A natural gas transmission station delivery filter device

Abstract

The utility model relates to natural gas conveying equipment technical field, concretely relates to a kind of natural gas transmission station conveying filtering device, including pipeline, and the both ends of pipeline are perforated and are provided with conveying cavity, for the circulation of natural gas, the top of pipeline is perforated and is provided with the penetration cavity that is tangent with conveying cavity vertically, the top of pipeline and bottom are rotatably detachably installed with take-up roller, the outer peripheral wall of two take-up rollers is collectively equipped with the filter screen that is adapted to pass through penetration cavity, so that filter screen forms a filtering barrier inside pipeline, the top of pipeline is provided with servo motor, the output end of servo motor is detachably connected with the take-up roller one end located at the top of pipeline by speed reducer, for driving its rotation, the utility model is monitored in real time by flow rate sensor, and servo motor is intelligently judged and controlled by PLC controller and moves, realizes the automatic on-line replacement of filter screen, completely avoids the problem that gas transmission operation is stopped due to filter screen replacement, guarantees the continuity of natural gas transmission.

Description

Technical Field

[0001] This utility model relates to the field of natural gas transmission equipment technology, specifically to a natural gas transmission station transmission and filtration device. Background Technology

[0002] During the natural gas transportation process, filters are usually installed in the pipelines of the gas transmission station to remove particulate impurities, droplets, and other contaminants contained in the natural gas, in order to protect downstream metering equipment, pressure regulating equipment, compressors and other precision instruments, and to ensure the safe and stable operation of the gas transmission system.

[0003] Currently, most common pipeline filters are fixed structures such as basket or Y-type filters. When the filter screen becomes clogged and the pressure drop increases, the upstream and downstream valves must be closed and the gas supply stopped before the filter can be opened for cleaning or replacement. This operation is not only cumbersome and time-consuming, but more importantly, it can interrupt the gas supply, affecting the continuous and stable supply of the entire pipeline network and causing economic losses. Therefore, there is an urgent need for a new type of filtration device that can automatically replace the filter screen online without interrupting gas supply. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a natural gas transmission station conveying filtration device that can monitor the filter screen blockage in real time and automatically and online replace the filter screen without interrupting the natural gas transmission, thus effectively improving operating efficiency and gas supply reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A natural gas transmission station conveying and filtering device includes a pipeline with conveying chambers extending through both ends for the flow of natural gas. A through-cavity perpendicular to and tangential to the conveying chambers is formed at the top and bottom of the pipeline. It also includes: The top and bottom of the pipe are detachably and rotatably mounted with take-up and release rollers. The outer peripheral walls of the two take-up and release rollers are fitted with a filter screen that is compatible with the through cavity, so that the filter screen forms a filter barrier inside the pipe. A servo motor is installed above the pipe. The output end of the servo motor is detachably connected to one end of the take-up and release roller located at the top of the pipe through a reducer, and is used to drive the roller to rotate. A flow rate sensor is installed inside the pipeline on the leeward side of the filter screen to monitor the flow rate of the filtered natural gas. A PLC controller is fixedly installed at the top of the pipe, and the PLC controller is connected to the servo motor and the flow rate sensor.

[0006] The PLC controller is configured to: receive monitoring data from the flow rate sensor; when the data indicates that the flow rate is lower than a preset threshold, determine that the filter screen is severely clogged; then send a command to the servo motor to start it and rotate a certain number of times to wind up the filter screen located above the pipe, while releasing a new filter screen from the take-up and unwinding rollers below the pipe, thereby sending a clean filter screen segment into the conveying chamber of the pipe to replace the clogged filter screen segment.

[0007] Furthermore, square flanges are fixedly installed at both ends of the pipe for connection to external pipes. Sealing strips are installed at both the upper and lower openings of the through-cavity to maintain the airtightness of the pipe delivery cavity while the filter screen passes through, preventing natural gas leakage.

[0008] Furthermore, the length of the through cavity is greater than its width and less than the width of the pipe, to ensure that the filter screen can effectively cover the entire pipe cross-section.

[0009] Furthermore, two parallel fixed seats are vertically fixedly installed at the top and bottom of the pipe, and the two take-up and release rollers are respectively rotatably installed between the corresponding two sets of fixed seats through bearings.

