Pipeline air pressure detection device

Abstract

The utility model discloses a pipeline air pressure detection device, which relates to the technical field of air pressure detection, and comprises a left shell and a right shell which are opposite to each other, two side ports of each shell are respectively provided with a large port and a small port, the left end and the right end of each shell are respectively provided with a flange plate, the shells are connected through the flange plates, and supporting rods are arranged on the inner side wall of the left shell in a central symmetry manner. A center cylinder is arranged between the supporting rods, a sealing cover is arranged at the right end of the center cylinder, a limiting cylinder is arranged in the middle of the sealing cover, a piston rod is movably connected to the inner side of the limiting cylinder, a plug matched with the shell is arranged at the right end of the piston rod, and a piston head matched with the center cylinder is arranged at the left end of the piston rod. After the pipeline leaks, the plug blocks the outlet of the shell through the force of the air pressure difference, flowing of the pipeline is prevented, further leakage is avoided, extra resources such as electric power are not needed in the using process, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air pressure detection, in particular to a pipeline air pressure detection device. Background Art

[0002] In the prior art, pipelines are usually used to transport gas substances such as natural gas over long distances, so as to transport the gas from the supply end to the use end. Due to natural wear and other reasons, there may be leakage points in the pipeline. The positions of the leakage points are not easy to detect, resulting in resource losses and potential safety hazards. Content of the Utility Model

[0003] The purpose of the utility model is to provide a pipeline air pressure detection device to solve the problems put forward in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A pipeline air pressure detection device includes a left and right opposite housing. The two side ports of the housing are of different sizes. Flange plates are provided at both the left and right ends of the housing. The housings are connected through the flange plates. Support rods are symmetrically arranged at the center of the inner side wall of the left housing. A central cylinder is arranged between the support rods. A cover is provided at the right end of the central cylinder. A limiting cylinder is arranged in the middle of the cover. A piston rod is movably connected inside the limiting cylinder. A plug that fits with the housing is provided at the right end of the piston rod. A piston head that fits with the central cylinder is provided at the left end of the piston rod. A compression spring is provided between the right end of the piston head and the cover. A connecting pipe that penetrates the housing is provided at the upper left of the central cylinder. A four-way pipe is provided at the upper port of the connecting pipe. An inflation check valve, a pressure relief valve and a first pressure gauge are respectively provided at the remaining ports of the four-way pipe. A second pressure gauge is provided on the right housing.

[0005] Compared with the prior art, the beneficial effects of the utility model are as follows: Multiple devices are evenly arranged at specific intervals between the transmission pipelines. The device can respond to the leakage points of the nearby pipelines. The piston head, piston rod and plug will move due to the change of the air pressure difference between the central cylinder and the housing. When the air pressure in the pipeline and the housing decreases due to air leakage, the plug will press against the outlet end of the housing to close the outlet and prevent the gas from continuing to be transported to the leakage point, reducing resource losses. The use end cannot receive gas subsequently, which is convenient for quick response for maintenance. After the leakage point is repaired, the air pressure in the central cylinder is released through the pressure relief valve, so that the plug can be reset to reopen the pipeline. Then, gas is filled into the central cylinder to restore the detection and monitoring state of the device. The device does not need to use electrical equipment and does not require additional resource supply during use, making it safer to use. Description of the Drawings

[0006] Figure 1 It is the main view sectional structure schematic diagram when the outlet of the utility model is open.

[0007] Figure 2 This is the schematic diagram of the front view cross-section when the outlet of the present utility model is closed.

[0008] Figure 3 This is the schematic diagram of the left view cross-section of the present utility model.

