1. A pipeline damage detection apparatus, comprising:

a mounting seat;

the sealing element extends along the length direction of the mounting seat, and is provided with a connecting end arranged in the mounting seat and a measuring end protruding out of the mounting seat, and the measuring end is used for extending into a pipeline to be measured so as to seal the pipeline to be measured;

the hydraulic injection structure is arranged at two opposite ends of the sealing element in the length direction and is in sealing connection with the sealing element, the hydraulic injection structure is provided with an input end and an output end, and the output end is arranged close to the measuring end and is used for filling fluid into a pipeline to be measured; and the number of the first and second groups,

the detection device comprises a fiber grating sensor and a controller, wherein the fiber grating sensor is arranged at the measuring end, and the detection device is used for receiving the stress signal of the pipeline to be detected so as to detect the pipeline damage condition of the pipeline to be detected.

2. The pipeline damage detection device of claim 1, wherein the sealing element comprises an airbag disposed on the mounting seat, the connecting end and the measuring end are respectively formed at two opposite ends of the airbag in the length direction, and an inflation port is formed at the connecting end of the airbag.

3. The pipeline damage detection device of claim 2, wherein the mounting seat has a mounting cavity, the mounting cavity is a tubular mounting cavity, and the air bag is disposed in the mounting cavity.

4. The pipeline damage detection device of claim 2, wherein the plurality of inflation ports are uniformly distributed on one side of the connecting end away from the measuring end;

the airbag also comprises an inflation tube, the inflation tube is provided with a plurality of inflation branches and an inflation main path communicated with the inflation branches, and each inflation branch is correspondingly communicated with each inflation opening.

5. The pipe damage detection apparatus of claim 2, wherein the hydraulic injection structure comprises a hydraulic injection tube extending along a length of the balloon, one opening of the hydraulic injection tube near the measurement end forming the output end, the other opening of the hydraulic injection tube near the mounting end forming the input end.

6. The pipeline damage detection device of claim 2, wherein two opposite ends of the air bag in the length direction are respectively provided with a mounting hole, each mounting hole is provided with a sealing ring, two ends of the hydraulic injection pipe respectively penetrate through the corresponding sealing ring, and each sealing ring is used for sealing and connecting the hydraulic injection pipe and the air bag.

7. The pipeline damage detection device of claim 2, wherein the fiber grating sensor is uniformly wound around the measurement end of the air bag to form a plurality of measurement areas with the pipeline to be measured.

8. The pipeline damage detection device of claim 7, wherein the fiber grating sensor comprises a fiber core, a plurality of strain gauges disposed on the fiber core, and a fiber cladding sleeved on the fiber core, and each strain gauge is configured to receive a back stress signal reflected by the pipeline to be detected.

9. A pipe damage detection method based on the pipe damage detection device according to any one of claims 1 to 8, comprising:

extending the measuring end of the sealing element into the tube cavity of the pipeline to be measured and sealing the tube cavity of the pipeline to be measured;

filling fluid into a pipe cavity of the pipeline to be tested by using a hydraulic injection structure, and acquiring first fluid pressure of the hydraulic injection structure;

receiving a first reflected signal set of the pipeline to be detected;

continuously filling fluid into the pipe cavity of the pipeline to be tested by using a hydraulic injection structure, and acquiring second fluid pressure of the hydraulic injection structure;

receiving a second reflected signal set of the pipeline to be detected;

outputting the damage condition of the pipeline to be detected according to the first reflection signal set and the second reflection signal set; wherein the second fluid pressure is greater than the first fluid pressure.

10. The pipeline damage detection method according to claim 9, wherein the first fluid pressure is P1, the pressure in the bladder is P2, the area of the end portion of the bladder is a1, the contact area of the measurement end and the pipeline to be measured is a2, the contact area of the connection end and the mounting seat is A3, the friction coefficient of the outer surface of the bladder is f, P1, P2, a1, a2, A3 and f, and the following relationships are satisfied: p2 (a2+ A3) f > P1 a 1.

Background

Currently, in pipeline damage detection construction, a radiation inspection method and an ultrasonic inspection method are generally adopted. For the pipeline penetrating through the partition plate structure, when the construction space on one side of the partition plate is insufficient, damage detection construction can be carried out only on the other side of the partition plate wall, and an ultrasonic flaw detection method cannot be applied because the damage part cannot be approached; when other metal parts are directly attached to the pipeline on one side of the partition wall with insufficient construction space, the detection result of the radiographic inspection method is inaccurate due to the interference of the metal parts.