[0010] Furthermore, a square rod penetrating the take-up and untake-up rollers is provided between each of the two parallel fixed seats, with one end of the square rod inserted into the output shaft of the servo motor. The effective transmission of power is achieved through the cooperation between the square rod and the square hole inside the take-up and untake-up rollers.

[0011] Furthermore, screws are installed at both the top and bottom of the pipe. Two screws are threaded through the corresponding fixing bases and slidably inserted into one end of the corresponding square rod. By unscrewing the screws, the square rod, along with the take-up and untake-down rollers and the filter screen, can be removed from the fixing base as a whole, facilitating the replacement of the depleted or maintenance-required filter screen roll.

[0012] The beneficial effects of this utility model are: Online automatic replacement, continuous operation: Through real-time monitoring by flow rate sensors, the PLC controller intelligently judges and controls the servo motor to achieve automatic online replacement of the filter screen, completely avoiding the problem of stopping gas transmission due to filter screen replacement and ensuring the continuity of natural gas transmission.

[0013] Easy maintenance and quick replacement: The design of fixing the square rod with screws allows the entire filter screen and take-up roller assembly to be quickly disassembled and installed as a whole, which greatly simplifies the maintenance and replacement process and reduces the labor intensity and working time of operators.

[0014] Reasonable structure and reliable sealing: The square flange is easy to install, and the sealing strip at the through cavity effectively solves the problem of dynamic sealing. It allows the filter screen to move while ensuring the sealing of the pipeline system, preventing high-pressure natural gas leakage, and ensuring safety and reliability.

[0015] Stable drive and precise positioning: The servo motor, combined with a square rod drive, ensures stable drive, high torque, and precise control of the rotation angle of the take-up and undo rollers. This allows for accurate control of the winding and undo length of the filter screen, ensuring proper switching between old and new filter screens. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the through-cavity distribution structure of this utility model; Figure 3 This is a schematic diagram of the filter screen installation structure of this utility model; Figure 4 This is a schematic diagram of the detachable installation structure of the take-up and release rollers of this utility model.

[0018] The labels in the diagram represent: 1. Pipe; 11. Square flange; 12. Through cavity; 13. Sealing strip; 21. Mounting base; 22. Take-up and untake-down rollers; 23. Square rod; 24. Screw; 25. Servo motor; 26. Filter screen; 3. PLC controller; 31. Flow rate sensor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] The present invention will be further described below with reference to the embodiments.

[0021] Example 1 Reference Figure 1-4 This first embodiment of the present invention discloses a natural gas transmission station conveying and filtering device, including a pipeline 1 with conveying chambers extending through both ends of the pipeline 1. A through-hole 12, perpendicular and tangential to the conveying chambers, is formed at the top and bottom of the pipeline 1. The device also includes detachable and rotatably mounted take-up and release rollers 22 at both the top and bottom of the pipeline 1. A filter screen 26, adapted to pass through the through-hole 12, is fitted onto the outer periphery of both take-up and release rollers 22. The filter screen 26 is a multi-layer stainless steel wire woven composite structure, with a surface layer of 50μm fine filtration, a middle layer of high-strength support mesh, and a bottom layer of coarse-pore reinforced base fabric. The overall thickness is 2.5mm, exhibiting excellent flexibility and tensile strength, and capable of withstanding a working pressure difference of 0.8MPa. A servo motor 25 is installed above the pipeline 1. The servo motor 25 is an AC servo motor with an absolute encoder, rated torque of 15N·m, and, in conjunction with a precision reducer, a reduction ratio of 1:15, achieving a positioning accuracy of ±0.1°. The output end of the servo motor 25 is detachably connected to one end of the take-up and untake-down roller 22 via a reducer. A flow velocity sensor 31 is installed on the leeward side of the filter screen 26 inside the pipe 1. The flow velocity sensor 31 is a thermal mass flow meter with a measurement range of 0-30 m / s, an accuracy of ±1%FS, and a pressure rating of PN40. A PLC controller 3 is fixedly installed at the top of the pipe 1, which is connected to the servo motor 25 and the flow velocity sensor 31. The PLC controller 3 has a built-in PID control algorithm and collects the 4-20mA analog signal from the flow velocity sensor in real time at a sampling frequency of 100Hz. When the detected flow velocity value is lower than 80% of the set threshold for 10 seconds, the controller automatically generates a screen replacement command.

