Sectional blocking device for natural gas decompression pipeline

Abstract

The invention relates to the field of natural gas pipelines, in particular to a segmented blocking device for a natural gas decompression pipeline. According to an existing segmented blocking device, a maintainer cannot conveniently and rapidly position a faulted segment, the segment is not stable enough after being blocked, and the sealing effect between segments of all pipelines is not good enough. A natural gas decompression pipeline segmented blocking device comprises a pipeline and the like. The two ends of the pipeline are both fixedly connected with flanges, one sides of the two flanges are both fixedly connected with valve bodies, each valve body communicates with the interior of the pipeline, the middle of each valve body is rotationally connected with a valve element, and the upper portions of the two valve bodies are both fixedly connected with servo motors. The position of the piston push rod on the upper portion of the pipeline segment can be changed according to the change of the pressure intensity in the pipeline, then the scale indicated by the indicating rod is changed, and therefore an operator can determine the segment with the problem more quickly.

Description

Technical Field

[0001] The invention relates to the field of natural gas pipelines, and in particular to a segmented blocking device for a natural gas pressure-loss pipeline. Background Art

[0002] In order to ensure that natural gas is safely delivered to every household, a higher pressure is usually maintained in the natural gas pipeline. The higher pressure can ensure that the natural gas can be evenly distributed to each user. In the natural gas pipeline system, decompression means that the pressure in the pipeline is lower than the normal level or expected value. The possible reasons are pipeline damage and leakage, equipment failure, and increased demand, etc. After decompression occurs, the fault area needs to be isolated quickly and accurately to reduce the impact on the entire pipeline network.

[0003] However, the existing segmented blocking device is not convenient for maintenance personnel to quickly locate the faulty segment, and the segmented blocking device is not stable enough, and the sealing effect between the segments of each pipeline is not strong enough. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the present invention aims to provide a natural gas depressurized pipeline segment blocking device which is convenient for maintenance personnel to quickly locate the faulty pipeline segment and has more stable blocking and stronger sealing effect.

[0005] The technical solution is: a natural gas pressure-depleted pipeline segmented barrier device, including a pipeline, flanges are fixedly connected at both ends of the pipeline, valve bodies are fixedly connected to one side of the two flanges, each of the valve bodies is communicated with the interior of the pipeline, a valve core is rotatably connected to the middle of each valve body, a servo motor is fixedly connected to the upper part of the two valve bodies, the output shaft of the servo motor is connected to the valve core, a pressure sensor is provided on one side of the pipeline, the pressure sensor is used to control the opening and closing of the servo motor, an isolation mechanism is provided inside the pipeline, the isolation mechanism is used to isolate the interior of the pipeline in segments, and an indicating mechanism is provided on the pipeline, the indicating mechanism is used to indicate the pressure changes of each segment inside the pipeline.

[0006] Furthermore, the isolation mechanism includes two limit vertical rods, the two limit vertical rods are fixedly connected to the upper part of the pipe, a rack long rod is slidably connected between the two limit vertical rods, two support plates are fixedly connected to the upper part of the pipe, a rotating rod is rotatably connected to the middle part of each support plate, an isolation rotating plate is fixedly connected to the lower part of each rotating rod, the bottom and upper parts of the isolation rotating plate are in contact with the inner wall of the pipe, a sealing ring is fixedly connected to the side wall of each isolation rotating plate, and transmission gears are fixedly connected to the two rotating rods and the output shaft of one of the servo motors, and the three transmission gears are meshed with the rack long rod.

[0007] Furthermore, the indicating mechanism includes three straight cylinders, which are all fixedly connected to the upper part of the pipeline, each of the straight cylinders is communicated with the inside of the pipeline, each of the straight cylinders is slidably connected to a piston push rod, a supporting spring is connected between the piston push rod and the straight cylinder, each of the piston push rods is fixedly connected to an arc plate at the lower part, each of the piston push rods is fixedly connected to an indicating rod at the upper part, each of the straight cylinders is fixedly connected to a scale plate at the upper part, the indicating rod passes through the scale plate, and the indicating rod is aligned with the scale on the scale plate.

