Pipeline overcurrent and overpressure protection devices, flame arresters and rectifiers

Abstract

This invention relates to the field of gas pipeline safety protection equipment, and discloses a pipeline overcurrent and overpressure protection device, a flame arrester, and a rectifier. The device includes: a housing with an inlet at one end and an outlet at the other end, containing a first cavity and a second cavity, with a first hole and a second hole formed between the first and second cavities; a sealing element slidably disposed within the housing, one end connected to a first spring; and a pressure relief valve disposed on the side wall of the housing, its inner end extending to the second hole for controlling the opening and closing of the second hole. When the upstream gas pressure of the housing exceeds a preset downstream gas pressure value, the sealing element, pushed by the airflow, overcomes the force of the first spring and seals the first hole, maintaining a sealed state and cutting off downstream gas delivery. This pipeline overcurrent and overpressure protection device is integrated into the flame arrester and rectifier, enabling flame arrest and rectification while also cutting off gas delivery in the event of overpressure or overcurrent in the pipeline.

Description

Technical Field

[0001] This invention relates to the field of gas pipeline safety protection equipment technology, specifically to a pipeline overcurrent and overpressure protection device, a flame arrester, and a rectifier. Background Technology

[0002] To prevent backfire accidents during gas combustion, flame arresters are typically installed on pipelines to prevent flame propagation throughout the pipeline network in the event of gas pressure loss. However, flame arresters cannot detect and cut off gas supply in the event of open leaks such as gas overpressure, overflow, or pipeline rupture.

[0003] Currently, the main measures to prevent gas accidents caused by gas overpressure or overflow are to install pressure sensors and emergency shut-off valves on gas pipelines. The pressure sensor measures the gas pressure, and when the pressure is too high or too low, the controller sends a command to the shut-off valve to cut off the gas supply. The disadvantages of this method are: 1. Requires a power supply: Implementation is difficult and costly in areas unsuitable for power distribution; 2. High failure rate: Failure of the pressure sensor or controller, or power outage, can cause the shut-off function to fail or erroneously activate; 3. High cost: The cost of a stable pressure transmitter, controller, and emergency shut-off valve is at least tens of thousands of yuan, and for large-diameter pipelines, it can even exceed hundreds of thousands of yuan.

[0004] Furthermore, to ensure the safe transport of gas through pipelines, ultrasonic flow meters are typically used to monitor the gas flow rate in real time. However, in actual industrial applications, numerous factors severely restrict the full functionality of ultrasonic flow meters. Firstly, the ubiquitous elbows, valves, and joints in pipeline systems cause extremely uneven gas velocity distribution. To stabilize the gas flow and ensure measurement accuracy, a straight pipe section at least 10 times the pipe diameter is usually installed upstream of the flow meter, and at least 5 times the pipe diameter downstream. However, in space-constrained industrial settings, excessively long straight pipe sections are often difficult to implement, significantly limiting the application range of ultrasonic flow meters. Secondly, commonly used regulating valves in industrial production convert mechanical energy into acoustic energy due to gas throttling, generating high-frequency noise. This noise frequency is similar to the operating frequency of the ultrasonic flow meter, severely interfering with the reception and processing of ultrasonic signals, significantly reducing the flow meter's measurement accuracy, and in extreme cases, even causing the flow meter to malfunction. Traditional methods that rely on noise suppression algorithms to eliminate interference are ineffective at suppressing noise caused by throttling components inside pipes. Summary of the Invention

[0005] This invention was made to solve the above-mentioned technical problems. One of its objectives is to provide a pipeline overcurrent and overpressure protection device that can cut off the gas supply when overpressure or overcurrent occurs in the pipeline.

[0006] Another objective of this invention is to provide a flame arrester that, while achieving the flame arresting function, can quickly cut off the gas supply when there are situations such as excessively high or low gas pressure or gas pipeline rupture.

[0007] Another objective of this invention is to provide a rectifier that can cut off the gas supply when overpressure or overflow occurs in the pipeline, and can also rectify the airflow in the pipeline to reduce noise, thereby creating a stable measurement environment for the ultrasonic flow meter on the pipeline and indirectly improving the accuracy of flow measurement.

[0008] According to one embodiment of the present invention, a pipeline overcurrent and overpressure protection device is provided, comprising: a housing having an air inlet at one end and an air outlet at the other end, and having a first cavity and a second cavity formed therein, with a first hole and a second hole formed between the first cavity and the second cavity; a sealing member slidably disposed within the housing, one end of which is connected to a first spring; and a pressure relief valve disposed on the side wall of the housing, with its inner end extending to the second hole for controlling the opening and closing of the second hole; wherein when the difference between the upstream and downstream air pressures of the housing is less than a preset value, the sealing member is subjected to the thrust of the airflow and the force of the first spring to be equal or substantially equal, and the sealing member maintains a certain distance from the first hole to maintain the downstream gas supply; when the upstream air pressure of the housing is higher than the preset value of the downstream air pressure, the sealing member is pushed by the airflow to overcome the force of the first spring and seals the first hole and remains in a sealed state, cutting off the downstream gas supply.

[0009] In one embodiment, a guide rod is fixedly provided in the housing, and the seal is slidably disposed on the guide rod.

[0010] In one embodiment, the seal is a ball fitted onto the guide rod.

[0011] In one embodiment, the first spring is a compression spring located downstream of the seal and sleeved on the guide rod, with one end of it away from the seal fixed to the guide rod; or the first spring is a tension spring located upstream of the seal and sleeved on the guide rod, with one end of it away from the seal fixed to the guide rod.