[0022] Example 2 Reference Figure 1-4 This is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: square flanges 11 are fixedly installed at both ends of the pipe 1. The flange sealing surface adopts an RJ-type ring connection surface with two O-ring sealing grooves, capable of withstanding a design pressure of 10MPa. Sealing strips 13 are installed at both the upper and lower openings of the through cavity 12. The sealing strips 13 are filled with polytetrafluoroethylene material and internally wrapped with stainless steel springs, forming a self-tightening sealing structure that maintains a leakage rate of ≤10ppm when the filter screen 26 moves. The cavity length of the through cavity 12 is greater than the cavity width of the conveying cavity and less than the width of the pipe 1, ensuring that the effective filtration area of ​​the filter screen 26 is more than 95% of the pipe cross-sectional area.

[0023] Two parallel fixed seats 21 are vertically fixed at the top and bottom of pipe 1. The fixed seats 21 are made of QT400 ductile iron and internally fitted with double-row tapered roller bearings with a rated load of 5000N. Two take-up and untake-up rollers 22 are respectively positioned between the corresponding fixed seats 21. The surface of the take-up and untake-up rollers 22 is coated with a tungsten carbide wear-resistant coating. The roller diameter is 150mm, and the effective winding length is 50m. Both ends of the take-up and untake-up rollers 22 have spiral guide grooves with a groove spacing of 50mm to ensure uniform winding of the filter screen 26 during take-up and untake-up, preventing deviation. A square rod 23, made of 42CrMo alloy steel and surface-hardened to a hardness of HRC45-50, is installed between each of the two parallel fixed seats 21. One end of the square rod 23 is inserted into the output shaft of the servo motor 25, with an H7 / g6 tolerance fit to ensure transmission accuracy. Screws 24 are installed above and below the pipe 1. The two screws 24 are threaded through the corresponding fixing seat 21 and slidably inserted into one end of the corresponding square rod 23. The screws 24 are based on traditional threaded nails with the addition of a round shaft end. The round shaft end is made of GCr15 bearing steel and the surface is polished to Ra0.4. Therefore, during the actual take-up and take-up of the take-up and take-up roller 22, only the square rod 23 and the output shaft of the servo motor 25 rotate, while the round shaft remains stationary and rotates relative to the square rod 23, thus supporting the square rod 23 and the entire take-up and take-up roller 22.

[0024] The PLC controller 3 is equipped with an industrial Ethernet interface, supporting the Modbus TCP protocol, enabling remote monitoring and parameter setting. The system also features an emergency manual operation mode, allowing manual filter replacement via a hand crank in case of power failure. A flow-rectifying grille with a 20mm aperture and 30mm thickness is installed on the inner wall of pipe 1 200mm from the windward side of filter 26, ensuring even airflow through the filter 26 and preventing localized erosion damage. The reducer employs a planetary gear reduction structure with a transmission efficiency ≥95%, noise ≤75dB, and a service life of 20,000 hours. The sealing strip 13 features a modular design and quick-installation structure, allowing for individual replacement of sealing elements without shutting down the system. The connection end between the square rod 23 and the take-up / untake-off roller 22 has a positioning pin hole, using an 8mm conical pin for positioning to ensure transmission synchronization accuracy. The bottom of the fixed base 21 has an oil collection groove and an oil level observation window, allowing for grease replenishment via an oil gun.

[0025] The remaining structure is the same as that in Example 1.

[0026] The work process is as follows: S1. Normal filtration process Natural gas flows into the delivery chamber at one end of pipeline 1 and passes through filter screen 26. Filter screen 26 intercepts and filters solid particulate impurities and droplets in the natural gas, while clean natural gas passes through filter screen 26 and flows out from the delivery chamber at the other end of pipeline 1.

[0027] S2. Real-time monitoring process During this process, the flow velocity sensor 31, which is fixedly installed on the leeward side of the filter screen 26 inside the pipeline 1, continuously monitors the flow velocity of the natural gas flowing through this section in real time and transmits the collected flow velocity data signal to the PLC controller 3.