Disclosure of Invention

The invention provides a pipeline damage detection device and a pipeline damage detection method, which are used for solving the problems of complex pipeline damage testing steps and low testing efficiency in the prior art, improving the working efficiency of a damage detection test and reducing the workload of the damage test.

To solve the problems in the prior art, an embodiment of the present invention provides a pipeline damage detection device, including:

a mounting seat;

the sealing element extends along the length direction of the mounting seat, and is provided with a connecting end arranged in the mounting seat and a measuring end protruding out of the mounting seat, and the measuring end is used for extending into a pipeline to be measured so as to seal the pipeline to be measured;

the hydraulic injection structure is arranged at two opposite ends of the sealing element in the length direction and is in sealing connection with the sealing element, the hydraulic injection structure is provided with an input end and an output end, and the output end is arranged close to the measuring end and is used for filling fluid into a pipeline to be measured; and the number of the first and second groups,

the detection device comprises a fiber grating sensor and a controller, the fiber grating sensor is arranged at the measuring end, and the detection device is used for receiving the stress signal of the pipeline to be detected so as to detect the pipeline damage condition of the pipeline to be detected

According to the pipeline damage detection device provided by the invention, the sealing element comprises an air bag arranged on the mounting seat, the connecting end and the measuring end are respectively formed at two opposite ends of the air bag in the length direction, and an inflation inlet is formed at the connecting end of the air bag.

The pipeline damage detection equipment is characterized in that the mounting seat is provided with a mounting cavity, the mounting cavity is a tubular mounting cavity, and the air bag is arranged in the mounting cavity.

According to the pipeline damage detection device provided by the invention, a plurality of inflation ports are arranged, and the inflation ports are uniformly distributed on one side of the connecting end, which is far away from the measuring end;

the airbag also comprises an inflation tube, the inflation tube is provided with a plurality of inflation branches and an inflation main path communicated with the inflation branches, and each inflation branch is correspondingly communicated with each inflation opening.

According to the pipeline damage detection device provided by the invention, the hydraulic injection structure comprises a hydraulic injection pipe, the hydraulic injection pipe extends along the length direction of the air bag, one opening of the hydraulic injection pipe close to the measuring end forms the output end, and the other opening of the hydraulic injection pipe close to the mounting end forms the input end.

According to the pipeline damage detection device provided by the invention, two ends of the air bag, which are oppositely arranged in the length direction, are respectively provided with the mounting holes, the mounting holes are respectively provided with the sealing rings, two ends of the hydraulic injection pipe are respectively penetrated through the corresponding sealing rings, and the sealing rings are respectively used for sealing and connecting the hydraulic injection pipe and the air bag.

According to the pipeline damage detection device provided by the invention, the fiber bragg grating sensors are uniformly wound at the measuring end of the air bag and are used for forming a plurality of measuring areas with the pipeline to be measured.

According to the pipeline damage detection equipment provided by the invention, the fiber bragg grating sensor comprises a fiber core, a plurality of strain gauges arranged on the fiber core and a fiber cladding sleeved on the fiber core, wherein each strain gauge is used for receiving a reflected back stress signal of a pipeline to be detected.

Based on the pipeline damage detection device, the invention also provides a pipeline damage detection method, which comprises the following steps:

extending the measuring end of the sealing element into the tube cavity of the pipeline to be measured and sealing the tube cavity of the pipeline to be measured;

filling fluid into a pipe cavity of the pipeline to be tested by using a hydraulic injection structure, and acquiring first fluid pressure of the hydraulic injection structure;

receiving a first reflected signal set of the pipeline to be detected;

continuously filling fluid into the pipe cavity of the pipeline to be tested by using a hydraulic injection structure, and acquiring second fluid pressure of the hydraulic injection structure;

receiving a second reflected signal set of the pipeline to be detected;

outputting the damage condition of the pipeline to be detected according to the first reflection signal set and the second reflection signal set; wherein the second fluid pressure is greater than the first fluid pressure.