[0009] In the figure: 1. Housing; 2. Flange; 3. Support rod; 4. Central tube; 5. Cover; 6. Limiting tube; 7. Piston rod; 8. Plug; 9. Piston head; 10. Compression spring; 11. Connecting pipe; 12. Four-way pipe; 13. Inflation check valve; 14. Pressure relief valve; 15. First pressure gauge; 16. Second pressure gauge. Specific embodiments

[0010] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0011] Please refer to Figures 1-3, the present utility model provides a technical solution: a pipeline air pressure detection device, including a housing 1 that is opposite left and right. The two side ports of the housing 1 are of different sizes. Flange plates 2 are provided at both the left and right ends of the housing 1. The housing 1 is connected through the flange plates 2. The housing 1 is composed of large and small cylinders on both sides and an inclined transition part in the middle. The flange plates 2 are fixed on the two side ports of the housing 1. The larger-diameter ends of the two housings 1 are aligned and connected together through the flange plates 2. The smaller-diameter ends of the housing 1 are used to connect to the external conveying pipeline. The disassembly and assembly between the two housings 1 facilitate the assembly of the device. Symmetrically arranged support rods 3 are provided at the center of the inner side wall of the left housing 1. A central cylinder 4 is provided between the support rods 3. A cover 5 is provided at the right end of the central cylinder 4. The four support rods 3 are symmetrically fixed on the inner side wall of the left housing 1. The central cylinder 4 is fixed at one end inside the support rods 3. The interior of the central cylinder 4 is hollow, with the left end closed and the right end closed by installing the cover 5. A flange connection can be adopted between the cover 5 and the central cylinder 4 to facilitate the assembly of the device. A limiting cylinder 6 is provided in the middle of the cover 5. A piston rod 7 is movably connected inside the limiting cylinder 6. A plug 8 that fits with the housing 1 is provided at the right end of the piston rod 7. A piston head 9 that fits with the central cylinder 4 is provided at the left end of the piston rod 7. The limiting cylinder 6 is fixedly penetrated on the cover 5. The piston rod 7 is supported and restricted by the limiting cylinder 6, so that the piston rod 7 remains horizontal and can move left and right in the limiting cylinder 6. The piston head 9 and the plug 8 are fixed at the left and right ends of the piston rod 7. The right end face of the plug 8 fits with the transition inclined surface of the housing 1. When the plug 8 is pressed to the housing 1 to the right, it can block and seal the outlet of the housing 1. The piston head 9 fits with the inner side wall of the central cylinder 4. A seal is provided between the piston head 9 and the central cylinder 4 to divide the central cylinder 4 into two spaces on the left and right. The left space is airtight, and the right space is communicated with the inside of the housing 1 through the limiting cylinder 6. There will be a certain air pressure when the gas is transmitted in the pipeline and the housing 1. When the air pressure on the left side of the piston head 9 is greater than the air pressure in the housing 1, the piston head 9, the piston rod 7, and the plug 8 will be pushed to the right, so that the plug 8 adheres to the housing 1 to block the outlet of the housing 1. Although the gas transmitted into the housing 1 subsequently will increase the air pressure in the housing 1, it will also further press the plug 8 to the right, and will not affect the blocking state of the plug 8. A compression spring 10 is provided between the right end of the piston head 9 and the cover 5. The two ends of the compression spring 10 are fixed between the piston head 9 and the cover 5. When the compression spring 10 is in a compressed state, it will push the piston head 9 to the left. After releasing the air pressure on the left side of the piston head 9, the compression spring 10 can push the piston head 9 to the left, so that the plug 8 is separated from the housing 1 and the right end outlet of the housing 1 is reopened. A connecting pipe 11 that penetrates the housing 1 is provided at the upper left of the central cylinder 4. A four-way pipe 12 is provided at the upper port of the connecting pipe 11. An inflation one-way valve 13, a pressure relief valve 14, and a first pressure gauge 15 are respectively provided at the remaining ports of the four-way pipe 12. A second pressure gauge 16 is provided on the right housing 1.The connecting pipe 11 is fixedly penetrated on the central cylinder 4 and communicates with the left-side space inside the central cylinder 4. The connecting pipe 11 also penetrates through the housing 1 to connect the left-side space of the central cylinder 4 with the outside. The lower port of the four-way pipe 12 is connected to the connecting pipe 11. The inflation check valve 13, the pressure relief valve 14, and the first pressure gauge 15 are respectively fixed on the remaining three ports of the four-way pipe 12. The inflation check valve 13 is connected to an external inflation device and can inflate the left-side space of the central cylinder 4. Opening the pressure relief valve 14 can reduce the air pressure in the left-side space of the central cylinder 4 to the atmospheric pressure level at the lowest. The first pressure gauge 15 is used to display the air pressure level in the left-side space of the central cylinder 4 to avoid over-inflation. The second pressure gauge 16 is fixed on the right-side housing 1 and is used to display the air pressure level inside the housing 1. The air pressure at the inlet end of the leakage point will be higher than the normal air pressure because it cannot circulate, and the air pressure at the outlet end of the leakage point will be lower than the normal air pressure, so as to facilitate finding the position of the leakage point.