[0012] In one embodiment, the pressure relief valve includes: a valve seat having an exhaust port communicating with the second hole; a pressure relief push rod slidably disposed in the valve seat and the side wall of the housing; a sealing gasket sleeved on the pressure relief push rod; and a second spring disposed in the valve seat, applying a force to the pressure relief push rod to cause the sealing gasket to block the exhaust port; wherein, when the pressure relief push rod slides into the housing, the sealing gasket releases the blockage of the exhaust port.

[0013] In one embodiment, the exhaust port includes an exhaust inlet, an exhaust outlet, and a pilot hole. The exhaust inlet is connected to the second hole, the exhaust outlet is connected to the second cavity near the downstream side, and the pilot hole is disposed between the exhaust inlet and the exhaust outlet. After being subjected to the force of the second spring, the pressure relief push rod drives the sealing gasket to seal the pilot hole.

[0014] In one embodiment, the pressure relief valve includes: a lead screw threadedly connected to the side wall of the housing; and a plug fixedly disposed at the inner end of the lead screw, opposite to the second hole; wherein when the lead screw rotates to move into the housing, the plug seals the second hole; and when the lead screw rotates to move out of the housing, the plug releases the seal on the second hole.

[0015] According to one embodiment of the present invention, a flame arrester is provided, comprising: a pipeline overcurrent and overpressure protection device as described above; a first flame arrester fixed in the first cavity; and a second flame arrester fixed in the second cavity.

[0016] In one embodiment, when a guide rod is provided inside the housing, both ends of the guide rod are fixed to the first fire-resistant mesh and the second fire-resistant mesh, respectively.

[0017] In one embodiment, the diameter of the middle part of the flame arrester is larger than the diameter of the air inlet and the air outlet.

[0018] According to one embodiment of the present invention, a rectifier is provided, comprising: a pipeline overcurrent and overpressure protection device as described above; a downstream noise reduction block, fixedly disposed in the second cavity located downstream, having a mesh structure; and a flow stabilizing tube bundle, disposed downstream of the downstream noise reduction block, consisting of a plurality of tubes filling the second cavity, the tubes being arranged along the length direction of the second cavity.

[0019] In one embodiment, the rectifier further includes an upstream noise reduction block, which is fixedly disposed in the first cavity located upstream, and has a noise reduction block filter screen in the middle that is opposite to the air inlet.

[0020] In one embodiment, when a guide rod is provided inside the housing, one end of the guide rod is fixed to the upstream noise reduction block.

[0021] In one embodiment, the upstream noise reduction block further includes a support rod, one end of which is connected to the filter screen of the noise reduction block, and the other end is connected to the inner wall of the first cavity.

[0022] Based on the above description and practical application, the pipeline overcurrent and overpressure protection device of this invention utilizes a first spring and a slidingly mounted seal within the housing. When gas flows within the device, the seal is balanced or nearly balanced by the thrust of the airflow and the force of the first spring, maintaining a certain distance between the seal and the first hole to ensure downstream gas delivery. When the upstream gas pressure exceeds a preset downstream gas pressure, the seal overcomes the force of the first spring and seals the first hole, maintaining a blocked state and cutting off downstream gas delivery. Therefore, when this device is applied to a gas delivery pipeline, if overpressure occurs upstream or overcurrent occurs downstream, the seal sliding onto the first hole can cut off downstream gas delivery, ensuring pipeline safety. Adjusting the pressure relief valve subsequently balances or brings the upstream and downstream gas pressures of the device to near equilibrium, allowing the first spring to remove the seal from the first hole and restore gas flow. This pipeline overcurrent and overpressure protection device ensures the safe delivery of gas in the pipeline. This pipeline overcurrent and overpressure protection device requires no power supply during its entire operation. Furthermore, the device has a simple structure, is not prone to failure, has good stability, will not experience accidental cut-off, and has a low manufacturing cost.

[0023] The flame arrester of this invention integrates the above-mentioned pipeline overcurrent and overpressure protection device, combining the flame arresting function and the shut-off function into one, saving equipment installation space on the pipeline site, reducing costs, and solving the needs of gas flame arrest and shut-off.

[0024] The rectifier in this invention integrates the aforementioned pipeline overcurrent and overpressure protection device, combining rectification and shut-off functions into one, resulting in more accurate ultrasonic metering on the pipeline. The built-in spherical seal not only provides rectification and noise reduction but also automatically shuts off the airflow in case of overcurrent or overpressure. Integrating multiple functions into a single structure, it can be widely used in industrial gas pipelines, eliminating the need for pre-reserved 5D to 10D straight pipe sections, saving installation space and reducing costs. Using this rectifier achieves multiple functions including noise reduction, rectification, and shut-off, ensuring that the ultrasonic flow meter on the pipeline not only provides accurate measurement but also safety protection. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of the flame arrester in normal working condition according to Embodiment 1 of the present invention.

[0026] Figure 2 This is a schematic diagram of the internal structure of the flame arrester in the state of cutting off airflow, as described in Embodiment 1 of the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the flame arrester involved in Embodiment 1 of the present invention during pressure relief operation.

[0028] Figure 4 This is a schematic diagram of the internal structure of the pressure relief valve in the flame arrester involved in Embodiment 1 of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of the first flame arrestor mesh in the flame arrester involved in Embodiment 1 of the present invention.

[0030] Figure 6 for Figure 5 A schematic diagram of the structure of section AA in the middle.

