Experimental device for simulating pipeline leakage

Abstract

The invention discloses an experimental device for simulating pipeline leakage. The experimental device is characterized by comprising a pipeline main body, a flange plate, an air pipe connecting device, a cable passing device, a valve device and a control module, the pipeline main body consists of a plurality of sections of steel pipelines which are connected and fixed through flange plates, and the flange plates are sealed through sealing gaskets; the air pipe connecting device and the cable passing device are installed and fixed through a flange plate steel plate at the front end. The valve device is installed and fixed through a rear end flange plate steel plate. The control module comprises an air pump and a valve, the valve injects water into the pipeline, and the air pump pressurizes the interior of the pipeline; the pipeline main body is filled with water through the valve in advance, the air pump applies pressure to the pipeline main body through the air pipe connecting device to simulate the internal pressure of the water supply pipeline, the real pipeline fluid leakage condition is simulated by controlling opening and closing of the valve, and the device is simple in structure, convenient to use and high in fitting degree with the actual condition.

Description

Technical Field

[0001] The invention relates to the technical field of pressurized pipeline detection, in particular to a simulated pipeline leakage experimental device. Background Art

[0002] At present, underground water pipes are an important part of urban underground pipelines. Most of them are buried deep underground. When we conduct leakage detection experiments on them, we need to dig the land to expose the pipes. This experimental method is not only time-consuming and laborious, but also limited by the field experimental environment, and the experimental effect is not satisfactory. Therefore, an experimental device that simulates actual pipeline leakage is proposed to study leakage detection. Summary of the invention

[0003] In view of the defects existing in the existing pipeline leakage detection experiments, the present invention provides a simulated pipeline leakage experimental device with high detection flexibility and good experimental effect.

[0004] To achieve the above-mentioned purpose, the present invention proposes a simulated pipeline leakage experimental device, including a pipeline body, a flange, an air pipe connecting device, a cable passing device, a valve device, and a control module; the pipeline body is composed of multiple sections of steel pipes connected and fixed by flanges, and the flanges are sealed by sealing gaskets; the air pipe connecting device and the cable passing device are installed and fixed by a front-end flange steel plate; the valve device is installed and fixed by a rear-end flange steel plate; the control module includes an air pump and a valve, the valve injects water into the pipeline, and the air pump pressurizes the pipeline.

[0005] Furthermore, the control module fills the pipeline with water through the valve, adjusts the air pump to make the simulated pipeline reach a predetermined pipeline pressure, and comprehensively adjusts the valve opening degree and the internal pressure of the pipeline to simulate different pipeline leakage conditions. The liquid leakage rate Q0 in the pipeline is:

[0006]

[0007] Where: Q0—liquid leakage rate, kg / s; C d —Liquid leakage coefficient, in this experiment the value is selected as 1;

[0008] A ρ —Rip area, m 2 ; ρ—leakage liquid density, kg / m 3 ; P—pressure of medium in container, Pa;

[0009] P0—ambient pressure, Pa; g—gravitational acceleration, g=9.8m / s 2 ; h—liquid level height above the crack, m.

[0010] Furthermore, the pipeline body includes a steel pipeline, a flange, and a sealing gasket; flanges are welded at both ends of the steel pipeline, and the flanges are sealed by sealing gaskets and fixedly connected by bolts; circular steel plates with through holes are welded to the front and rear end flanges of the pipeline body, and the circular steel plates are used to install air pipe connecting devices, cable passing devices and valves.

[0011] Furthermore, the air pipe connecting device includes an air pipe joint, a joint connector, and a nut fixing; the nut fixing fixes the joint connector to the front end flange steel plate; one end of the air pipe joint is connected to the high-pressure air pump through an air pipe to provide pipeline pressure, and the other end is fixed to the joint connector through threads.

[0012] Furthermore, the air pipe joint is sealed with the joint connector through an accompanying sealing ring, and the joint connector is sealed with the flange through an accompanying sealing ring.

[0013] Furthermore, the cable passing device includes a cable fixing part and a sealing ring fixing part; the cable fixing part is fixed by bolts of the front end flange steel plate and a sealing ring groove is left at the middle wire hole; the sealing ring fixing part is installed at the sealing ring groove of the cable fixing part, and the cable passing device is used to detect the cable dragged by the robot entering the inside of the pipeline and maintain the sealing.

