CN111829735A - Device and method for detecting air tightness of pipeline - Google Patents

Device and method for detecting air tightness of pipeline Download PDF

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Publication number
CN111829735A
CN111829735A CN202010758286.5A CN202010758286A CN111829735A CN 111829735 A CN111829735 A CN 111829735A CN 202010758286 A CN202010758286 A CN 202010758286A CN 111829735 A CN111829735 A CN 111829735A
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CN
China
Prior art keywords
pipeline
adsorption
vacuum degree
test chamber
sucker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010758286.5A
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Chinese (zh)
Inventor
王立华
易小兵
张君禄
李兆恒
万家瑞
张健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Research Institute of Water Resources and Hydropower
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Guangdong Research Institute of Water Resources and Hydropower
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Research Institute of Water Resources and Hydropower filed Critical Guangdong Research Institute of Water Resources and Hydropower
Priority to CN202010758286.5A priority Critical patent/CN111829735A/en
Publication of CN111829735A publication Critical patent/CN111829735A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
    • G01M3/2815Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2884Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for welds

Abstract

The invention discloses a device and a method for detecting the air tightness of a pipeline, wherein the device for detecting the air tightness of the pipeline comprises an adsorption type test cabin, a vacuum pump and a vacuum degree detection device, wherein the adsorption type test cabin comprises an adsorption device and a sealing cover, and the adsorption device is arranged at an opening of the sealing cover; the vacuum pump is communicated with the sealing cover through a first pipeline, and a first valve is arranged on the first pipeline; the vacuum degree detection device is communicated with the first pipeline. The method for detecting the air tightness of the pipeline comprises the steps of firstly adsorbing an adsorption test chamber in a pipeline welding line area to be detected, enabling the adsorption test chamber to seal the pipeline welding line area to be detected, successively opening a first valve and a vacuum pump, vacuumizing the adsorption test chamber to a test value, closing the first valve and the vacuum pump, reading relevant readings of a vacuum degree detection device, and if the readings of the vacuum degree detection device are not changed to be lower than a qualified vacuum value within a certain time, meeting requirements, otherwise, not meeting the requirements.