[0031] Figure 7 This is a schematic diagram of the internal structure of the rectifier in normal operation according to Embodiment 2 of the present invention.

[0032] Figure 8 This is a schematic diagram of the internal structure of the rectifier in the second embodiment of the present invention when the airflow is cut off.

[0033] Figure 9 This is a schematic diagram of the internal structure of the rectifier involved in Embodiment 2 of the present invention during pressure relief operation.

[0034] Figure 10 This is a schematic diagram of the upstream noise reduction block in the rectifier involved in Embodiment 2 of the present invention.

[0035] The attached figures are labeled as follows:

[0036] 1. Housing; 11. Air inlet; 12. Air outlet; 13. First cavity; 14. Second cavity; 15. Partition; 16. First hole; 17. Second hole; 21. Seal; 22. First spring; 23. Guide rod; 3. Pressure relief valve; 31. Valve seat; 32. Pressure relief push rod; 33. Sealing gasket; 34. Second spring; 35. Exhaust hole; 351. Exhaust inlet; 352. Pilot hole; 353. Exhaust outlet; 36. Protective cap; 37. Lead screw; 38. Plug; 41. First flame arrestor mesh; 42. Second flame arrestor mesh; 51. Downstream noise reduction block; 52. Flow stabilizing tube bundle; 53. Upstream noise reduction block; 531. Noise reduction block filter; 532. Support rod. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0038] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention.

[0039] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Example 1

[0041] like Figures 1 to 6 As shown in the figure, a flame arrester is disclosed in this embodiment, which integrates a pipeline overcurrent and overpressure protection device. Compared with traditional flame arresters, it not only has a flame arresting function, but also can cut off the airflow in time when there is overpressure upstream of the pipeline or when the downstream air pressure drops due to overflow in the pipeline, so as to keep the pipeline in a safe state.

[0042] First, the pipeline overcurrent and overpressure protection device is described. This device includes a housing 1, a seal 21, a first spring 22, and a pressure relief valve 3. One end of the housing 1 has an air inlet 11 for connecting to the upstream gas supply pipeline, and the other end has an air outlet 12 for connecting to the downstream pipeline. Inside the housing 1, a first cavity 13 and a second cavity 14 are formed, with a first hole 16 and a second hole 17 formed between them. An annular partition 15 is installed inside the housing 1, dividing the internal space into two parts, namely the first cavity 13 and the second cavity 14. The first hole 16 and the second hole 17 are located on the partition 15, allowing communication between the first cavity 13 and the second cavity 14. The housing 1 serves as both the outer shell of the pipeline overcurrent and overpressure protection device and the outer shell of a flame arrester.

[0043] The seal 21 is slidably disposed within the housing 1, with one end connected to the first spring 22. The first spring 22 extends and retracts accordingly as the seal 21 slides. The seal 21 is opposite to the first hole 16; when the seal 21 slides onto the first hole 16, it can seal the first hole 16, blocking the flow of gas between the first cavity 13 and the second cavity 14.

[0044] Specifically, in this embodiment, the seal 21 is slidably disposed in the first cavity 13 near the air inlet 11. The first spring 22 is a compression spring, the main body of which is disposed in the second cavity 14, the right end of which is fixed in the second cavity 14, and the left end passes through the first hole 16 and is fixedly connected to the seal 21.

[0045] The pressure relief valve 3 is located on the side wall of the housing 1, and its inner end extends to the second hole 17 for controlling the opening and closing of the second hole 17. When the pressure relief valve 3 is open, the first chamber 13 and the second chamber 14 can communicate through the second hole 17; when the pressure relief valve 3 is closed, the second hole 17 is closed.

[0046] During operation, when the difference between the upstream and downstream air pressures of the housing 1 is less than a preset value, the sealing element 21 is level or nearly level with the force of the airflow and the force of the first spring 22, and the sealing element 21 maintains a certain distance from the first hole 16, thus ensuring the gas is transported downstream. When the upstream air pressure of the housing 1 is higher than the preset value of the downstream air pressure, the sealing element 21 is pushed by the airflow to overcome the force of the first spring 22 and seals the first hole 16, maintaining the sealed state and cutting off the downstream gas transport.

[0047] When the upstream air pressure of the casing 1 exceeds the preset downstream air pressure, it corresponds to an overpressure situation in the upstream pipeline of the flame arrester, or an overflow situation in the pipeline, such as a downstream rupture and pressure loss. In this case, the seal 21 can promptly seal the first hole 16 to prevent a safety accident. After the pipeline maintenance is completed, the device will continue to maintain the state of cutting off the airflow. The seal 21 will not automatically release the seal on the first hole 16. At this time, gradually opening the pressure relief valve 3 will connect the first chamber 13 and the second chamber 14, so that the air pressure upstream and downstream of the flame arrester is equal or basically equal. The first spring 22 applies a force to the seal 21, which will push the seal 21 to the left, so that the seal 21 releases the seal on the first hole 16, and the gas can flow smoothly and be transported downstream.