According to the pipeline damage detection method provided by the invention, the first fluid pressure is P1, the pressure in the air bag is P2, the end part area of the air bag is A1, the contact area of the measuring end and the pipeline to be detected is A2, the contact area of the connecting end and the mounting seat is A3, the friction coefficient of the outer surface of the air bag is f, and the following relations are satisfied: p2 (a2+ A3) f > P1 a 1.

According to the pipeline damage detection equipment provided by the invention, the installation seat is used as the extension of the pipeline to be detected, so that a sufficient friction area is provided for the sealing element, and the damage detection requirement of the high-pressure pipeline can be met; the fiber grating sensor is arranged in the pipeline to be detected, so that the problems that the pipeline with the damaged part difficult to attach is difficult to implement damage detection and the damage detection of the pipeline with the damaged part interfered by nearby structures is inaccurate can be solved; in addition, fluid is filled into the pipeline to be detected through the hydraulic injection pipe, and damage detection of the pipeline to be detected under different pressure conditions can be achieved. The pipeline damage detection equipment provided by the invention can greatly improve the working efficiency of pipeline damage tests and reduce the workload of the pipeline damage tests.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a pipeline damage detection device provided by the present invention;

FIG. 2 is a schematic view of the assembled structure of FIG. 1;

fig. 3 is a flow chart of the pipeline damage detection method provided by the invention.

Reference numerals:

1: a pipeline damage detection device; 2: a mounting seat; 3: a seal member;

4: a hydraulic injection structure; 5: a detection device; 6: a pipeline to be tested;

7: a connecting end; 8: a measuring end; 9: an inflation inlet;

10: mounting holes; 11: an inflation tube; 12: an input end;

13: an output end; 14: a hydraulic injection pipe; 15: a fiber grating sensor;

16: a controller; 17: an air bag.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The pipe damage detecting apparatus 1 and the pipe damage detecting method of the present invention are described below with reference to fig. 1 to 3.

When carrying out damage measurement to the pipeline, pipeline 6 that awaits measuring generally has a sealed end, is provided with valve or shutoff mechanism at this end, and the other end is the open end for fill fluid conveniently carries out damage test to pipeline 6 that awaits measuring, and the fluid of filling under the general condition can set up the fluid that pipeline 6 that awaits measuring filled into under the normal behavior, is favorable to detecting the damage condition of pipeline 6 that awaits measuring under the normal behavior.

Referring to fig. 1-2, a pipeline damage detection device 1 provided by the present invention includes a mounting base 2; sealing member 3, along the length direction extension of mount 2, sealing member 3 has a link 7 of locating in mount 2, and the measurement end 8 of protrusion mount 2. It should be noted that, the damage measurement of the pipeline generally measures the damage condition of the pipeline under the normal working condition, so the open end of the pipeline 6 to be measured needs to be plugged and filled with fluid to create the measurement environment of the pipeline 6 to be measured under the normal working condition. In the technical scheme provided by the invention, the measuring end 8 is used for extending into the pipeline 6 to be measured and contacting with the pipe wall of the pipeline 6 to be measured so as to seal the pipeline 6 to be measured.

Hydraulic pressure pours into structure 4, runs through to be located sealing member 3 and be the both ends of relative setting on length direction, and with sealing member 3 sealing connection, hydraulic pressure pours into structure 4 and has input 12 and output 13, and output 13 is close to the measuring end 8 setting for fill fluid in to the pipeline 6 that awaits measuring.

The detection device 5 comprises a fiber grating sensor 15 and a controller 16, the fiber grating sensor 15 is arranged at the measuring end 8, and the detection device 5 can receive stress signals of the pipeline to be detected under different pipeline pressures so as to detect the pipeline damage condition of the pipeline to be detected 6. In the actual measurement process, a section of sealed space is formed between the pipeline 6 to be measured and the sealing element 3 through the plugging of the air bag 17, fluid is filled into the sealed space through the hydraulic injection structure 4, the fiber grating sensor 15 is used for acquiring a stress signal of the pipeline 6 to be measured, the fluid is continuously filled into the sealed space to change the pipeline pressure in the sealed space, and at the moment, the fiber grating sensor 15 is used for acquiring the stress signal of the pipeline 6 to be measured. If the pipe is damaged greatly, the state of damage to the pipe changes when the pressure in the pipe changes, and the stress signal changes. If the two stress signals have difference and the difference is larger, the pipeline has larger damage, and if the difference of the two stress signals is smaller, the pipeline has smaller damage or no damage.

