CN219414457U

CN219414457U - Temperature compensation's monomer formula supersound on-line monitoring device

Info

Publication number: CN219414457U
Application number: CN202320862731.1U
Authority: CN
Inventors: 伍剑波
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-07-25
Anticipated expiration: 2033-04-18

Abstract

The utility model discloses a temperature-compensated single ultrasonic on-line monitoring device, which comprises an explosion-proof cavity, wherein a PCB (printed circuit board) and an explosion-proof battery are arranged in the explosion-proof cavity, and the PCB and the explosion-proof battery are used for controlling the operation of the whole device; the PCB board is connected with an explosion-proof battery; the upper end of the explosion-proof cavity is provided with a first stuffing box; an antenna for signal transmission is arranged inside the first stuffing box; the antenna is connected with the PCB; the lower end of the explosion-proof cavity is fixed on the pipeline through a fixing mechanism; the device also comprises a sensor for measuring the wall thickness and the temperature of the pipeline and a display device for receiving the signal transmitted by the antenna. The utility model has the advantages of simple manufacturing process, low manufacturing cost, simple structure, ingenious design and reasonable layout, is particularly suitable for popularization and application in the field, and has very broad market prospect.

Description

Temperature compensation's monomer formula supersound on-line monitoring device

Technical Field

The utility model relates to the technical field of ultrasonic detection, in particular to a temperature-compensated single ultrasonic on-line monitoring device.

Background

Oil and gas pipelines are important channels for transporting energy sources, and various corrosion defects can occur to the pipelines under the action of complex loads and internal corrosive media during the operation of the pipelines, so that the wall thickness is reduced. If the potential safety hazards such as internal medium leakage and the like cannot be found in time, the potential safety hazards can cause great threat to the safety of human lives and properties and the environment. Therefore, on-line real-time monitoring of the wall thickness change condition of the key part of the oil and gas pipeline is needed, so that the quality condition of the pipeline is mastered in real time, and a foundation is laid for intelligent operation and maintenance of the pipeline.

In the nondestructive testing method of the pipeline, the resistance probe sensor is required to be placed on the inner surface of the pipeline for erosion and abrasion monitoring in the detection of the resistance probe, so that the installation is inconvenient; the detection of the field fingerprint method needs to weld an electrode matrix to a pipe body, and the service life of the pipeline and the corrosion of the outer surface can be influenced; fiber bragg grating detection has strict requirements on measurement environment conditions, poor anti-interference capability and expensive equipment.

At present, the most widely mature technology applied to monitoring the wall thickness of a pipeline is the ultrasonic detection technology. The temperature of the pipeline is changed under the influence of the service environment temperature and the medium temperature in the pipeline, so that the sound velocity of the pipeline is changed, and the detection precision is influenced. Patent document CN217276061U discloses an electromagnetic ultrasonic thickness measuring sensor with temperature sensing, which corrects the ultrasonic sound velocity according to the temperature information measured by a temperature sensor to improve the detection accuracy. However, the device uses a liquid coupling agent, is easy to volatilize and run off, and cannot meet the requirement of long-term real-time monitoring of the wall thickness of the pipeline. Patent document CN213957242U discloses a high-precision pipe wireless corrosion monitor which monitors a pipe by ultrasonic waves, obtains the corrosion condition of the pipe from monitoring the thickness condition of the pipe, and transmits the corrosion condition of the pipe to the background through a wireless transmission module. However, the monitor does not correct the detection data according to the temperature change of the pipeline, so that the detection result is greatly influenced by the temperature, and the evaluation result is influenced.

Patent document CN203964886U discloses an on-line monitoring device for wall thickness corrosion of a high-temperature pipeline by a piezoelectric ultrasonic method, and the monitoring device adopts a waveguide sheet to transmit ultrasonic waves, but two bolts are welded at the center of a measuring point, so that the outer surface of the pipeline is damaged. Meanwhile, the waveguide sheet and the pipeline are in dry ultrasonic coupling, and high clamping pressure is applied to the contact surface of the waveguide sheet and the pipeline through the waveguide sheet clamp, so that the pipeline is deformed, and the service life is shortened. Patent document CN102980538A discloses an on-line monitoring device for wall thickness of high-temperature pipeline, which can realize real-time on-line monitoring of wall thickness of pipeline, but does not have explosion-proof performance, so that the device cannot safely operate under the environment with high explosion-proof requirements such as petroleum and natural gas platforms. Patent document CN113029055a discloses an explosion-proof anti-interference pipeline wall thickness ultrasonic on-line monitoring device, which has a simple structure and strong capability of resisting environmental noise interference, but uses more explosion-proof cables and communication cables, so that on-site wiring is difficult and maintenance of the pipeline is not facilitated.

