas leak may cause an explosion if the gas pipeline ruptures due to misoperation. On the other hand, if the pressure regulating device malfunctions and causes an abnormal increase in downstream pressure, and the overpressure cutoff mechanism fails to respond in time due to problems such as pressure guide pipe blockage or feedback delay, it will pose a risk of overpressure damage to gas users' stoves, water heaters, and other equipment, and may even cause gas leaks and explosions, seriously threatening the safety of people's lives and property. Utility Model Content

[0005] To address the problem that the passive overpressure cutoff method in the existing gas supply system cannot actively and quickly cut off gas supply in special scenarios such as fires and maintenance, which leads to safety accidents such as leaks, explosions, personal injury or property damage caused by the continuous supply of gas in special scenarios such as fires and maintenance.

[0006] This application provides an overpressure cutoff system for gas transmission, which adopts the following technical solution: An overpressure cutoff system for gas transmission includes a controller, a first pressure guide pipe, and a first open valve. The first open valve is installed on the first pressure guide pipe. One end of the first pressure guide pipe is connected to a gas transmission pipeline upstream of the overpressure cutoff mechanism, and the other end of the first pressure guide pipe is connected to the drive chamber of the overpressure cutoff mechanism. The first open valve is electrically connected to the controller.

[0007] By adopting the above technical solution, when the gas transmission system is operating normally, the controller controls the first conduction valve to be in the closed state, and the overpressure cut-off mechanism normally conducts gas through the overpressure cut-off valve into the pressure regulating equipment. After the pressure is reduced by the pressure regulating equipment, the gas flows to the user. When maintenance personnel want to repair the gas transmission pipeline or when an accident such as a fire occurs, the gas transmission needs to be shut off. However, at this time, the gas pressure downstream of the pressure regulating equipment has not exceeded the normal threshold. In this case, the controller controls the first conduction valve to open, and the high-pressure gas in the gas transmission pipeline upstream of the overpressure cut-off mechanism is transported to the drive chamber, so that the pressure in the gas transmission pipeline reaches the set pressure value of the overpressure cut-off mechanism, so as to cut off the gas transmission in time, ensure the safety of gas transmission, and avoid safety accidents caused by continuous gas transmission.

[0008] Preferably, it also includes a remote control device, which is communicatively connected to the controller.

[0009] By adopting the above technical solution, the remote control equipment and the controller are connected in communication. When it is necessary to cut off the gas supply, the maintenance personnel send a control signal from the remote control equipment to the controller. After receiving the control signal, the controller controls the first conduction valve to open, so that the pressure value of the high-pressure gas upstream of the overpressure cut-off mechanism is fed back to the drive chamber of the overpressure cut-off mechanism, thereby driving the overpressure cut-off mechanism to cut off the gas supply. This enhances the system's emergency response flexibility, reduces the time delay for on-site handling, and improves the convenience and timeliness of gas supply safety management.

[0010] Preferably, a first pressure regulator is also installed on the first pressure guide pipe. The pressure regulation range of the first pressure regulator is greater than or equal to the set pressure value of the overpressure cut-off mechanism and less than the maximum working pressure value of the overpressure cut-off mechanism.

[0011] By adopting the above technical solution, the first pressure regulator can precisely adjust the gas pressure entering the overpressure cut-off mechanism drive chamber through the first pressure guide pipe, keeping it within a range greater than or equal to the set pressure value of the overpressure cut-off mechanism drive chamber and less than its maximum working pressure value. When it is necessary to actively cut off the gas supply, the first pressure regulator can stabilize the pressure entering the drive chamber above the set pressure value, ensuring that the overpressure cut-off mechanism can operate reliably and cut off the gas in a timely manner. At the same time, it avoids the situation where the drive chamber is subjected to pressure exceeding its maximum working pressure due to excessively high upstream gas pressure, effectively protecting the drive chamber components of the overpressure cut-off mechanism from damage, extending the service life of the overpressure cut-off mechanism, and improving the stability and safety of system operation.

[0012] Preferably, a pressure detection device is also installed on the gas pipeline downstream of the pressure regulating device, and the pressure detection device is electrically connected to the controller.