Description

Device and method for detecting air tightness of pipeline
Technical Field
The invention is used in the field of air tightness detection, and particularly relates to a device and a method for detecting air tightness of a pipeline.
Background
The water pressure in the pressure water pipeline buried underground deeply can reach 200m water column or even higher, the water in the pipeline can leak through the welding seam pinhole under high pressure, when the pressure water pipeline is in the intact basement rock of the deep underground layer, the leaked water leaks through the welding seam pinhole for a long time and is accumulated in a small gap between the pipeline and the rock to form high-pressure water outside the pipeline, when the pipeline supplies water, the water pressure inside and outside the pipeline is equal, but due to reasons such as maintenance and the like, when the water delivery is stopped suddenly inside the pipeline, the water pressure in the pipeline disappears, but the high pressure outside the pipeline still exists, the pipeline is easily pressed by huge pressure outside the pipeline to be askew and deformed, and the pressure outside the pipeline is uneven, and the damage to the pipeline is.
In order to check whether the sealing performance of the welding line of the pipeline meets the requirement on site, the traditional checking method is to carry out a water closing test of the whole section of pipeline, namely, two ends of the whole section of pipeline are plugged, water is injected and pressurized outside an end head, the change range of the water pressure along with time is checked to determine whether the sealing performance meets the requirement, but for the pipeline deeply buried underground, the plugging, the water injection and pressurization and the drainage of the pipeline are very difficult, and a small amount of slow water leakage is difficult to find due to too large water amount in the pipeline, so the traditional method is not suitable for the sealing performance check of the pipeline deeply buried underground.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art and provides a device and a method for detecting the air tightness of a pipeline, wherein the device and the method have the advantages of higher efficiency, lower cost and reliable detection result in the detection process.
The technical scheme adopted by the invention for solving the technical problems is as follows: an air tightness detection device for a pipeline comprises
The adsorption type test cabin is used for adsorbing a welding seam of a pipeline to be tested and comprises an adsorption device and a sealing cover, wherein the adsorption device is arranged at an opening of the sealing cover;
the vacuum pump is communicated with the sealing cover through a first pipeline, and a first valve is arranged on the first pipeline;
and the vacuum degree detection device is communicated with the first pipeline to detect the vacuum degree in the adsorption type test cabin.
Preferably, the adsorption device comprises a first sucker and a second sucker, the first sucker is located in the second sucker and is spaced from the second sucker, an adsorption cavity is defined by the first sucker and the second sucker at intervals, the adsorption cavity is connected with the vacuum pump through a second pipeline, and a second valve is arranged on the second pipeline.
Preferably, rectangular grid suction lips are arranged on the first suction cup and the second suction cup.
Preferably, a support frame for supporting the sealing cover is arranged in the sealing cover.
Preferably, the first sucker and the second sucker are both provided with magnetic powder.
Preferably, the vacuum degree detection device comprises a U-shaped pipe, an air chamber and an air valve, one end of the U-shaped pipe is communicated with the first pipeline, the other end of the U-shaped pipe is communicated with the air chamber, and the air valve for opening and closing the air chamber is arranged on one side of the air chamber.
A method for detecting the air tightness of a pipeline comprises the following steps:
adsorbing the adsorption test chamber in a pipeline welding seam area to be detected;
starting a vacuum pump, and vacuumizing the adsorption type test chamber to a test value;
closing the vacuum system;
and judging the air tightness of the pipeline welding seam to be detected by observing the corresponding reading of the vacuum degree detection device.
Preferably, the adsorption test chamber is used for treating the welding seam area of the pipeline to be detected until the roughness reaches Ra3.2 level before the adsorption test chamber is adsorbed in the welding seam area of the pipeline to be detected.
Preferably, when the corresponding reading of the vacuum degree detection device is observed, if the vacuum degree in the adsorption type test chamber is not lower than a qualified vacuum degree value within 20-60 minutes, the air tightness of the welding seam area of the pipeline to be detected meets the requirement.
Preferably, before the pipeline is detected, the adsorption type test chamber is adsorbed on a steel plate with surface roughness Ra3.2 grade, size not smaller than the test chamber and thickness not smaller than 5mm to perform adsorption test, the initial vacuum degree in the adsorption type test chamber is P0, the vacuum degree value in the adsorption type test chamber is P1 within 20-60 minutes, and (P0-kxP 1) is taken as a qualified vacuum degree value, wherein k is 1-5, and the k value is determined according to the roughness of the surface of the pipeline to be detected and the test condition.
One of the above technical solutions has at least one of the following advantages or beneficial effects: in the detection process, firstly, the adsorption test chamber is adsorbed on the pipeline welding seam area to be detected, so that the adsorption test chamber seals the pipeline welding seam area to be detected, the first valve and the vacuum pump are sequentially opened, the adsorption test chamber is vacuumized to a test value, the first valve and the vacuum pump are closed, the relevant reading of the vacuum degree detection device is read, if the reading of the vacuum degree detection device is not changed to be lower than a qualified vacuum value within a certain time, the air tightness of the pipeline welding seam meets the requirement, otherwise, the air tightness requirement is not met.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the adsorption apparatus in the embodiment shown in FIG. 1;
FIG. 3 is a schematic view showing the structure of the vacuum detecting apparatus in the embodiment shown in FIG. 1.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.
In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
Referring to fig. 1 and 2, the present invention is mainly used for detecting the air tightness of the pipeline, and the following description will be made in detail with respect to detecting the air tightness of the pipeline weld as an example.
The gas tightness detection device of pipeline includes absorption formula proof chamber 2, vacuum pump 3 and vacuum detection device 4, absorption formula proof chamber 2 includes the sealed cowling and establishes the adsorption equipment at the sealed cowling opening part, adsorption equipment is used for adsorbing absorption formula proof chamber 2 and treats the welding seam region of treating pipeline 1, treat that the welding seam region of treating pipeline 1 prescribes a limit to sealed space, be equipped with support frame 221 in the sealed cowling, be used for supporting the sealed cowling, wherein support frame 221 adopts thickness to be 8mm, the width is made for 25 mm's band steel, steel is carbon construction steel or stainless steel, and the sealed cowling can bear the inside vacuum pressure of being no less than-400 kPa, the sealed cowling can be established to the structure of square, circular, oval or other shapes. First connection port 222 has been seted up on the sealed cowling, and vacuum pump 3 connects on the first connection port 222 of sealed cowling through first pipeline 5, is equipped with the first valve 51 that is used for switching first pipeline 5 on the first pipeline 5, and vacuum detection device 4 communicates with first pipeline 5 for detect the vacuum in the absorption formula test chamber, and vacuum detection device 4's detection precision should be not less than 0.1 kPa.