The sealing element 3 only needs to have the effect of plugging the pipeline 6 to be tested, the sealing element 3 can be set to be various, in the technical scheme provided by the invention, the sealing element 3 comprises an air bag 17 arranged on the mounting seat 2, two ends of the air bag 17 which are oppositely arranged in the length direction form a connecting end 7 and a measuring end 8 respectively, and the connecting end 7 of the air bag 17 is provided with an inflation inlet 9. Because the surface of the air bag 17 has friction, after the air bag 17 is inflated, the outer surface of the air bag 17 is attached to the pipe wall of the pipeline 6 to be tested, and the sealing performance of the pipeline 6 to be tested is ensured. In addition, the start and the end of the test can be conveniently controlled by inflating and exhausting the air bag 17, and the efficiency of the damage test is improved. The sealing element 3 may also be a sealing plug, one end of which is disposed on the mounting seat 2, and the other end of which is disposed on the to-be-tested pipeline 6, which is not limited in the present invention.

Further, the mounting seat 2 has a mounting cavity, the mounting cavity is a tubular mounting cavity, and the airbag 17 is arranged in the mounting cavity. It should be noted that the mounting base 2 may be tubular, and thus the lumen of the mounting base 2 is a tubular mounting cavity; the mounting base 2 can also be set to other shapes, such as a cuboid, and at the moment, only a tubular mounting cavity needs to be arranged inside the mounting base 2. The tubular installation cavity is used for matching the shape of the air bag 17, the inner wall of the tubular installation cavity is smooth, and a good fitting effect is easily generated between the tubular installation cavity and the air bag 17; in addition, the shape consistency of the installation cavity arranged in the tubular mode and the tube cavity in the pipeline 6 to be tested is kept, the deformation of each part of the air bag 17 during inflation and the pressure of the air bag 17 are kept consistent and stable, and the service life of the air bag 17 can be prolonged.

As described above, the air bag 17 is provided with the inflation ports 9 to facilitate inflation of the air bag 17, in the technical scheme provided by the invention, the inflation ports 9 are provided in plurality, the inflation ports 9 are uniformly distributed on one side of the connecting end 7 away from the measuring end 8, and the air bag 17 can be uniformly inflated by arranging the inflation ports 9, so that the air bag 17 is more tightly attached to the pipeline 6 to be tested or the mounting seat 2, and the improvement of the testing efficiency is facilitated. In addition, the uniform and distributed inflation helps to prolong the service life of the airbag 17 and prevent the airbag 17 from exploding due to sudden increase of the gas amount. Further, the airbag 17 further includes an inflation tube 11, the inflation tube 11 has a plurality of inflation branches and an inflation main path communicated with the plurality of inflation branches, each inflation branch is correspondingly communicated with each inflation port 9, and in the actual use process, an inflation device can be used to communicate the inflation main path, so as to continuously input gas to each inflation port 9.

Specifically, the hydraulic pressure injection structure 4 includes a hydraulic pressure injection pipe 14, the hydraulic pressure injection pipe 14 extends along the length direction of the airbag 17, openings at both ends of the hydraulic pressure injection pipe 14 form the input end 12 and the output end 13, respectively, one opening of the hydraulic pressure injection pipe 14 near the measurement end 8 forms the output end 13, and the other opening of the hydraulic pressure injection pipe 14 near the connection end 7 forms the input end 12. In the technical scheme provided by the invention, two ends of the air bag 17 which are oppositely arranged in the length direction are respectively provided with a mounting hole 10, and two ends of the hydraulic injection pipe 14 are respectively penetrated through the corresponding mounting holes 10 and are in sealing connection with the air bag 17. Sealing rings are arranged at the mounting holes 10, two ends of the hydraulic injection pipe 14 penetrate through the corresponding sealing rings respectively, and the sealing rings can be used for sealing and connecting the hydraulic injection pipe 14 and the air bag 17, so that the hydraulic injection pipe 14 or the air bag 17 can be conveniently detached; the mounting hole 10 may be provided with a thermal melting material, and the hydraulic injection pipe 14 and the air bag 17 may be connected by thermal melting, which may be selected by a user according to actual working conditions, but the present invention is not limited thereto. In addition, in the technical scheme provided by the invention, the hydraulic pressure injection pipe 14 is a rigid hydraulic pressure injection straight pipe, and the extension direction of the rigid hydraulic pressure injection straight pipe is parallel to the extension direction of the air bag 17. By the arrangement, the situation that the hydraulic injection pipe 14 damages the air bag 17 and affects the test can be prevented.