[0013] By adopting the above technical solution, a pressure detection device is installed on the gas pipeline downstream of the pressure regulating equipment and electrically connected to the controller, allowing real-time monitoring of the pressure within the pipeline. In practical use, when the pressure detection device detects an abnormal pressure, it promptly transmits a signal to the controller, enabling the controller to take appropriate measures according to a preset program. In scenarios requiring gas supply cutoff due to fire or maintenance, the pressure detection device downstream of the pressure regulating equipment monitors the situation in real time. When the controller opens the first open valve, the overpressure cutoff mechanism should cut off the gas supply, and there should be no further gas supply downstream of the pressure regulating equipment. If the pressure detection device at this location detects that there is still gas pressure in the pipeline and that the pressure is within a safe range, it indicates a malfunction in the first open valve and / or the overpressure cutoff mechanism. If the gas pressure is outside the safe range, it indicates a malfunction in both the first open valve and / or the overpressure cutoff mechanism, and also a malfunction in the pressure regulating equipment, thus alerting maintenance personnel to perform repairs.

[0014] Preferably, it also includes a backup pressure guide pipe, which is connected in parallel with the first pressure guide pipe and connects the gas pipeline upstream of the overpressure cut-off mechanism to the drive chamber of the overpressure cut-off mechanism. The backup pressure guide pipe is provided with a second conduction valve and a second pressure regulator, and the pressure regulation range of the second pressure regulator is greater than the set pressure value of the overpressure cut-off mechanism and less than the maximum working pressure value of the overpressure cut-off mechanism. The second conduction valve and the second pressure regulator are both electrically connected to the controller.

[0015] By adopting the above technical solution, the backup pressure guide pipe is connected in parallel with the first pressure guide pipe. When the first control valve is opened to cut off the gas supply, and the pressure detection device installed downstream of the pressure regulating equipment detects that there is still gas pressure in the gas pipeline, indicating that the first pressure guide pipe and the first control valve may be malfunctioning, blocked, or require maintenance and cannot work normally, the controller can control the second control valve to open, enabling the backup pressure guide pipe to be put into use. This allows the overpressure cut-off mechanism to cut off the gas supply, ensuring the reliable implementation of the overpressure cut-off function and avoiding the risk of failing to actively cut off the gas supply due to a single link problem such as blockage of the first pressure guide pipe, failure of the first control valve, or failure of the first pressure regulator. This forms a "main-backup" dual protection mechanism, significantly improving the system's fault tolerance and the reliability of emergency response. At the same time, the pressure regulation range of the second pressure regulator is consistent with that of the first pressure regulator. When the backup pressure guide pipe is put into use, it can also stabilize the gas pressure entering the drive chamber within a range that is greater than the set pressure value of the overpressure cut-off mechanism drive chamber but less than its maximum working pressure value, ensuring the pressure control accuracy of the backup pressure guide pipe during operation and avoiding damage to the drive chamber due to abnormal pressure in the backup path.

[0016] Preferably, the minimum value of the second voltage regulation range is greater than the minimum value of the first voltage regulation range.

[0017] By adopting the above technical solution, it is ensured that the gas pressure output from the backup pressure guide pipe to the drive chamber of the overpressure cut-off mechanism can be stably maintained above the minimum pressure threshold required for the overpressure cut-off mechanism to cut off the gas supply. At the same time, it avoids the problem that the gas pressure introduced into the drive chamber is insufficient to drive the overpressure cut-off mechanism to achieve cut-off, thereby further improving the accuracy of main / backup switching and the reliability of the backup system.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. The first pressure guide pipe, the first conduction valve and the controller work together to flexibly control the overpressure cut-off mechanism according to the actual situation. It can actively trigger overpressure cut-off in special scenarios such as fire and maintenance, which solves the limitation of traditional passive cut-off that only relies on the downstream pressure threshold. It realizes active safety control of gas transmission and effectively avoids accidents such as leakage and explosion caused by continuous gas transmission in special scenarios. 2. The communication connection between the remote control equipment and the controller enables maintenance personnel to trigger overpressure cutoff remotely without having to rush to the site, which greatly shortens the emergency response time and improves the convenience and timeliness of gas safety management; 3. The precise pressure regulation design of the first and second pressure regulators ensures that the gas pressure entering the drive chamber reaches the set value of the overpressure cut-off mechanism to ensure reliable operation, while limiting the pressure to not exceed the maximum working pressure of the drive chamber, thus preventing damage to the drive chamber due to excessive pressure and extending the service life of the overpressure cut-off mechanism. At the same time, the lowest value of the pressure regulation range of the second pressure regulator is higher than that of the first pressure regulator to avoid situations where the gas pressure is insufficient to drive the overpressure cut-off mechanism and thus prevents it from failing to cut off. Attached Figure Description

[0019] Figure 1 This is a partial structural diagram of an existing gas supply system involved in the background technology of this application; Figure 2 This is a schematic diagram of the overall structure of the overpressure cutoff system for gas transmission in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the overall structure of the overpressure cutoff system for gas transmission in Embodiment 2 of this application.