Therefore, in order to realize effective monitoring of the wall thickness of the oil and gas pipeline, an ultrasonic online monitoring device which has a temperature compensation mechanism, high detection precision, meets the explosion-proof requirement, is convenient to disassemble and maintain and cannot deform and damage the pipeline in the thickness measuring process is needed.

Disclosure of Invention

Aiming at the problems, the utility model provides a temperature-compensated single-body type ultrasonic on-line monitoring device.

The utility model adopts the following technical scheme:

the temperature-compensated single-body type ultrasonic on-line monitoring device comprises an explosion-proof cavity, wherein a PCB (printed circuit board) and an explosion-proof battery for controlling the operation of the whole device are arranged in the explosion-proof cavity; the PCB board is connected with an explosion-proof battery; the upper end of the explosion-proof cavity is provided with a first stuffing box; an antenna for signal transmission is arranged inside the first stuffing box; the antenna is connected with the PCB; the lower end of the explosion-proof cavity is fixed on the pipeline through a fixing mechanism; the device also comprises a sensor for measuring the wall thickness and the temperature of the pipeline and a display device for receiving the signal transmitted by the antenna.

Preferably, the explosion-proof cavity further comprises a shell; the lower end of the shell is provided with a second stuffing box; a first cover plate is arranged at the left end of the shell; the right end of the shell is provided with a second cover plate.

Preferably, the sensor includes an ultrasonic probe and a temperature sensor.

Preferably, the ultrasonic probe is a piezoelectric ultrasonic single crystal straight probe.

Preferably, the fixing mechanism comprises a connecting column, a clamp and a base, and the lower end of the connecting column is connected with the base; the base is fixed on the pipeline through the clamp.

Preferably, a second stuffing box is arranged inside the connecting column.

Preferably, the base is provided with a first through hole; the ultrasonic probe is fixed below the base through the first through hole.

Preferably, the first through hole is stepped.

Preferably, the base is provided with a second through hole; a spring is arranged above the inner part of the second through hole; the upper end and the lower end of the spring are respectively contacted with the connecting column and the temperature sensor.

Preferably, the second through hole is stepped.

The beneficial effects of the utility model are as follows:

1. the utility model can monitor the wall thickness of the oil and gas pipeline in real time, and after the oil and gas pipeline is installed on the surface of the pipeline, the measured data can be transmitted to a remote server without the participation of field personnel, and detection personnel can check the detected data at any place with network connection and timely take maintenance measures to improve the safety of the pipeline.

2. The design of the ultrasonic on-line monitoring device conforms to the explosion-proof requirement and meets the deployment requirement of the oil-gas station instrument.

3. The ultrasonic on-line monitoring device is of a single-body design, is free of an outer lead cable, is convenient to install and detach, and avoids the on-site wiring from affecting the maintenance of the shale gas transmission pipeline. The two-cavity design of the shell separates the PCB from the explosion-proof battery, so that the early test and the later maintenance are facilitated.

4. And the temperature compensation of the pipeline wall thickness data is carried out based on the temperature sensor, so that the detection precision is greatly improved. The floating compaction design based on the spring can enable the temperature sensor to be self-adaptive to the height change of the surface of the pipeline to be tested.

5. The ultrasonic on-line monitoring device uses a silica gel material as a dry coupling agent, is easy to deform, can achieve a good coupling effect only by small pretightening force, and cannot damage a pipeline. The weather resistance is good, the ageing is difficult, the long-term stability is achieved, and the requirement of long-term real-time monitoring of the wall thickness of the pipeline is met.

6. The ultrasonic on-line monitoring device has the advantages of simple manufacturing process, low manufacturing cost, simple structure, ingenious design and reasonable layout, is particularly suitable for popularization and application in the field, and has very broad market prospect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present utility model and are not limiting of the present utility model.