[0008] Furthermore, it also includes a locking mechanism, which is arranged on the pipe, and is used to lock the isolation rotating plate after rotation, and the locking mechanism includes two straight plates, both of which are fixedly connected to the pipe, and both of the straight plates are slidably connected with a card block, and the card block is provided with a groove, and a sliding rod is fixedly connected to the lower part of one side of the card block, and the sliding rod passes through the straight plate, and a return spring is connected between the straight plate and the sliding rod, and each of the rotating rods is fixedly connected to a rotating disk at the upper end, and the side of the rotating disk contacts the card block, and each of the rotating disks is provided with a notch, and each of the rotating disks is fixedly connected to a fixing frame, and each of the fixing frames is rotatably connected with a buckle plate, and one side of the buckle plate is provided with an inclined surface, and a torsion spring is connected between the buckle plate and the fixing frame.

[0009] Furthermore, a blocking mechanism is also included, which is arranged on the isolation rotating plate. The blocking mechanism is used to strengthen the blocking effect between the sections of the pipeline. The blocking mechanism includes two connecting tubes, and the two connecting tubes are respectively fixedly connected to the middle parts of the two isolation rotating plates. The connecting tubes are hollow in shape, and a balancing disk is slidably connected to each connecting tube. Both ends of each balancing disk are fixedly connected to a connecting frame, and a balancing spring is connected between the connecting frame and the connecting tube. Each connecting frame is fixedly connected to a bevel ring plate, and each bevel ring plate is covered with an elastic rubber strip, and the elastic rubber strip is in contact with the isolation rotating plate.

[0010] The present invention has the following advantages: 1. When one of the servo motors drives the valve core to rotate 90°, it will drive one of the transmission gears to rotate, and then drive the other transmission gears to rotate 90° through the long rack rod, and then drive the two rotating rods and the isolation rotating plate to rotate 90° together. The two isolation rotating plates rotate 90° to isolate the inside of the pipeline in sections, and the sealing ring on each isolation rotating plate can ensure that the isolation rotating plate can better isolate the inside of the pipeline. After the isolation rotating plate isolates the inside of the pipeline in sections, subsequent operators can identify the air leakage of each section of the pipeline, and when a pressure drop occurs in one of the sections of the pipeline, the difference between the pressure in the pipeline and a standard atmospheric pressure becomes smaller, which will cause the piston push rod on the upper part of the pipeline section to move downward a distance, and then the scale indicated by the indicator rod will change, so that the operator can quickly determine the problematic section.

[0011] 2. When the transmission gear drives the rotating rod to rotate 90°, it will drive the turntable to rotate 90°, and then the rotation of the turntable will drive the buckle plate to rotate together. After the turntable rotates 90°, the notch will align with the block, and then the reset spring drives the block to move horizontally, so that the block is stuck in the notch on the turntable, and then when the block moves horizontally, it will first squeeze the buckle plate to swing upward, the torsion spring is twisted, and then one side of the buckle plate is aligned with the groove on the block, so that the buckle plate swings downward and is stuck in the groove on the block. The block is stuck in the notch on the turntable, so that the turntable and the isolation turntable will no longer rotate, and the buckle plate is stuck in the groove on the block, so that the block will not fall out of the notch on the turntable, so that the inside of the pipeline can be more stable after being blocked in sections.