[0020] Reference numerals in the attached diagram: 1. First pressure guide pipe; 2. First open valve; 3. Controller; 4. Remote control device; 5. First pressure regulator; 6. Backup pressure guide pipe; 7. Second open valve; 8. Second pressure regulator; 9. Pressure detection device. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 2 - Appendix Figure 3 This application will be described in further detail.

[0022] This application discloses an overpressure cutoff system for gas transmission.

[0023] Reference Figure 2An overpressure cutoff system for gas transmission includes a first pressure-conducting pipe 1, a first conduction valve 2, a remote control device 4, and a controller 3. The remote control device 4 is communicatively connected to the controller 3. One end of the first pressure-conducting pipe 1 is connected to the gas transmission pipeline upstream of the overpressure cutoff mechanism, and the other end of the first pressure-conducting pipe 1 is connected to the drive chamber of the overpressure cutoff mechanism to introduce high-pressure gas upstream of the overpressure cutoff mechanism into the drive chamber of the overpressure cutoff mechanism. The first conduction valve 2 is installed on the first pressure-conducting pipe 1 to control the opening and closing of the first pressure-conducting pipe 1. The first conduction valve 2 is electrically connected to the controller 3 and can be controlled by the controller 3. The first pressure-conducting pipe 1, the first conduction valve 2, and the controller 3 work together to flexibly control the overpressure cutoff mechanism according to the actual situation. It can flexibly adjust the pressure threshold to adapt to complex and changing gas transmission conditions, avoiding the poor adaptability problem caused by the fixed threshold of simple overpressure protection devices. At the same time, in conjunction with the remote control device 4, it enhances the system's emergency response flexibility, reduces the time delay for on-site handling, and improves the convenience and timeliness of gas transmission safety management.

[0024] Reference Figure 2 A first pressure regulator 5 is also installed on the first pressure guide pipe 1. The pressure regulation range of the first pressure regulator 5 is greater than or equal to the set pressure value of the overpressure cut-off mechanism and less than the maximum working pressure value of the overpressure cut-off mechanism. This ensures that the gas pressure entering the drive chamber of the overpressure cut-off mechanism through the first pressure guide pipe 1 can drive the overpressure cut-off mechanism to work and cut off the gas supply. At the same time, it ensures that the introduced gas pressure will not damage the overpressure cut-off mechanism, thus extending the service life of the overpressure cut-off mechanism and improving the stability and safety of the system operation.

[0025] Reference Figure 2 The controller 3 is a control device that can perform logic programming and signal processing. It can receive signals from various sensors and issue corresponding control commands according to the preset program. It usually has multiple signal input ports and output ports for connecting different devices. The controller 3 can be a PLC controller 3, a microcontroller, etc., as long as it can achieve similar control functions.

[0026] Reference Figure 2 The first pressure-conducting pipe 1 is typically made of metal, such as steel, copper, or stainless steel flexible hoses, which have good pressure resistance and corrosion resistance. Both ends of the first pressure-conducting pipe 1 are connected to the gas pipeline upstream of the overpressure cut-off mechanism and the drive chamber of the overpressure cut-off mechanism through sealing joints, respectively, to ensure that the gas pressure can be accurately transmitted. The second pressure-conducting pipe 6 is made of a similar material to the first pressure-conducting pipe 1. One end of the second pressure-conducting pipe 6 is connected to the gas pipeline downstream of the pressure regulating equipment through a sealing joint, and the other end is connected to the drive chamber of the overpressure cut-off mechanism, so as to introduce the gas pressure downstream of the pressure regulating equipment into the drive chamber to ensure that the gas delivered to the user is safe.

[0027] The implementation principle of this embodiment is as follows: The combination of components such as controller 3, first pressure guide pipe 1, and first open valve 2 enables active control of the overpressure cut-off mechanism. In special scenarios such as fires or maintenance, personnel can control the first open valve 2 to open via controller 3, or input a control signal into the remote control device 4. The remote control device 4 then sends a control signal to controller 3 to open the first open valve 2, introducing the gas pressure in the gas pipeline into the drive chamber of the overpressure cut-off mechanism, causing the mechanism to activate and quickly cut off the gas supply. Simultaneously, the inclusion of the first pressure regulator 5 improves system stability and prevents system failure due to abnormal pressure. Compared to traditional passive overpressure cut-off methods, this significantly enhances the safety and responsiveness of the gas supply system in special scenarios.