In the detection process, firstly, the adsorption type test chamber 2 is adsorbed in the welding seam area of the pipeline 1 to be detected, so that the adsorption type test chamber 2 limits an isolated external cavity in the welding seam area of the pipeline 1 to be detected, the first valve 51 and the vacuum pump 3 are successively opened, the adsorption type test chamber 2 is vacuumized to a test value, then the first valve 51 and the vacuum pump 3 are closed, relevant readings of the vacuum degree detection device 4 are read, if the relevant readings of the vacuum degree detection device 4 are not changed to be lower than a qualified vacuum value within a certain time, the air tightness of the welding seam of the pipeline 1 meets the requirement, otherwise, the air tightness requirement is not met, and the specific standard requirement of the air tightness is met.
In an embodiment of the present invention, the adsorption test chamber 2 may be adsorbed on the pipeline 1 by means of adhesion, pressing, vacuum pumping, and the like, and referring to fig. 2, the adsorption device includes a first suction cup 211 and a second suction cup 212, the first suction cup 211 is smaller than the second suction cup 212, the first suction cup 211 is located in the second suction cup 212 and concentrically arranged with the second suction cup 212, the first suction cup 211 and the second suction cup 212 are spaced from each other, an adsorption cavity 23 is defined in the space between the first suction cup 211 and the second suction cup 212, a second connection port 231 is formed on the adsorption cavity 23, the second connection port 231 is connected with the vacuum pump 3 through a second pipeline 6, and a second valve 61 is disposed on the second pipeline 6. Of course, the suction cup can be in a circular structure or other polygonal structures besides the rectangular suction cup.
Referring to fig. 2, in some embodiments, a plurality of rectangular cellular suction lips 24 are arranged on each of the first suction cup 211 and the second suction cup 212 at intervals, wherein the suction force of the rectangular cellular suction lips 24 reaches 5kPa, and the suction lips can be adsorbed on the pipeline 1 after being wetted with water, so that the adsorption force and the sealing property of the adsorption test chamber 2 and the pipeline 1 are improved.
In some embodiments, magnetic powder is disposed in each of the first suction cup 211 and the second suction cup 212, and the connection strength between the adsorption test chamber 2 and the pipeline 1 can be enhanced by the magnetic force of the magnetic powder.
In the detection process, firstly, the rectangular grid suction lip 24 is moistened by water, then the first suction disc 211 and the second suction disc 212 are attached to the welding seam area of the pipeline 1 to be detected, the first valve 51 is closed, the second valve 61 and the vacuum pump 3 are opened, the adsorption cavity 23 is vacuumized through the vacuum pump 3, so that the adsorption test chamber 2 is in the welding seam area of the pipeline 1 to be detected through atmospheric pressure, it is ensured that the adsorption test chamber 2 defines an isolated external sealed chamber in the welding seam area of the pipeline 1 to be detected, then the second valve 61 is closed, the first valve 51 is opened, the adsorption test chamber 2 is vacuumized to a test value through the vacuum pump 3, relevant reading of the vacuum degree detection device 4 is observed to judge the air tightness, the air tightness detection device of the pipeline is higher in efficiency and lower in cost in the detection process, and the detection result is more reliable.
Referring to fig. 1 and 3, the vacuum degree detection device 4 comprises a U-shaped pipe 41, an air chamber 42 and an air valve 43, one end of the U-shaped pipe 41 is communicated with the first pipeline 5, the other end of the U-shaped pipe 41 is communicated with the air chamber 42, one side of the air chamber 42 is provided with an air valve 43 for opening and closing the air chamber 42, scales are arranged on the U-shaped pipe 41, liquid is filled in the U-shaped pipe 41, after the adsorption test chamber 2 is vacuumized, the change of the vacuum degree in the adsorption test chamber 2 can be visually seen through observing the change of the liquid level in the U-shaped pipe 41, of course, the vacuum degree detection device 4 can be directly set as a vacuum degree detection meter except for detecting the change value of the vacuum degree in the adsorption test chamber 2 through observing the change of the liquid level, and the change of the vacuum degree in the adsorption test chamber 2.
Referring to fig. 1 and fig. 3, an embodiment of the present invention further provides a method for detecting air tightness of a pipeline, which includes the following specific steps: cleaning a welding line area of a pipeline 1 to be detected, treating the surface of the pipeline to reach a roughness level Ra3.2, facilitating the adsorption of a rectangular grid suction lip 24, wetting the rectangular grid suction lip 24 with water, aligning an adsorption cavity 23 of an adsorption type test cabin 2 to the welding line area of the pipeline 1 to be detected to be tightly attached to the pipeline 1, closing a first valve 51, opening a second valve 61 and a vacuum pump 3, vacuumizing the adsorption cavity 23 to enable the adsorption type test cabin 2 to be adsorbed to the welding line area of the pipeline 1 to be detected, closing the second valve 61 to enable the adsorption cavity 23 to continuously keep vacuum, opening the first valve 51, vacuumizing a sealing cover to a test value through the vacuum pump 3, stabilizing the pressure for at least ten minutes after the adsorption type test cabin 2 is vacuumized to the test value, then closing the first valve 51 and the vacuum pump 3, and judging whether the air tightness of the welding line of the pipeline 1 to be detected meets requirements or not by observing the change of the liquid level in a U-shaped pipe 41, in the process of observing the change of the liquid level in the U-shaped pipe 41, if the vacuum degree in the adsorption test chamber 2 is not lower than a qualified vacuum degree value within 20-60 minutes, the air tightness of the welding line area of the pipeline 1 to be detected meets the requirement, otherwise, the air tightness does not meet the requirement, and a vacuum degree detection table can also be adopted as a vacuum degree detection device. The specific standard requirement of the air tightness is that the tested vacuum degree test value is not less than one sixth of the qualified value within 20-60 minutes. The detection method is simple in detection mode and reliable in conclusion, detection procedures can be greatly reduced, a large amount of manpower and material resources are saved, the test cost is reduced, and the field adaptability is stronger.
In addition, before the pipeline is detected, an adsorption test chamber is firstly adsorbed on a steel plate with the surface roughness of Ra3.2 grade, the size of the steel plate is not smaller than the test chamber, and the thickness of the steel plate is not smaller than 5mm to carry out adsorption test, the initial vacuum degree in the adsorption test chamber is P0, the vacuum degree value in the adsorption test chamber is P1 within 20-60 minutes, and (P0-kxP 1) is taken as a qualified vacuum degree value, wherein K is 1-5, the K value is determined according to the roughness of the surface of the pipeline to be detected and test conditions, for example, the roughness of the surface of a steel pipe is 0.8-1.6, K is 1, when the roughness of the steel pipe is 1.6-3.2, K is 3, and when the roughness of the steel pipe is more than 3.2, K is 5.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (10)