[0028] S3. Data Judgment Process The PLC controller 3 has a preset flow rate threshold range set according to the normal operating conditions of the system. When the filter screen 26 gradually becomes clogged due to the interception of impurities, its flow area decreases, resulting in a corresponding decrease in the flow rate of natural gas after passing through the filter screen 26.

[0029] The PLC controller 3 continuously receives and processes data from the flow rate sensor 31. When the monitored flow rate value remains below the set minimum alarm threshold, the PLC controller 3 determines that the filter 26 is severely clogged and needs to be replaced.

[0030] S4. Automatic Trigger Replacement Process Therefore, the PLC controller 3 sends a start command to the servo motor 25. The servo motor 25 starts precisely according to the preset program, and transmits torque to the top take-up and untake-up roller 22 through the reducer and the square rod 23 that is detachably connected to it, driving it to rotate.

[0031] S5. Filter Replacement Process The top take-up roller 22 rotates and begins to wind up a section of the clogged old filter screen 26. At the same time, since the upper and lower take-up rollers 22 are fitted with the same filter screen 26, the bottom take-up roller 22 is passively rotated under the tension of the filter screen 26, simultaneously releasing a section of clean, unused filter screen 26 of equal length.

[0032] After the old and new filter screens 26 are switched, the clean filter screen 26 section is reinserted into the through cavity 12 and conveying cavity of pipe 1 to restore its filtration function. The previously clogged screen section is then rolled away from the working area.

[0033] S6. System Reset Process After the filter 26 is replaced, the airflow resistance decreases, and the data monitored by the flow rate sensor 31 returns to normal. The PLC controller 3 then controls the servo motor 25 to stop working, and the system enters a new round of continuous monitoring cycle.

[0034] S7. Overall Replacement and Maintenance Process When the entire roll of filter screen 26 is about to run out or needs to be replaced, the operator can unscrew the screws 24 that thread through the mounting base 21 and are inserted into one end of the square rod 23. After unscrewing all the screws 24, the square rod 23, along with the take-up and unload rollers 22 and the filter screen 26 wound on them, can be removed from the mounting base 21 as a whole. Subsequently, a take-up and unload roller assembly pre-wound with a brand new filter screen 26 can be installed back into the mounting bases 21, inserted into the square rod 23, and the screws 24 tightened to secure it, thus quickly completing the maintenance and replacement.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A natural gas transmission station conveying and filtering device, comprising a pipeline (1), wherein conveying chambers are provided through both ends of the pipeline (1), and a through cavity (12) perpendicular to and tangential to the conveying chambers is provided through the top and bottom of the pipeline (1), characterized in that, Also includes: The top and bottom of the pipe (1) are detachably and rotatably mounted with take-up rollers (22). The outer peripheral walls of the two take-up rollers (22) are fitted with a filter screen (26) that is compatible with the through cavity (12). A servo motor (25) is provided above the pipe (1). The output end of the servo motor (25) is detachably connected to one end of the take-up roller (22) through a reducer. A flow rate sensor (31) is provided on the leeward side of the filter screen (26) inside the pipe (1). A PLC controller (3) that is signal-connected to the servo motor (25) and the flow rate sensor (31) is fixedly installed at the top of the pipe (1).

2. The natural gas transmission station conveying and filtering device according to claim 1, characterized in that, Square flanges (11) are fixedly installed at both ends of the pipe (1), and sealing strips (13) are installed at the upper and lower openings of the through cavity (12).

3. A natural gas transmission station conveying and filtering device according to claim 1, characterized in that, The length of the through cavity (12) is greater than the length of the conveying cavity and less than the width of the pipe (1).

4. A natural gas transmission station conveying and filtering device according to claim 1, characterized in that, The top and bottom of the pipe (1) are each vertically fixed with two parallel fixed seats (21), and the two take-up and release rollers (22) are respectively set between the corresponding fixed seats (21).

5. A natural gas transmission station conveying and filtering device according to claim 4, characterized in that, A square rod (23) is provided between the two parallel fixed seats (21) and passes through the take-up and release rollers (22). One end of the square rod (23) is inserted into the output shaft of the servo motor (25).

6. A natural gas transmission station conveying and filtering device according to claim 5, characterized in that, Screws (24) are provided above and below the pipe (1). The two screws (24) are threaded through the corresponding fixing seat (21) and slidably inserted into one end of the corresponding square rod (23).

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