[0048] It should be noted that although this pipeline overcurrent and overpressure protection device, relying on the specific structure of the housing 1 and the cooperation of the first spring 22 and the seal 21, can cut off the downstream gas supply during overpressure and overcurrent, these technical features alone cannot restore the gas supply after pipeline maintenance, i.e., it cannot achieve the basic function of gas transmission. Therefore, a pressure relief valve 3 is also provided in this pipeline overcurrent and overpressure protection device, which allows the user to adjust the pressure difference between the upstream and downstream of the device after pipeline maintenance, so that the seal 21 can release the blockage of the first hole 16, ensuring that the gas can be transmitted normally. In other words, in the pipeline overcurrent and overpressure protection device, there is a close connection between the housing 1, the first spring 22, the seal 21, and the pressure relief valve 3. Through their synergistic effect, they jointly solve the technical problem of how to cut off and restore the gas flow during overcurrent and overpressure, producing a related technical effect, namely, ensuring the safe transmission of gas in the pipeline. Removing any of these features will not produce the aforementioned technical effect of safely transmitting gas.

[0049] The pipeline overcurrent and overpressure protection device in this flame arrester utilizes a first spring 22 and a slidingly mounted seal 21 within the housing 1. When gas flows within the device, the seal 21 is leveled or nearly leveled by the thrust of the airflow and the force of the first spring 22, maintaining a certain distance between the seal 21 and the first hole 16, thus ensuring downstream gas flow. When the upstream gas pressure of the housing 1 exceeds a preset downstream gas pressure value, the seal 21, pushed by the airflow, overcomes the force of the first spring 22 and seals the first hole 16, maintaining this sealing state and cutting off downstream gas flow. Therefore, when this device is applied to a gas pipeline, if overpressure occurs upstream or overcurrent occurs downstream, the seal 21 sliding onto the first hole 16 can cut off downstream gas flow, ensuring a safe pipeline condition. Adjusting the pressure relief valve 3 subsequently levels or nearly equals the upstream and downstream gas pressures, allowing the first spring 22 to remove the seal 21 from the first hole 16, restoring gas flow. This pipeline overcurrent and overpressure protection device ensures the safe transport of gas in the pipeline. The device requires no power supply during operation, has a simple structure, is not prone to failure, exhibits good stability, does not accidentally trip, and has low manufacturing costs.

[0050] In this embodiment, the flame arrester combines the flame-arresting and fire-stopping functions into one. Specifically, its flame-arresting function is achieved by a first flame-arresting mesh 41 and a second flame-arresting mesh 42 disposed within the housing 1. Figures 1 to 6 As shown, the first flame arrestor 41 is fixed in the first cavity 13, and the second flame arrestor 42 is fixed in the second cavity 14. Both the first flame arrestor 41 and the second flame arrestor 42 include several continuously bent, annular steel sheets and several rings. The steel sheets and rings are spaced apart to form a disc-shaped structure, which can block or slow down the spread of flames by its own structure.

[0051] In this embodiment, a certain distance is provided between the first fire-resistant mesh 41 and the second fire-resistant mesh 42, which can be used to set up structures related to the cutting-off function, and can also increase the fire-resistant distance and improve the fire-resistant effect.

[0052] In this embodiment, the diameter of the middle part of the flame arrester is larger than the diameters of the air inlet 11 and the air outlet 12. For example... Figure 1 As shown, the middle section of housing 1 is enlarged compared to the left and right ends, increasing the storage space for impurities after gas filtration. This also facilitates the installation of structures related to the cut-off function and allows it to be integrated with the flame arrester. Compared to separate assembly, this reduces the overall installation size, enhances the flame-arresting and cut-off effect, and prevents the spread of fire.

[0053] In this embodiment, a guide rod 23 is fixedly provided in the housing 1, and the sealing member 21 is slidably disposed on the guide rod 23. The first spring 22 is sleeved on the guide rod 23, which can ensure that the sealing member 21 slides smoothly in the housing 1. The two ends of the guide rod 23 are respectively fixed on the first flame arrestor 41 and the second flame arrestor 42, which can achieve the fixation of the guide rod 23 by means of the existing necessary structure, without adding structural components to the housing 1.

[0054] The sealing element 21 is a sphere mounted on the guide rod 23. In actual use, the sealing element 21 can only slide along the length of the guide rod 23 and will not move in other directions, ensuring stable sealing of the first hole 16 under set conditions. Furthermore, the spherical shape of the sealing element 21 facilitates gas flow within the pipeline and the flame arrester, and also allows for successful sealing of the first hole 16 even with a large pressure difference between the upstream and downstream sides. The guide rod 23 and the sealing element 21 are centrally located in the middle of the housing 1, further increasing the gas flow rate and the reaction speed for sealing the first hole 16 when the pressure difference between the upstream and downstream sides is large.

[0055] In some embodiments, the guide rod 23 can also be directly fixed to the inner wall of the housing 1, which can also guide the seal 21 to slide within the housing 1. Alternatively, the seal 21 can be directly slidably connected to the inner wall of the housing 1, ensuring that the seal 21 can seal the first hole 16 when sliding. For example, multiple grooves can be provided on the inner wall of the housing 1, and the side of the seal 21 can be slidably fitted into these grooves through a connector to achieve sliding within the housing 1.

[0056] In some embodiments, the sealing element 21 may also be a non-spherical object, such as a cylinder, round tube, ellipse, cuboid, etc., with a plane or arc surface opposite to the first hole 16 at one end, all of which can achieve the purpose of sealing the first hole 16.

[0057] In some embodiments, the first spring 22 may be disposed in the first cavity 13 and configured as a tension spring. One end of the first spring 22 is connected to the end of the seal 21 away from the first hole 16, while the other end of the first spring 22 is fixed. When the seal 21 is pushed by the airflow, the first spring 22 is stretched. The tension of the first spring 22 is equal to or substantially equal to the thrust of the seal 21 by the airflow, which ensures that a certain distance is maintained between the seal 21 and the first hole 16, thus maintaining the flow of airflow. When the upstream air pressure exceeds the preset value of the downstream air pressure, the thrust exerted by the airflow on the seal 21 increases significantly, which can press the seal 21 tightly against the first hole 16 to cut off the airflow.