[0014] Furthermore, the valve device includes a valve and a single-ended thread; the valve is installed and fixed by the single-ended thread of the rear end flange steel plate.

[0015] Furthermore, the control module adjusts the parameters of the experimental device by controlling the air pump and the valve, injects water into the pipeline by fixing the valve with the single-head thread, and pressurizes the pipeline through the air pump connected to the air pipe joint.

[0016] The beneficial effects of the present invention are:

[0017] Compared with the prior art, the present invention controls the air pump through the control module to provide adjustable pressure inside the pipeline, so that the experimental device can obtain the same internal pressure as the actual water supply pipeline, providing better accuracy for the experiment. The valve of this experimental device simulates the leakage of the pipeline, and simulates cracks of different apertures in the pipeline according to the different degrees of valve opening, which facilitates the study of experimental data of leakage caused by different average apertures. In addition, the present invention reserves a cable passing device to facilitate the cable dragged by the pipeline detection robot to enter the interior of the pipeline and maintain sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 This is a schematic diagram of the overall structure of a simulated pipeline leakage experimental device of the present invention;

[0019] Attached Figure 2This is a schematic diagram of the installation of a gas pipe connection device of a simulated pipeline leakage experimental device of the present invention;

[0020] Attached Figure 3 A schematic diagram of the installation of a cable through-device of a simulated pipeline leakage experimental device of the present invention;

[0021] Attached Figure 4 A schematic diagram of the installation of a valve device of a simulated pipeline leakage experimental device of the present invention;

[0022] Description of reference numerals:

[0023] 1-steel pipe; 2-middle connecting flange; 3-sealing gasket; 4-front flange; 5-rear flange; 6-round steel plate; 11-trachea joint; 12-joint connector; 13-nut fixing; 21-cable fixing; 22-sealing ring fixing; 31-single-end thread. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings.

[0025] In order to fully express the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be described in full and clearly in conjunction with the drawings of the invention examples. Obviously, the embodiments described below are part of the embodiments of the present invention, but not all complete 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.

[0026] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a simulated pipeline leakage test device, which specifically comprises a pipeline body, a flange, a branch pipe connecting device, a cable passing device, and a valve device.

[0028] Figure 1 As shown, the pipeline body includes a steel pipeline 1, a middle connecting flange 2, and a sealing gasket 3; flanges 2 are welded at both ends of the steel pipeline 1, and the flanges 2 are fixedly connected by bolts and sealed by the sealing gasket 3; the front and rear end flanges 4 and 5 of the pipeline body are each welded with a circular steel plate 6 with a through hole. The circular steel plates are each provided with a through hole for installing a gas pipe connection device, a cable passing device, and a valve.

[0029] Figure 2As shown, the air pipe connecting device includes an air pipe joint 11, a joint connector 12, and a nut fixing 13; the sleeve joint 11 is fixed to the joint connector 12 by threads; the nut fixing 13 fixes the joint connector 12 to the front end flange steel plate 4, and the air pipe joint, the joint connector and the front end flange steel plate are all sealed with sealing rings.

[0030] Figure 3 As shown, the cable passing device includes a cable fixing part 21 and a sealing ring fixing part 22; the cable fixing part 21 is fixed by bolts welded to the front steel plate and a sealing ring groove is left at the wire hole; the sealing ring fixing part 22 is installed on the cable fixing part 21 by threaded connection. The cable dragged by the pipeline inspection robot can enter the pipeline from the device and keep the internal pressure of the pipeline unchanged.

[0031] Figure 4 As shown, the valve device includes a valve and a single-end thread 31; the valve is installed and fixed by welding the single-end thread 31 to the rear end steel plate.

[0032] The working process of the present invention is as follows:

[0033] First, fix the simulated pipeline leakage device, put the pipeline detection robot required for the experiment into the pipeline experimental device, and the cable dragged by the robot passes through the cable fixings to connect to the ground workstation. The cable fixings and the T-nuts welded on the flange are fixed with bolts, and the sealing rings are installed to achieve the sealing between the cables and the cable fixings, and between the cable fixings and the flange. The robot can move freely in the pipeline through the cable fixings.