[0012] 3. When the pipeline loses pressure and the isolation rotating plate rotates 90° to block the inside of the pipeline in sections, the isolation rotating plate will rotate to the side perpendicular to the gas transmission direction of the pipeline. Then, when one of the sections after the pipeline section blocking leaks and loses pressure, the pressure in the depressurized section will be the same as the outside, so that the pressure difference between the pressure in the depressurized section and the adjacent normal section is large. When the pressures in the two sections of the pipeline on both sides of the isolation rotating plate between the normal section and the depressurized section are different, due to the large pressure difference, the balance plate will move horizontally to one side of the depressurized section. The horizontal movement of the balance plate will drive the inclined ring plate to move horizontally together. The horizontal movement of the inclined ring plate close to the side of the non-depressurized pipeline section will squeeze the elastic rubber strip, so that the radius of the elastic rubber strip is expanded, so that the elastic rubber strip is close to the inner wall of the pipeline and the contact place with the isolation rotating plate, thus strengthening the sealing effect of the isolation rotating plate, making it difficult for the gas in the non-depressurized section to flow into the depressurized section due to the large pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the pipeline and the valve body of the present invention.

[0015] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the pipeline and the straight cylinder of the present invention.

[0016] Figure 4 It is a three-dimensional structural schematic diagram of the isolation rotating plate and the blocking mechanism of the present invention.

[0017] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the isolation rotating plate of the present invention.

[0018] Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the connecting pipe of the present invention.

[0019] Figure 7 It is a schematic diagram of the separation three-dimensional structure of the isolation rotating plate, the inclined ring plate and the elastic rubber strip of the present invention.

[0020] Figure 8 It is a three-dimensional structural schematic diagram of the locking mechanism of the present invention.

[0021] Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged three-dimensional structure at point A in the middle.

[0022] Fig.10 It is a schematic diagram of the separated three-dimensional structure of the turntable, the fixing frame and the buckle plate of the present invention.

[0023] The meanings of the reference numerals in the figure are as follows: 1: pipeline, 2: flange, 31: valve body, 32: valve core, 33: servo motor, 34: pressure sensor, 41: limit vertical rod, 42: rack long rod, 43: support plate, 44: rotating rod, 45: isolation rotating plate, 451: sealing ring, 46: transmission gear, 51: straight cylinder, 52: piston push rod, 53: support spring, 54: arc panel, 55: indicator rod, 56: scale plate, 61: straight plate, 62: block, 63: sliding rod, 64: reset spring, 65: turntable, 66: fixing frame, 67: buckle plate, 68: torsion spring, 71: connecting pipe, 72: balancing plate, 73: connecting frame, 74: balancing spring, 75: bevel ring plate, 76: elastic rubber strip. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] A natural gas pressure-loss pipeline segmented blocking device, such as Figure 1-10 As shown, it includes a pipeline 1, both ends of the pipeline 1 are fixedly connected with flanges 2, one side of the two flanges 2 is fixedly connected with a valve body 31, each of the valve bodies 31 is communicated with the inside of the pipeline 1, the middle part of each valve body 31 is rotatably connected with a valve core 32, the upper parts of the two valve bodies 31 are fixedly connected with a servo motor 33, the output shaft of the servo motor 33 is connected to the valve core 32, a pressure sensor 34 is provided on one side of the pipeline 1, the pressure sensor 34 is used to control the opening and closing of the servo motor 33 close to the side of the pressure sensor 34, an isolation mechanism is provided inside the pipeline 1, the isolation mechanism is used to isolate the inside of the pipeline 1 in sections, and an indication mechanism is provided on the pipeline 1, the indication mechanism is used to indicate the pressure changes of each section inside the pipeline 1.

[0027] The isolation mechanism includes two limit vertical rods 41, and the two limit vertical rods 41 are fixedly connected to the upper part of the pipeline 1. A rack long rod 42 is slidably connected between the two limit vertical rods 41. Two support plates 43 are fixedly connected to the upper part of the pipeline 1. The middle part of each support plate 43 is rotatably connected to a rotating rod 44, and the lower part of each rotating rod 44 is fixedly connected to an isolation rotating plate 45. The bottom and upper part of the isolation rotating plate 45 are in contact with the inner wall of the pipeline 1, and a sealing ring 451 is fixedly connected to the side wall of each isolation rotating plate 45. Transmission gears 46 are fixedly connected to the two rotating rods 44 and the output shaft of one of the servo motors 33, and the three transmission gears 46 are meshed with the rack long rod 42.