[0058] In the above embodiments, the first cavity 13 is located near the upstream air supply end, so the sealing member 21 is disposed in the first cavity 13 to achieve the above-mentioned functions such as cutting off airflow. When the second cavity 14 is located near the upstream air supply end, the sealing member 21 can be disposed in the second cavity 14, and the above-mentioned functions such as cutting off airflow can also be achieved.

[0059] In this embodiment, one structural form of the pressure relief valve 3 is disclosed. Please refer to [reference needed]. Figures 1 to 4 The pressure relief valve 3 includes a valve seat 31, a pressure relief push rod 32, a sealing gasket 33, and a second spring 34. The valve seat 31 is mounted on a partition plate 15 and has an exhaust port 35 communicating with a second hole 17. The pressure relief push rod 32 is slidably disposed within the side walls of the valve seat 31 and the housing 1, with one end extending outside the housing 1, allowing it to slide along its length under external force. A sealing structure is provided between the pressure relief push rod 32 and the housing 1, as well as between the pressure relief push rod 32 and the valve seat 31, preventing gas from flowing out from the gaps between the pressure relief push rod 32 and the housing 1 and valve seat 31. The exhaust port 35 has a curved structure, and the sealing gasket 33 is fitted onto the pressure relief push rod 32, with the side of the sealing gasket 33 facing the central channel of the exhaust port 35. The second spring 34 is disposed in the valve seat 31 and applies a force to the pressure relief push rod 32, causing the sealing gasket 33 to seal the central channel of the exhaust port 35.

[0060] Specifically, the second spring 34 is a compression spring, one end of which abuts against the inner end of the pressure relief push rod 32, applying a force towards the outside of the housing 1 to the pressure relief push rod 32. This causes the sealing gasket 33 to press tightly against the middle channel of the exhaust port 35, thus sealing the exhaust port 35 and preventing the first cavity 13 and the second cavity 14 from communicating with the exhaust port 35 through the second hole 17. When pressure relief is required, simply overcome the elastic force of the second spring 34 and slide the pressure relief push rod 32 into the housing 1. The sealing gasket 33 will then move away from the middle channel of the exhaust port 35, allowing gas to flow through the exhaust port 35. The high-pressure gas in the first cavity 13 can then enter the second cavity 14 until the pressure in the two cavities is equal or nearly equal. At this point, the seal 21 will automatically open under the force of the first spring 22, releasing the seal on the first hole 16. By setting the pressure relief valve 3, the dangerous situation of downstream end users turning on gas before the overpressure state is relieved is avoided.

[0061] The pressure relief valve 3, seal 21, guide rod 23 and other structures are made of stainless steel or other high-temperature resistant materials, which can reliably cut off the airflow while having good fire resistance and wear resistance, and there is no risk of air leakage, thus providing higher safety performance.

[0062] In this embodiment, the exhaust port 35 includes an exhaust inlet 351, an exhaust outlet 353, and a pilot hole 352. The exhaust inlet 351 is connected to the second hole 17, and the exhaust outlet 353 is connected to the downstream second cavity 14. The pilot hole 352 is located between the exhaust inlet 351 and the exhaust outlet 353, i.e., the middle channel of the exhaust port 35. After being acted upon by the second spring 34, the pressure relief push rod 32 drives the sealing gasket 33 to seal the pilot hole 352.

[0063] When depressurizing, after pressing the depressurization push rod 32, the airflow first enters the pilot hole 352 through the exhaust inlet 351, and the pressure on the exhaust outlet 353 side increases. At the same time as the external force, the sealing gasket 33 is lowered until the sealing gasket 33 is completely lowered. The airflow flows through the upper side of the sealing gasket 33 to the exhaust outlet 353, and the air pressure on both sides can be made consistent. The seal 21 is automatically opened by the thrust of the first spring 22, avoiding the dangerous situation of downstream end users turning on gas before the overpressure state is relieved.

[0064] In this embodiment, the pressure relief valve 3 also includes a protective cap 36 sleeved on the outer end of the pressure relief push rod 32, which can protect the pressure relief push rod 32 and prevent external accidental contact with the pressure relief push rod 32, thus affecting the cut-off function of the device.

[0065] The flame arrester in this embodiment, based on traditional flame arrester technology, achieves flame arrest and gas cut-off functions in case of overflow and overpressure by modifying its internal structure and construction, incorporating a first spring 22, a seal 21, and other mechanisms. When the gas pressure and flow rate in the pipeline fluctuate within a certain range, the gas can pass smoothly through the flame arrester thanks to the force balance between the first spring 22 and the seal 21. When a rupture or pressure loss occurs downstream of the pipeline, causing overflow, or when a malfunction of the upstream pressure regulating valve causes a rapid increase in pressure in the upstream pipeline, the force balance between the first spring 22 and the seal 21 is broken, and the seal 21 can quickly move to the first hole 16, cutting off the downstream gas flow. This solves the problem of achieving the functions currently required by four products: traditional flame arresters, pressure transmitters, emergency shut-off valves, and controllers. It also reduces costs by approximately 90%, eliminates the need for external power supply, and avoids accidental shut-off events.