FIG. 1 is a schematic diagram of the overall structure of an ultrasonic on-line monitoring device;

FIG. 2 is a schematic view of the internal structure of the explosion-proof chamber and the housing;

FIG. 3 is a schematic diagram of a sensor installation;

fig. 4 is a schematic view of a fixing mechanism.

In the figure:

1. an explosion-proof cavity; 1-1, a shell; 1-2, a first stuffing box; 1-3, a second stuffing box; 1-4, a first cover plate; 1-5, a second cover plate;

2-1, a PCB board; 2-2, explosion-proof battery; 2-3, an antenna;

3. a sensor; 3-1, an ultrasonic probe; 3-2, a temperature sensor;

4. a fixing mechanism; 4-1, connecting columns; 4-2, clamping hoop; 4-3, a base; 4-4, spring

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the terms "comprising" or "includes" and the like in this disclosure is intended to cover an element or article listed after that term and equivalents thereof without precluding other elements or articles. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

The utility model will be further described with reference to the drawings and examples.

As shown in fig. 1 to 4, a temperature compensated, single body type ultrasonic on-line monitoring device includes: an explosion-proof cavity 1, wherein the explosion-proof cavity 1 further comprises a shell 1-1; the lower end of the shell 1-1 is provided with a second stuffing box 1-3; the left end of the shell 1-1 is provided with a first cover plate 1-4; the right end of the shell 1-1 is provided with a second cover plate 1-5.

The explosion-proof cavity 1 is internally provided with a two-cavity design, and a PCB 2-1 and an explosion-proof battery 2-2 which are used for controlling the operation of the whole device are arranged; the PCB 2-1 is connected with the explosion-proof battery 2-2; the upper end of the explosion-proof cavity 1 is provided with a first stuffing box 1-2, and the stuffing box 1-2 is an explosion-proof waterproof armoured stuffing box; an antenna 2-3 for signal transmission is arranged in the first stuffing box 1-2, and the antenna 2-3 is a glue stick antenna with the frequency of 433 MHz; the antenna 2-3 is connected with the PCB 2-1 signal transmitting module, and after the wall thickness information and the temperature information of the pipeline are obtained through measurement, data are transmitted to a remote cloud server in a wireless transmission mode through the antenna; the lower end of the explosion-proof cavity 1 is fixed on a pipeline through a fixing mechanism 4; the device also comprises a sensor 3 for measuring the wall thickness and the temperature of the pipeline and a display device for receiving the signal transmitted by the antenna, wherein the sensor 3 comprises an ultrasonic probe 3-1 and a temperature sensor 3-2; the ultrasonic probe 3-1 is a piezoelectric ultrasonic single crystal straight probe, and is used for measuring wall thickness information of a pipeline by exciting and receiving ultrasonic waves through a piezoelectric effect and an inverse piezoelectric effect.

The fixing mechanism comprises a connecting column 4-1, a clamp 4-2 and a base 4-3, wherein the outer ring of the connecting column 4-1 is of a hexagonal structure, the upper end of the connecting column is provided with a large-diameter round hole for placing a stuffing box 1-3, the lower end of the connecting column is provided with a central hole and an offset hole for threading a sensor signal wire, and the stuffing box 1-3 is an explosion-proof waterproof armoured stuffing box; the lower end of the connecting column 4-1 is connected with the base 4-3; the base 4-3 is fixed on the pipeline through the clamp 4-2; the clamp 4-2 is of an annular structure, two studs are welded above the clamp, and the upper and lower rings wrap the pipeline and are fixed by bolts at two sides; the base 4-3 is provided with a central stepped hole; the ultrasonic probe 3-1 is fixed below the base 4-3 through a central stepped hole; the base 4-3 is provided with an offset stepped hole; a spring 4-4 is arranged above the inner part of the offset stepped hole; the upper end and the lower end of the spring 4-4 are respectively contacted with the connecting column 4-1 and the temperature sensor 3-2, and the spring 4-4 provides downward pretightening force for the temperature sensor 3-2.