[0028] Example 2 The difference between this embodiment and Embodiment 1 is that: Reference Figure 3 A pressure detection device 9 is also installed on the gas pipeline downstream of the pressure regulating equipment. The pressure detection device 9 is electrically connected to the controller 3 and is used to detect the pressure in the gas pipeline in real time. The pressure detection device 9 usually uses a pressure sensor, such as a strain gauge pressure sensor or a piezoresistive pressure sensor. The pressure detection device 9 installed on the gas pipeline downstream of the pressure regulating equipment detects the gas pressure value at the outlet of the pressure regulating equipment in real time and feeds back the detected gas pressure value to the controller 3 in real time. When maintenance is required or gas supply needs to be cut off in scenarios such as fire, the pressure detection device 9 installed downstream of the pressure regulating equipment detects in real time. When the controller 3 controls the first open valve 2 to open, the overpressure cut-off mechanism should cut off the gas supply. There should be no more gas supply downstream of the pressure regulating equipment. If the pressure detection device 9 at this location detects that there is still gas pressure in the gas pipeline and the gas pressure is within the safe range, it indicates that the first open valve 2 and / or the overpressure cut-off mechanism has failed. If the gas pressure is not within the safe range, it indicates that the first open valve 2 and / or the overpressure cut-off mechanism has failed, and the pressure regulating equipment has also failed, thus reminding maintenance personnel to carry out maintenance.

[0029] Reference Figure 3It also includes a backup pressure guide pipe 6, which is connected in parallel with the first pressure guide pipe 1. The backup pressure guide pipe 6 connects the gas pipeline upstream of the overpressure cutoff mechanism to the drive chamber of the overpressure cutoff mechanism. The backup pressure guide pipe 6 is equipped with a second conduction valve 7 and a second pressure regulator 8. The pressure regulation range of the second pressure regulator 8 is greater than or equal to the set pressure value of the overpressure cutoff mechanism and less than the maximum working pressure value of the overpressure cutoff mechanism. The second conduction valve 7 and the second pressure regulator 8 are both electrically connected to the controller 3. The structure and working principle of the backup pressure guide pipe 6 and the second conduction valve 7 are similar to those of the first pressure guide pipe 1 and the first conduction valve 2. When the controller 3 determines the value detected by the pressure detection device 9 installed downstream of the pressure regulating device, it controls the first conduction valve 2 to open and reduce the gas pressure upstream of the overpressure cutoff mechanism. When the gas supply is not cut off in the drive chamber, if the first pressure guide pipe 1 or the first open valve 2 on it malfunctions, the controller 3 can control the second open valve 7 to open, so that the backup pressure guide pipe 6 can be put into use, ensuring that the overpressure cut-off mechanism can continue to work normally. The controller 3 can determine whether the first open valve 2 is faulty by controlling the first open valve 2 to open for a period of time. If the pressure value detected by the pressure detection device 9 installed downstream of the pressure regulating equipment does not change or even increases, the controller 3 will determine that the first open valve 2 is faulty. At this time, the controller 3 can control the second open valve 7 to open to cut off the gas supply and feed back the information of the first open valve 2 malfunction to the remote control device 4 to remind the maintenance personnel to inspect the first open valve 2.

[0030] Meanwhile, the lowest value of the pressure regulation range of the second pressure regulator 8 is greater than the lowest value of the pressure regulation range of the first pressure regulator 5. This is to prevent the overpressure cut-off mechanism from failing to operate when the first pressure regulator 5 adjusts the gas pressure to the lowest value corresponding to its pressure regulation range. For example, the set pressure value of the overpressure cut-off mechanism is 4.5 kPa, the maximum working pressure value of the overpressure cut-off mechanism is 10 kPa, the pressure regulation range of the first pressure regulator 5 is 5 kPa-7 kPa, and the original set value of the overpressure cut-off mechanism is 4.5 kPa. After long-term use, the components of the overpressure cut-off mechanism may experience aging and wear, requiring a greater driving force to operate normally. That is, to avoid the overpressure cut-off mechanism failing to operate with a gas pressure of 5 kPa, the lowest value of the pressure regulation range of the second pressure regulator 8 is set to be higher than the lowest value of the first pressure regulator 5's pressure regulation range. Thus, the pressure regulation range of the second pressure regulator 8 can be 6 kPa-8 kPa, meaning that the lowest output pressure value after the second pressure regulator 8 adjusts the pressure is 6 kPa, ensuring that the overpressure cut-off mechanism can obtain sufficient driving pressure.