[0066] This flame arrester can be used not only in industrial sites with large-diameter gas inlets, but also in catering and canteen industries before gas pipelines enter buildings. By combining the traditional flame arrester and shut-off valve into one unit, it saves space by eliminating the need for two separate devices on-site. It also solves the problems of high cost and accidental shut-off associated with traditional flame arresters and shut-off valves, enabling the simultaneous fulfillment of gas flame arrest and shut-off requirements. Example 2

[0067] like Figures 7 to 10As shown in the figure, a rectifier is disclosed in this embodiment, which integrates a pipeline overcurrent and overpressure protection device. Compared with traditional rectifiers, it not only has a rectification function, but also can cut off the airflow in time when there is an overpressure situation upstream of the pipeline or when the gas pressure drops downstream due to an overcurrent situation in the pipeline, so as to keep the pipeline in a safe state.

[0068] First, the pipeline overcurrent and overpressure protection device is described. This device includes a housing 1, a seal 21, a first spring 22, and a pressure relief valve 3. One end of the housing 1 has an air inlet 11 for connecting to the upstream gas supply pipeline, and the other end has an air outlet 12 for connecting to the downstream pipeline. Inside the housing 1, a first cavity 13 and a second cavity 14 are formed, with a first hole 16 and a second hole 17 formed between them. A cylindrical partition 15 is installed inside the housing 1, dividing the internal space into two parts, namely the first cavity 13 and the second cavity 14. The first hole 16 is one port of the cylindrical partition 15, and the second hole 17 is located on the partition 15, allowing communication between the first cavity 13 and the second cavity 14. The housing 1 serves as both the outer shell of the pipeline overcurrent and overpressure protection device and the outer shell of the rectifier.

[0069] The seal 21 is slidably disposed within the housing 1, with one end connected to the first spring 22. The first spring 22 extends and retracts accordingly as the seal 21 slides. The seal 21 is opposite to the first hole 16; when the seal 21 slides onto the first hole 16, it can seal the first hole 16, blocking the flow of gas between the first cavity 13 and the second cavity 14.

[0070] Specifically, in this embodiment, the seal 21 is slidably disposed within the first cavity 13 near the air inlet 11. The first spring 22 is a tension spring disposed within the first cavity 13, with its left end fixed in the first cavity 13 and its right end fixedly connected to the seal 21.

[0071] The pressure relief valve 3 is located on the side wall of the housing 1, and its inner end extends to the second hole 17 for controlling the opening and closing of the second hole 17. When the pressure relief valve 3 is open, the first chamber 13 and the second chamber 14 can communicate through the second hole 17; when the pressure relief valve 3 is closed, the second hole 17 is closed.

[0072] During operation, when the difference between the upstream and downstream air pressures of the housing 1 is less than a preset value, the sealing element 21 is level or nearly level with the force of the airflow and the force of the first spring 22, and the sealing element 21 maintains a certain distance from the first hole 16, thus ensuring the gas is transported downstream. When the upstream air pressure of the housing 1 is higher than the preset value of the downstream air pressure, the sealing element 21 is pushed by the airflow to overcome the force of the first spring 22 and seals the first hole 16, maintaining the sealed state and cutting off the downstream gas transport.

[0073] When the upstream air pressure of housing 1 exceeds the preset downstream air pressure, it corresponds to an overpressure situation in the upstream pipeline of the rectifier, or an overflow situation in the pipeline, such as a downstream rupture and pressure loss. In this case, the seal 21 can promptly seal the first hole 16 to prevent a safety accident. After the pipeline maintenance is completed, the device will continue to maintain the state of cutting off the airflow. The seal 21 will not automatically release the seal on the first hole 16. At this time, the pressure relief valve 3 is gradually opened to connect the first chamber 13 and the second chamber 14, so that the air pressure upstream and downstream of the rectifier is equal or basically equal. The first spring 22 applies a force to the seal 21, which pulls the seal 21 to the left, so that the seal 21 releases the seal on the first hole 16, and the gas can flow smoothly and be transported downstream.

[0074] It should be noted that although this pipeline overcurrent and overpressure protection device, relying on the specific structure of the housing 1 and the cooperation of the first spring 22 and the seal 21, can cut off the downstream gas supply during overpressure and overcurrent, these technical features alone cannot restore the gas supply after pipeline maintenance, i.e., it cannot achieve the basic function of gas transmission. Therefore, a pressure relief valve 3 is also provided in this pipeline overcurrent and overpressure protection device, which allows the user to adjust the pressure difference between the upstream and downstream of the device after pipeline maintenance, so that the seal 21 can release the blockage of the first hole 16, ensuring that the gas can be transmitted normally. In other words, in the pipeline overcurrent and overpressure protection device, there is a close connection between the housing 1, the first spring 22, the seal 21, and the pressure relief valve 3. Through their synergistic effect, they jointly solve the technical problem of how to cut off and restore the gas flow during overcurrent and overpressure, producing a related technical effect, namely, ensuring the safe transmission of gas in the pipeline. Removing any of these features will not produce the aforementioned technical effect of safely transmitting gas.