The use mode and the function of the temperature-compensated single ultrasonic on-line monitoring device are as follows:

after the device is assembled, the device is fixed at the position of a pipeline to be measured point, a silica gel material is added between the ultrasonic probe 3-1 and the pipeline to serve as a coupling agent, and the coupling is performed by using smaller pressure. The monitoring device can automatically measure the thickness information and the temperature information of the pipeline once at regular intervals, and transmits the thickness information and the temperature information to a remote server through the antenna 2-3, and a detector can use a computer to access the server to check the thickness information, the temperature information and the long-term change curve. When calculating the thickness information of the pipeline, a temperature compensation mechanism is introduced, the temperature of the pipeline can be measured according to a temperature sensor, after the thickness measurement information and the temperature information are acquired at a server side, a formula is utilized according to the current temperature valueThe sound velocity of the ultrasonic wave in the pipe is compensated. Wherein V is _T The sound velocity of ultrasonic wave in the pipeline at the current temperature is T, T is the current temperature, V ₃₀ Is the sound velocity of ultrasonic wave in the pipeline at the normal temperature of 30 ℃. After the sound velocity compensation, the formula +.>And calculating the thickness value of the pipeline after temperature compensation. Where d is the thickness of the pipe, v is the speed of sound of the ultrasonic wave in the pipe, and t is the time taken for the ultrasonic wave to travel back and forth in the pipe once. Under the working condition of temperature change of the pipeline, the wall thickness measuring precision of the pipeline can reach 0.1mm through a temperature compensation mechanism, and the measuring precision is greatly improved. Each time the monitoring device measuresAccording to the command, the method is automatically completed, interference of human factors is reduced, and efficiency and stability are improved.

The present utility model is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the utility model.

Claims

1. A temperature compensated, unitary ultrasonic on-line monitoring device, comprising: the explosion-proof device comprises an explosion-proof cavity (1), wherein a PCB (2-1) and an explosion-proof battery (2-2) for controlling the operation of the whole device are arranged in the explosion-proof cavity (1); the PCB (2-1) is connected with the explosion-proof battery (2-2); the upper end of the explosion-proof cavity (1) is provided with a first stuffing box (1-2); an antenna (2-3) for signal transmission is arranged inside the first stuffing box (1-2); the antenna (2-3) is connected with the PCB (2-1); the lower end of the explosion-proof cavity (1) is fixed on a pipeline through a fixing mechanism (4);

the device also comprises a sensor (3) for measuring the wall thickness and the temperature of the pipeline and a display device for receiving the signal transmitted by the antenna.

2. The temperature-compensated, single-body ultrasonic on-line monitoring device of claim 1, wherein the explosion-proof chamber (1) further comprises a housing (1-1); the lower end of the shell (1-1) is provided with a second stuffing box (1-3); the left end of the shell (1-1) is provided with a first cover plate (1-4); the right end of the shell (1-1) is provided with a second cover plate (1-5).

3. The temperature-compensated, unitary, ultrasonic on-line monitoring device of claim 1, wherein said sensor (3) comprises an ultrasonic probe (3-1) and a temperature sensor (3-2).

4. A temperature-compensated, unitary, ultrasonic on-line monitoring device as claimed in claim 3, wherein said ultrasonic probe (3-1) is a piezoelectric, ultrasonic, single crystal, straight probe.

5. The temperature-compensated single-body type ultrasonic on-line monitoring device according to claim 1, wherein the fixing mechanism comprises a connecting column (4-1), a clamp (4-2) and a base (4-3), and the lower end of the connecting column (4-1) is connected with the base (4-3); the base (4-3) is fixed on the pipeline through the clamp (4-2).

6. The temperature-compensated single-body ultrasonic on-line monitoring device according to claim 5, wherein a second stuffing box (1-3) is arranged inside the connecting column (4-1).

7. The temperature-compensated, unitary, ultrasonic on-line monitoring device of claim 5, wherein said base (4-3) is provided with a first through-hole; the ultrasonic probe (3-1) is fixed below the base (4-3) through the first through hole.

8. The temperature-compensated, unitary, ultrasonic on-line monitoring device of claim 7 wherein said first through-hole is stepped.

9. The temperature-compensated, unitary, ultrasonic on-line monitoring device of claim 5, wherein said base (4-3) is provided with a second through-hole; a spring (4-4) is arranged above the inner part of the second through hole; the upper end and the lower end of the spring (4-4) are respectively contacted with the connecting column (4-1) and the temperature sensor (3-2).

10. The temperature-compensated, unitary, ultrasonic on-line monitoring device of claim 9 wherein said second through-hole is stepped.