[0034] Secondly, the sleeve joint is connected to the joint connector through threads, and the sealing ring attached to the sleeve joint is used to achieve sealing with the joint connector. Finally, the joint connector is passed through the small hole opened in the flange and installed and fixed with the nut fixing part, during which the sealing ring set on the joint connector is used to achieve sealing with the flange.

[0035] Then, the pipeline is filled with water through the single-head threaded valve installed on the rear end flange. After the pipeline is filled, the valve is disconnected and closed, and the pipeline is pressurized by an air pump connected to the air pipe joint. The air pressure of the air pump is adjusted to make the experimental device reach the predetermined pipeline pressure. After the internal pressure of the pipeline is stable, the valve is opened, and the liquid inside the pipeline is ejected under the action of pressure. The degree of valve opening and the internal pressure of the pipeline are comprehensively adjusted to simulate different pipeline leakage situations. At this time, the pipeline detection robot starts to work, collect experimental data, and perform operations such as collecting audio and images.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A simulated pipeline leakage experimental device, characterized in that: It comprises a pipeline body, a flange, an air pipe connecting device, a cable passing device, a valve device, and a control module; the pipeline body is composed of multiple sections of steel pipelines (1) connected and fixed by flanges, and the flanges are sealed by sealing gaskets (3); the air pipe connecting device and the cable passing device are installed and fixed by the front flange (4) steel plate; the valve device is installed and fixed by the rear flange (5) steel plate; the control module comprises an air pump and a valve, the valve injects water into the pipeline, and the air pump pressurizes the pipeline.

2. The simulated pipeline leakage experimental device according to claim 1 is characterized in that: The control module fills the pipeline with water through the valve, adjusts the air pump to make the simulated pipeline reach the predetermined pipeline pressure, and comprehensively adjusts the valve opening degree and the internal pressure of the pipeline to simulate different pipeline leakage conditions. The liquid leakage rate Q0 in the pipeline is: Where: Q0—liquid leakage rate, kg / s; C d —Liquid leakage coefficient, in this experiment the value is selected as 1; A ρ —Rip area, m 2 ; ρ—leakage liquid density, kg / m 3 ; P—pressure of medium in container, Pa; P0—ambient pressure, Pa; g—gravitational acceleration, g=9.8m / s 2 ; h—liquid level height above the crack, m.

3. The simulated pipeline leakage experimental device according to claim 1, characterized in that: The pipeline body comprises a steel pipeline (1), a flange, and a sealing gasket (3); flanges are welded at both ends of the steel pipeline (1), and the flanges are sealed by the sealing gasket (3) and fixedly connected by bolts; a circular steel plate (6) with a through hole is welded to the front and rear end flanges of the pipeline body, and the circular steel plate (6) is used to install an air pipe connection device, a cable passing device and a valve.

4. The simulated pipeline leakage experimental device according to claim 1 is characterized in that: The air pipe connection device comprises an air pipe joint (11), a joint connection piece (12), and a nut fixing piece (13); the nut fixing piece (13) fixes the joint connection piece (12) to the front end flange (4) steel plate; one end of the air pipe joint (11) is connected to a high-pressure air pump through an air pipe to provide pipeline pressure, and the other end is fixed to the joint connection piece (12) through a thread.

5. The simulated pipeline leakage experimental device according to claim 3 is characterized in that: The air pipe joint (11) is sealed with the joint connector (12) via an attached sealing ring, and the joint connector (12) is sealed with the flange via an attached sealing ring.

6. The simulated pipeline leakage experimental device according to claim 1, characterized in that: The cable passing device comprises a cable fixing part (21) and a sealing ring fixing part (22); the cable fixing part (21) is fixed by bolts of a front flange (4) steel plate and a sealing ring groove is left at a middle wire hole; the sealing ring fixing part (22) is installed at the sealing ring groove of the cable fixing part (21), and the cable passing device is used to detect that a cable dragged by a robot enters into a pipeline and maintains sealing.

7. The simulated pipeline leakage experimental device according to claim 1 is characterized in that: The valve device comprises a valve and a single-ended thread (31); the valve is installed and fixed via the single-ended thread (31) of the steel plate of the rear end flange (5).

8. The simulated pipeline leakage experimental device according to claim 1, characterized in that: The control module adjusts the parameters of the experimental device by controlling the air pump and the valve, injects water into the pipeline by installing a fixed valve with the single-end thread (31), and pressurizes the pipeline through the air pump connected to the air pipe joint (11).

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