[0075] The pipeline overcurrent and overpressure protection device in this rectifier utilizes a first spring 22 and a slidingly mounted seal 21 within the housing 1. When gas flows within the device, the seal 21 is leveled or nearly leveled by the thrust of the airflow and the force of the first spring 22, maintaining a certain distance between the seal 21 and the first hole 16 to ensure downstream gas flow. When the upstream gas pressure of the housing 1 exceeds a preset downstream gas pressure value, the seal 21 is pushed by the airflow to overcome the force of the first spring 22 and seals the first hole 16, maintaining the sealed state and cutting off downstream gas flow. Therefore, when this device is applied to a gas pipeline, if overpressure occurs upstream or overflow occurs downstream, the seal 21 sliding onto the first hole 16 can cut off downstream gas flow, ensuring a safe pipeline condition. Adjusting the pressure relief valve 3 subsequently levels or nearly levels the upstream and downstream gas pressures, allowing the first spring 22 to remove the seal 21 from the first hole 16, restoring gas flow. This pipeline overcurrent and overpressure protection device ensures the safe transport of gas in the pipeline. The device requires no power supply during operation, has a simple structure, is not prone to failure, exhibits good stability, does not accidentally trip, and has low manufacturing costs.

[0076] In this embodiment, the rectifier combines rectification and cutoff functions into one. Specifically, its rectification function can be achieved by the downstream noise reduction block 51 and the current stabilizing tube bundle 52 located within the housing 1. Figures 7 to 10 As shown, the downstream noise reduction block 51 is fixedly installed in the downstream second cavity 14 and has a mesh structure. The flow stabilizing tube bundle 52 is located downstream of the downstream noise reduction block 51 and consists of several tubes filling the second cavity 14, with the tubes arranged along the length of the second cavity 14.

[0077] The downstream noise reduction block 51 with its mesh structure divides the airflow, initially rectifying it and making its velocity more uniform. Friction and collisions between the airflow and the mesh in the downstream noise reduction block 51 consume some kinetic energy, thus reducing the noise intensity of the airflow. Furthermore, the metal mesh structure in the downstream noise reduction block 51 rapidly absorbs heat from the flame during backfire, keeping the temperature of the combustion zone below the ignition point of the combustible gas. This prevents the flame from spreading further through the mesh and also provides some flame arrestor effect.

[0078] The airflow passing through the downstream noise reduction block 51 then enters the flow stabilization tube bundle 52 for further sorting. The airflow velocity on the outlet side will be more uniform and the direction will be consistent, which will facilitate accurate measurement by the subsequent ultrasonic flow meter.

[0079] In this embodiment, a cavity is provided between the downstream noise reduction block 51 and the flow stabilizing tube bundle 52, which can increase the flame-stopping distance and improve the flame-stopping effect. It is also beneficial for the downstream noise reduction block 51 and the flow stabilizing tube bundle 52 to cooperate in rectification. Compared with direct connection between the two, it has a better rectification effect.

[0080] In this embodiment, an upstream noise reduction block 53 is also fixedly disposed in the first cavity 13, and a noise reduction block filter 531 opposite to the air inlet 11 is provided in the middle of the upstream noise reduction block 53. Specifically, the noise reduction block filter 531 is fixedly connected to the inner wall of the first cavity 13 by a plurality of support rods 532 on its outer periphery. Figure 9 and Figure 10 As shown, one end of the support rod 532 is fixedly connected to the noise reduction block filter 531, and the other end is fixedly connected to the inner wall of the first cavity 13. Both the noise reduction block filter 531 and the support rod 532 are made of metal. When airflow enters the housing 1 from the front air inlet 11, the upstream noise reduction block 53 can divide the airflow, initially rectifying it and making the airflow velocity more uniform. The friction and collision between the airflow and the mesh consume some kinetic energy, thereby reducing the noise intensity of the airflow. The metal mesh rapidly absorbs the heat of the flame, making the temperature of the combustion zone lower than the ignition point of the combustible gas, preventing the flame from continuing to spread through the mesh, thus providing a certain flame-retardant function.

[0081] The rectifier in this embodiment mainly rectifies the chaotic airflow upstream, reduces noise generated by bending and narrowing of pipes, and incorporates pressure-sensitive elements (i.e., the first spring 22 and the seal 21). When the pressure at the front and rear ends is unbalanced, it can cut off the pipeline, prevent the gas from continuing to flow, avoid fire, and achieve safe gas delivery.

[0082] In this embodiment, a guide rod 23 is fixedly provided in the housing 1, and the seal 21 is slidably disposed on the guide rod 23. A first spring 22 is sleeved on the guide rod 23, which can ensure that the seal 21 slides smoothly in the housing 1. One end of the guide rod 23 is fixed to the upstream noise reduction block 53, which can achieve the fixation of the guide rod 23 by means of the existing necessary structure, without adding any structural components to the housing 1.

[0083] The sealing element 21 is a sphere mounted on the guide rod 23. In actual use, the sealing element 21 can only slide along the length of the guide rod 23 and will not move in other directions, ensuring stable sealing of the first hole 16 under set conditions. Furthermore, the spherical shape of the sealing element 21 facilitates gas flow within the pipeline and the rectifier, providing a certain degree of rectification and enabling successful sealing of the first hole 16 even with a large pressure difference between the upstream and downstream sides. The guide rod 23 and the sealing element 21 are centrally located in the middle of the housing 1, further increasing the gas flow velocity and the reaction speed for sealing the first hole 16 when the pressure difference between the upstream and downstream sides is large.

[0084] Under normal ventilation conditions, the airflow, after initial noise reduction and rectification by the front noise reduction block, enters the buffer zone on the left side of the seal 21. Here, turbulence and velocity gradients are eliminated, resulting in a more uniform airflow velocity distribution, pressure equalization, and attenuation of fluctuations. This alleviates the sudden pressure drop caused by the front noise reduction block and prevents negative pressure or pressure oscillations downstream. The large space and low flow velocity characteristics of the buffer zone extending to the right side of the seal 21 also slow down the flame propagation speed and reduce the risk of explosion. The seal 21 blocks the airflow within the buffer zone formed by the first cavity 13, creating multiple airflow vortices, further reducing the airflow velocity gradient, weakening turbulence intensity, and making the airflow relatively stable.