[0028] The indicating mechanism includes three straight cylinders 51, which are fixedly connected to the upper part of the pipeline 1, each of the straight cylinders 51 is communicated with the inside of the pipeline 1, each of the straight cylinders 51 is slidably connected to a piston push rod 52, a support spring 53 is connected between the piston push rod 52 and the straight cylinder 51, a curved plate 54 is fixedly connected to the lower part of each piston push rod 52, an indicating rod 55 is fixedly connected to the upper part of each piston push rod 52, and a scale plate 56 is fixedly connected to the upper part of each straight cylinder 51, the indicating rod 55 passes through the scale plate 56, and the indicating rod 55 is aligned with the scale on the scale plate 56.

[0029] In actual gas transmission work, in order to achieve gas transmission and improve gas transmission efficiency, the pressure in the natural gas pipeline 1 usually needs to be greater than the atmospheric pressure outside the pipeline. When the pressure in the pipeline 1 drops due to unknown reasons, the pipeline 1 will experience a pressure loss phenomenon. Initially, when the pressure in the pipeline 1 is at a normal value, the gas in the pipeline 1 flows from the side away from the pressure sensor 34 to the side close to the pressure sensor 34, the valve core 32 is in a conducting state, and the piston push rod 52 is in an initial position and cannot move upward. The indicator rod 55 will indicate the initial scale of the scale plate 56. Then, when the pipeline 1 loses pressure, the pressure sensor 34 in the pipeline 1 will detect that the pressure in the pipeline 1 becomes smaller, thereby controlling the servo motor 33 to drive the valve core 32 close to the pressure sensor 34 to rotate 90°, so that the valve core 32 is in a closed state, and then one end of the pipeline 1 is closed, and then the gas is continuously introduced into the pipeline 1, so that the pressure in the pipeline 1 is in a higher state, and the pressure difference between the pipeline 1 and the outside is large, and then the operator starts again. The servo motor 33 moves away from the side of the pressure sensor 34, and when it drives the valve core 32 to rotate 90°, it will drive one of the transmission gears 46 to rotate, and then drive the other transmission gears 46 to rotate 90° through the rack long rod 42, and then drive the two rotating rods 44 and the isolation rotating plate 45 to rotate 90° together. The rotation of the two isolation rotating plates 45 by 90° will isolate the inside of the pipeline 1 in sections, wherein the sealing ring 451 on each isolation rotating plate 45 can ensure that the isolation rotating plate 45 can better isolate the inside of the pipeline 1. After the isolation rotating plate 45 isolates the inside of the pipeline 1 in sections, subsequent operators can identify the leakage of each section of the pipeline 1, and when one of the sections in the pipeline 1 has a pressure drop phenomenon, due to the smaller difference between the pressure in the pipeline 1 and the atmospheric pressure outside the pipeline, the piston push rod 52 on the upper part of the section will move downward for a distance, thereby causing the scale indicated by the indicator rod 55 to change, so that it no longer indicates the initial scale, so that the operator can quickly determine the problematic section.

[0030] Example 2

[0031] On the basis of Example 1, Figure 8-10As shown, a locking mechanism is also included, which is arranged on the pipeline 1 and is used to lock the isolation rotating plate 45 after rotation. The locking mechanism includes two straight plates 61, and the two straight plates 61 are fixedly connected to the pipeline 1. A block 62 is slidably connected to the two straight plates 61, and a groove is provided on the block 62. A sliding rod 63 is fixedly connected to the lower part of one side of the block 62, and the sliding rod 63 passes through the straight plate 61. A reset spring 64 is connected between the straight plate 61 and the sliding rod 63. A rotating disk 65 is fixedly connected to the upper end of each rotating rod 44, and the side of the rotating disk 65 contacts the block 62. A notch is provided on each rotating disk 65, and a fixing frame 66 is fixedly connected to each rotating disk 65. A buckle plate 67 is rotatably connected to each fixing frame 66. A slope is provided on one side of the buckle plate 67, and a torsion spring 68 is connected between the buckle plate 67 and the fixing frame 66.