[0031] The implementation principle of this embodiment is as follows: Based on Example 1, a backup pressure guide pipe 6 is added. The backup pressure guide pipe 6 is equipped with a second open valve 7 and a second pressure regulator 8. A pressure detection device 9 is installed on the gas pipeline downstream of the pressure regulator. The pressure detection device 9 monitors the gas pressure in the gas pipeline in real time and feeds back the detected pressure value to the controller 3. When maintenance personnel need to repair the gas delivery system due to a fire, they control the first open valve 2 to open. The gas pressure upstream of the overpressure cut-off mechanism, after being regulated by the first pressure regulator 5, is input into the drive chamber of the overpressure cut-off mechanism to drive it to cut off the gas delivery. The pressure detection device 9 feeds back the gas pressure in the gas pipeline to the controller 3 in real time. The controller 3 determines whether the gas delivery has been cut off based on the current gas pressure value in the gas pipeline fed back by the pressure detection device 9. If it is determined that the gas delivery has not been cut off and the gas pressure value is within a safe range, the controller controls the second open valve 7 on the backup pipe to open, causing the overpressure... The gas pressure upstream of the shut-off mechanism is regulated by the second pressure regulator 8 and then input into the drive chamber, thereby driving the overpressure drive mechanism to work and realize the gas supply. At the same time, the information that the first conduction valve 2 may be malfunctioning is fed back to the remote control device 4 to remind the operation and maintenance personnel to carry out maintenance. If it is determined that the gas supply is not currently shut off and the gas pressure value is not within the safe range, the second conduction valve 7 on the control backup pipeline is opened to drive the overpressure drive mechanism to work and shut off the gas supply. At the same time, the information that the pressure regulating device may be malfunctioning is also fed back to the remote control device 4 to remind the operation and maintenance personnel to shut off the gas supply from the source in time to ensure the safety of the gas supply system.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An overpressure cutoff system for gas transmission, characterized in that: It includes a controller (3), a first pressure guide pipe (1) and a first open valve (2). The first open valve (2) is installed on the first pressure guide pipe (1). One end of the first pressure guide pipe (1) is connected to the gas pipeline upstream of the overpressure cut-off mechanism, and the other end of the first pressure guide pipe (1) is connected to the drive chamber of the overpressure cut-off mechanism. The first open valve (2) is electrically connected to the controller (3).

2. The overpressure cutoff system for gas transmission according to claim 1, characterized in that: It also includes a remote control device (4), which is communicatively connected to the controller (3).

3. The overpressure cutoff system for gas transmission according to claim 1, characterized in that: The first pressure guide tube (1) is also equipped with a first pressure regulator (5). The first pressure regulation range of the first pressure regulator (5) is greater than or equal to the set pressure value of the overpressure cut-off mechanism and less than the maximum working pressure value of the overpressure cut-off mechanism.

4. The overpressure cutoff system for gas transmission according to claim 3, characterized in that: A pressure detection device (9) is also installed on the gas pipeline downstream of the pressure regulating device, and the pressure detection device (9) is electrically connected to the controller (3).

5. The overpressure cutoff system for gas transmission according to claim 4, characterized in that: It also includes a backup pressure guide pipe (6), which is connected in parallel with the first pressure guide pipe (1). The backup pressure guide pipe (6) is connected to the gas pipeline upstream of the overpressure cut-off mechanism and the drive chamber of the overpressure cut-off mechanism. The backup pressure guide pipe (6) is provided with a second conduction valve (7) and a second pressure regulator (8). The second pressure regulation range of the second pressure regulator (8) is greater than the set pressure value of the overpressure cut-off mechanism and less than the maximum working pressure value of the overpressure cut-off mechanism. The second conduction valve (7) and the second pressure regulator (8) are both electrically connected to the controller (3).

6. The overpressure cutoff system for gas transmission according to claim 5, characterized in that: The minimum value of the second voltage regulation range is greater than the minimum value of the first voltage regulation range.

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