[0085] In some embodiments, the guide rod 23 can also be directly fixed to the inner wall of the housing 1, which can also guide the seal 21 to slide within the housing 1. Alternatively, the seal 21 can be directly slidably connected to the inner wall of the housing 1, ensuring that the seal 21 can seal the first hole 16 when sliding. For example, multiple grooves can be provided on the inner wall of the housing 1, and the side of the seal 21 can be slidably fitted into these grooves through a connector to achieve sliding within the housing 1.

[0086] In some embodiments, the sealing element 21 may also be a non-spherical object, such as a cylinder, round tube, ellipse, cuboid, etc., with a plane or arc surface opposite to the first hole 16 at one end, all of which can achieve the purpose of sealing the first hole 16.

[0087] In some embodiments, when the space of the second cavity 14 is large, the main body of the first spring 22 can also be disposed in the second cavity 14 and configured as a compression spring, i.e., a structure similar to that in Embodiment 1. One end of the first spring 22 is connected to the end of the seal 21 near the first hole 16, while the other end of the first spring 22 is fixed. When the seal 21 is pushed by the airflow, it compresses the first spring 22. The elastic force of the first spring 22 is equal to or substantially equal to the thrust of the seal 21 by the airflow, which can ensure that a certain distance is maintained between the seal 21 and the first hole 16, maintaining the flow of airflow. When the upstream air pressure exceeds the preset value of the downstream air pressure, the thrust of the airflow applied to the seal 21 increases significantly, which can press the seal 21 tightly against the first hole 16 to cut off the airflow.

[0088] In the above embodiments, the first cavity 13 is located near the upstream air supply end, so the sealing member 21 is disposed in the first cavity 13 to achieve the above-mentioned functions such as cutting off airflow. When the second cavity 14 is located near the upstream air supply end, the sealing member 21 can be disposed in the second cavity 14, and the above-mentioned functions such as cutting off airflow can also be achieved.

[0089] In this embodiment, another structural form of the pressure relief valve 3 is disclosed; please refer to [reference needed]. Figures 7 to 9The pressure relief valve 3 includes a lead screw 37 and a plug 38. The lead screw 37 is threaded to the side wall of the housing 1, and its outer end extends outside the housing 1, allowing the user to rotate it. The plug 38 is fixedly disposed on the inner end of the lead screw 37 and is opposite to the second hole 17.

[0090] When the lead screw 37 rotates and moves into the housing 1, the plug 38 seals the second hole 17, preventing the first chamber 13 and the second chamber 14 from communicating with the exhaust port 35 through the second hole 17. When the lead screw 37 rotates and moves out of the housing 1, the plug 38 releases the seal on the second hole 17, allowing the high-pressure gas in the first chamber 13 to enter the second chamber 14. Once the pressure in both chambers is equal or nearly equal, the seal 21 automatically opens under the force of the first spring 22, releasing the seal on the first hole 16. By setting the pressure relief valve 3, the dangerous situation of downstream end-users turning on gas before the overpressure condition is relieved is avoided.

[0091] The pressure relief valve 3, seal 21, guide rod 23 and other structures are made of stainless steel or other high-temperature resistant materials, which can reliably cut off the airflow while having good fire resistance and wear resistance, and there is no risk of air leakage, thus providing higher safety performance.

[0092] In this embodiment, the pressure relief valve 3 also includes a protective cap 36 sleeved on the outer end of the lead screw 37, which can protect the lead screw 37 and prevent external accidental contact with the lead screw 37, thus affecting the cutting-off function of the device.

[0093] The rectifier in this embodiment rectifies and reduces noise in the airflow, making ultrasonic metering downstream of the pipeline more accurate. Simultaneously, the built-in spherical seal 21 not only provides rectification and noise reduction but also automatically cuts off the airflow in case of overcurrent or overpressure. Integrating multiple functions into one structure allows for wide application in industrial gas pipelines, eliminating the need for pre-reserved 5D to 10D straight pipe sections, thus saving installation space. This multi-functional integration reduces costs, achieving noise reduction, rectification, and cutoff in a single device, ensuring accurate metering and safe gas delivery for the ultrasonic flow meter downstream of the pipeline.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pipe flow overpressure protection device, characterized in that, The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device.

4. A flame arrestor characterized by, The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. The application relates to a pipeline overcurrent protection device. 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7. A rectifier characterized by Comprise: The pipeline overcurrent protection device according to any one of claims 1 to 3; The downstream noise reduction block is fixedly arranged in the second cavity located downstream and is in a mesh structure; The steady flow pipe bundle is arranged downstream of the downstream noise reduction block and is a plurality of pipe bodies filled in the second cavity, and the pipe bodies are arranged along the length direction of the second cavity.

8. The rectifier of claim 7, wherein, Further comprise: The upstream noise reduction block is fixedly arranged in the first cavity located upstream and is provided with a noise reduction block filter screen at the middle part and opposite to the gas inlet.

9. The rectifier of claim 8, wherein, When the guide rod is arranged in the shell, one end of the guide rod is fixed on the upstream noise reduction block.

10. The rectifier of claim 8, wherein, The upstream noise reduction block further comprises a support rod, one end of the support rod is connected to the noise reduction block filter screen, and the other end of the support rod is connected to the inner wall of the first cavity.

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