[0032] At first, the reset spring 64 is in a stretched state. When the transmission gear 46 drives the rotating rod 44 to rotate 90° together, it will drive the rotating disk 65 to rotate 90° together. Then, the rotation of the rotating disk 65 will drive the buckle plate 67 to rotate together. After the rotating disk 65 rotates 90°, the notch will be aligned with the block 62. Then the reset spring 64 drives the block 62 to move horizontally, so that the block 62 is stuck in the notch on the rotating disk 65. Then, when the block 62 moves horizontally, it will first squeeze the buckle plate 67 to swing upward. The torsion spring 68 is twisted, and then one side of the buckle plate 67 is aligned with the groove on the block 62, so that the buckle plate 67 swings downward and is stuck in the groove on the block 62. The block 62 is stuck in the notch on the rotating disk 65, so that the rotating disk 65 and the isolation rotating plate 45 will not rotate again. The buckle plate 67 is stuck in the groove on the block 62, so that the block 62 will not be separated from the notch on the rotating disk 65. This can make the interior of the pipeline 1 more stable after being blocked in sections.

[0033] Example 3

[0034] On the basis of Example 2, Figure 4-7 As shown, a blocking mechanism is also included, which is arranged on the isolation rotating plate 45. The blocking mechanism is used to strengthen the blocking effect between the sections of the pipeline 1. The blocking mechanism includes two connecting pipes 71, and the two connecting pipes 71 are respectively fixedly connected to the middle parts of the two isolation rotating plates 45. The connecting pipes 71 are hollow in shape, and each of the connecting pipes 71 is slidably connected with a balancing disk 72. Both ends of each balancing disk 72 are fixedly connected with a connecting frame 73, and a balancing spring 74 is connected between the connecting frame 73 and the connecting pipe 71. Each of the connecting frames 73 is fixedly connected with a bevel ring plate 75, and each of the bevel ring plates 75 is covered with an elastic rubber strip 76, and the elastic rubber strip 76 is in contact with the isolation rotating plate 45.

[0035] When the pipeline 1 loses pressure and the isolation rotating plate 45 rotates 90 degrees to block the inside of the pipeline 1 in sections, the isolation rotating plate 45 will rotate to the side perpendicular to the gas transmission direction of the pipeline 1. Then, when one of the sections of the pipeline 1 loses pressure due to leakage, the pressure in the depressurized section will be the same as the outside, making the pressure difference between the pressure in the depressurized section and the pressure in the adjacent normal section larger. When the pressures in the two sections of the pipeline 1 on both sides of the isolation rotating plate 45 between the normal section and the depressurized section are different, due to the large pressure difference, The balancing plate 72 will move horizontally toward the side of the pressure-loss segment. The horizontal movement of the balancing plate 72 will drive the beveled ring plate 75 to move horizontally together. The horizontal movement of the beveled ring plate 75 close to the side of the non-pressure-loss pipeline 1 segment will squeeze the elastic rubber strip 76, so that the radius of the elastic rubber strip 76 is expanded, so that the elastic rubber strip 76 is closely attached to the contact point between the inner wall of the pipeline 1 and the isolation rotating plate 45, thereby enhancing the sealing effect of the isolation rotating plate 45, so that the gas in the non-pressure-loss segment is not easy to flow into the pressure-loss segment due to the large pressure difference.

[0036] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A natural gas pressure-loss pipeline segmented blocking device, characterized in that: The invention comprises a pipeline (1), both ends of the pipeline (1) are fixedly connected with flanges (2), one side of the two flanges (2) is fixedly connected with a valve body (31), each valve body (31) is communicated with the interior of the pipeline (1), the middle part of each valve body (31) is rotatably connected with a valve core (32), the upper parts of the two valve bodies (31) are fixedly connected with a servo motor (33), the output shaft of the servo motor (33) is connected with the valve core (32), one side of the pipeline (1) is provided with a pressure sensor (34), the pressure sensor (34) is used to control the opening and closing of the servo motor (33), the interior of the pipeline (1) is provided with an isolation mechanism, the isolation mechanism is used to isolate the interior of the pipeline (1) in sections, and the pipeline (1) is provided with an indication mechanism, the indication mechanism is used to indicate the pressure change of each section in the pipeline (1).