[0012] Working principle: The housing 1 with the connecting pipe 11 is the inlet end, and the other housing 1 is the outlet end. A plurality of such devices are evenly arranged between the transmission pipelines at a specific interval. When the gas is normally transmitted in the transmission pipeline, there will be a certain air pressure level. Connect the external inflation device to the inflation check valve 13 to increase the air pressure in the left space of the central cylinder 4, but it cannot be higher than the air pressure in the transmission pipeline. It can be observed through the first pressure gauge 15. If the inflation is excessive, the air pressure can be reduced through the pressure relief valve 14. Since the air pressure in the transmission pipeline is higher than the air pressure in the left space of the central cylinder 4, the piston head 9, the piston rod 7 and the plug 8 are pushed to the left, and the plug 8 is separated from the right end outlet of the housing 1, and the conveyed gas can flow and be transmitted normally in the pipeline and the housing 1. When a leak occurs at a certain position, the air pressure in the transmission pipeline drops due to gas leakage, and the air pressure in the housing 1 near the leak point will also drop accordingly. When the air pressure in the left space of the central cylinder 4 is higher than the air pressure in the housing 1, the piston head 9, the piston rod 7 and the plug 8 will be pushed to the right, and the plug 8 will be blocked at the outlet end of the housing 1 by overcoming the elastic force of the compression spring 10 to prevent the gas from being transmitted to the leak point. Although the air pressure in the housing 1 will increase when the subsequent gas is transmitted into the housing 1, it will also further exert pressure on the plug 8 to the right, which will not affect the sealing state of the plug 8. Since the pipeline is blocked, the user end cannot receive gas, and the troubleshooting work can be started. The second pressure gauge 16 shows the air pressure level inside the housing 1. The air pressure at the inlet end of the leak point will be higher than the normal air pressure because it cannot circulate, and the air pressure at the outlet end of the leak point will be lower than the normal air pressure, so as to facilitate finding the leak point. After the leak point is repaired, open the exhaust valve to make the air pressure in the left space of the central cylinder 4 the same as the atmospheric pressure, and the air pressure in the pipeline at the leak point will also approach the atmospheric pressure. The pressure exerted by the air pressure in the housing 1 on the piston head 9 to the left is roughly the same as and slightly smaller than the pressure exerted on the plug 8 to the right. The compression spring 10 will push the piston head 9, the piston rod 7 and the plug 8 to the left, so that the plug 8 is separated from the housing 1 and the pipeline circulation is restored. After the air pressure in the transmission pipeline returns to normal, replenish the air pressure into the central cylinder 4 through the inflation check valve 13 again.

[0013] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline air pressure detection device, comprising a left and right housing (1) opposite to each other, characterized in that: The two side ports of the shell (1) are one large and one small. The left and right ends of the shell (1) are both provided with flanges (2). The shells (1) are connected via the flanges (2). The inner wall of the shell (1) on the left side is provided with support rods (3) symmetrically. A central tube (4) is provided between the support rods (3). A sealing cover (5) is provided at the right end of the central tube (4). A limiting tube (6) is provided in the middle of the sealing cover (5). A piston rod (7) is movably connected to the inner side of the limiting tube (6). A plug that matches the shell (1) is provided at the right end of the piston rod (7). A piston head (8) is provided at the left end of the piston rod (7) and is matched with the central tube (4); a compression spring (10) is provided between the right end of the piston head (9) and the sealing cover (5); a connecting pipe (11) penetrating the shell (1) is provided at the upper left of the central tube (4); a four-way pipe (12) is provided at the upper end of the connecting pipe (11); an inflation check valve (13), a pressure relief valve (14) and a first air pressure gauge (15) are respectively provided on the remaining ports of the four-way pipe (12); and a second air pressure gauge (16) is provided on the shell (1) on the right side.

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