Specifically, the fiber grating sensor 15 is uniformly wound around the measuring end 8 of the air bag 17, and is used for forming a plurality of measuring areas with the pipeline 6 to be measured. The fiber grating sensor 15 includes a fiber core, a plurality of strain gauges disposed on the fiber core, and a fiber cladding sleeved on the fiber core, and each strain gauge is used for receiving a stress signal of the pipeline 6 to be measured. It should be noted that the fiber grating sensor 15 is wound around the measuring end 8, and forms a plurality of contact points with the pipe 6 to be measured, that is, a plurality of measuring areas, each measuring area correspondingly includes a plurality of strain gauges, and each strain gauge can receive stress information of the pipe 6 to be measured.

Referring to fig. 3, based on the pipeline damage detection device 1, the present invention further provides a pipeline damage detection method, including:

s10, extending the measuring end of the sealing element into the lumen of the pipeline to be measured and sealing the lumen of the pipeline to be measured;

s20, filling fluid into the cavity of the pipeline to be tested by using a hydraulic injection structure, and acquiring first fluid pressure of the hydraulic injection structure;

s30, receiving a first reflection signal set of the pipeline to be detected;

s40, continuously filling fluid into the cavity of the pipeline to be tested by using a hydraulic injection structure, and acquiring a second fluid pressure of the hydraulic injection structure;

s50, receiving a second reflected signal set of the pipeline to be detected;

s60, outputting the damage condition of the pipeline to be detected according to the first reflection signal set and the second reflection signal set; wherein the second fluid pressure is greater than the first fluid pressure.

As described above, a plurality of detection areas are formed between the fiber grating sensor 15 and the pipe 6 to be measured, and since each detection area corresponds to a plurality of strain gauges, a signal of each detection area is reflected as a signal set. In the actual measurement process, a section of sealed space is formed between the sealing element 3 and the pipeline 6 to be measured, fluid is filled into the sealed space through the hydraulic injection structure 4, and the pressure change of the pipeline in the space can be continuously caused. It should be noted that, in the case that the sealing member 3 is an air bag 17, the measuring end 8 of the air bag 17 needs to be inserted into the pipeline 6 to be measured, and the air bag 17 is inflated so that the air bag 17 blocks the pipeline 6 to be measured. In the actual detection process, the first fluid pressure is set to be P1, and under P1, the fiber grating sensor 15 can receive a first reflected signal set of the pipeline 6 to be detected; assuming that the second fluid pressure is P2, at P2, the fiber grating sensor 15 can receive a second reflected signal set of the pipe 6 to be measured. Since P2 is greater than P1, if there is severe damage to the pipeline, the pipeline damage will change if the pressure in the pipeline rises, thus also causing a change in the reflected signal set. Therefore, if the second reflected signal set is close to the first reflected signal set, it is proved that the condition of the pipeline 6 to be tested is good, and if the difference between the second reflected signal set and the first reflected signal set is large, it is proved that the damage condition of the pipeline 6 to be tested is serious. It should be noted that, in order to improve the measurement accuracy, the above steps may be repeated many times in the testing process to obtain a plurality of different sets of reflected signals, and the damage condition of the pipeline 6 to be measured can be reflected more intuitively and accurately by comparing the plurality of sets of different reflected signals.

Further, during the measurement, the first fluid pressure is P1, the pressure inside the bladder 17 is P2, the end area of the bladder 17 is a1, the contact area of the measurement end 8 and the measured pipeline is a2, the contact area of the connection end 7 and the mounting seat 2 is A3, the friction coefficient of the outer surface of the bladder 17 is f, and P1, P2, a1, a2, A3 and f satisfy the following relations: p2 (a2+ A3) f > P1 a 1. In the measurement process, the parameters need to be kept to satisfy the relationship, and in the relationship, the friction force of the air bag 17 is larger than the thrust force generated by the fluid, so that the air bag 17 can be kept static to maintain the test.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.