2. A natural gas pressure-depleted pipeline segmented blocking device according to claim 1, characterized in that: The isolation mechanism comprises two limit vertical rods (41), the two limit vertical rods (41) are fixedly connected to the upper part of the pipeline (1), a rack long rod (42) is slidably connected between the two limit vertical rods (41), two support plates (43) are fixedly connected to the upper part of the pipeline (1), the middle part of each support plate (43) is rotatably connected to a rotating rod (44), the lower part of each rotating rod (44) is fixedly connected to an isolation rotating plate (45), the bottom and the upper part of the isolation rotating plate (45) are in contact with the inner wall of the pipeline (1), and a sealing ring (451) is fixedly connected to the side wall of each isolation rotating plate (45), and a transmission gear (46) is fixedly connected to the two rotating rods (44) and the output shaft of one of the servo motors (33), and the three transmission gears (46) are meshed with the rack long rod (42).

3. A natural gas pressure-loss pipeline segmented blocking device according to claim 2, characterized in that: The indicating mechanism comprises three straight cylinders (51), the three straight cylinders (51) are fixedly connected to the upper part of the pipeline (1), each of the straight cylinders (51) is communicated with the interior of the pipeline (1), each of the straight cylinders (51) is slidably connected to a piston push rod (52), a support spring (53) is connected between the piston push rod (52) and the straight cylinder (51), the lower part of each piston push rod (52) is fixedly connected to an arc plate (54), the upper part of each piston push rod (52) is fixedly connected to an indicating rod (55), the upper part of each straight cylinder (51) is fixedly connected to a scale plate (56), the indicating rod (55) passes through the scale plate (56), and the indicating rod (55) is aligned with the scale on the scale plate (56).

4. A natural gas pressure-loss pipeline segmented blocking device according to claim 3, characterized in that: The invention also comprises a locking mechanism, which is arranged on the pipeline (1) and is used to lock the isolation rotating plate (45) after rotation. The locking mechanism comprises two straight plates (61), which are fixedly connected to the pipeline (1), and are slidably connected to a clamping block (62), which is provided with a groove, and a sliding rod (63) is fixedly connected to the lower part of one side of the clamping block (62), which passes through the straight plate (61), and the straight plate (61) is provided with a plurality of clamping blocks (62). ) and the sliding rod (63) are connected with a reset spring (64), the upper end of each rotating rod (44) is fixedly connected with a rotating disk (65), the side of the rotating disk (65) is in contact with the blocking block (62), each rotating disk (65) is provided with a notch, each rotating disk (65) is fixedly connected with a fixing frame (66), each fixing frame (66) is rotatably connected with a buckle plate (67), one side of the buckle plate (67) is provided with an inclined surface, and a torsion spring (68) is connected between the buckle plate (67) and the fixing frame (66).

5. A natural gas pressure-depleted pipeline segmented blocking device according to claim 4, characterized in that: The utility model also comprises a blocking mechanism, which is arranged on the isolation rotating plate (45) and is used to strengthen the blocking effect between the sections of the pipeline (1). The blocking mechanism comprises two connecting pipes (71), which are respectively fixedly connected to the middle parts of the two isolation rotating plates (45). The connecting pipes (71) are hollow in shape, and a balancing plate (72) is slidably connected in each connecting pipe (71). Both ends of each balancing plate (72) are fixedly connected to a connecting frame (73), and a balancing spring (74) is connected between the connecting frame (73) and the connecting pipe (71). Each connecting frame (73) is fixedly connected to a bevel ring plate (75), and each bevel ring plate (75) is sleeved with an elastic rubber strip (76), and the elastic rubber strip (76) is in contact with the isolation rotating plate (45).

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