1. The utility model provides an air tightness detection device of pipeline which characterized in that: comprises that
The adsorption type test chamber is used for adsorbing a pipeline to be tested and comprises an adsorption device and a sealing cover, wherein the adsorption device is arranged at an opening of the sealing cover;
the vacuum pump is communicated with the sealing cover through a first pipeline, and a first valve is arranged on the first pipeline;
and the vacuum degree detection device is communicated with the first pipeline to detect the vacuum degree in the sealing cover.
2. The airtightness detection apparatus for a pipe according to claim 1, wherein: the adsorption device comprises a first sucker and a second sucker, the first sucker is located in the second sucker and is spaced from the second sucker, an adsorption cavity is defined at intervals of the first sucker and the second sucker, the adsorption cavity is connected with the vacuum pump through a second pipeline, and a second valve is arranged on the second pipeline.
3. The airtightness detection apparatus for a pipe according to claim 2, wherein: and rectangular grid suction lips are arranged on the first suction cup and the second suction cup.
4. The airtightness detection apparatus for a pipe according to claim 1, wherein: and a support frame for supporting the sealing cover is arranged in the sealing cover.
5. The airtightness detection apparatus for a pipe according to claim 2, wherein: and magnetic powder is arranged in the first sucker and the second sucker.
6. The airtightness detection apparatus for a pipe according to claim 1, wherein: the vacuum degree detection device comprises a U-shaped pipe, an air chamber and an air valve, one end of the U-shaped pipe is communicated with the first pipeline, the other end of the U-shaped pipe is communicated with the air chamber, and the air valve for opening and closing the air chamber is arranged on one side of the air chamber.
7. The method for detecting the air tightness of the pipeline is characterized by comprising the following steps of:
adsorbing the adsorption test chamber on a pipeline to be detected;
starting a vacuum pump, and vacuumizing the adsorption type test chamber to an initial vacuum value;
closing the vacuum system;
and judging the air tightness of the to-be-detected position of the pipeline by observing the corresponding reading of the vacuum degree detection device.
8. The method for detecting the airtightness of a pipe according to claim 7, wherein: before the adsorption type test chamber is adsorbed on the pipeline to be detected, the area to be detected of the pipeline is processed until the roughness reaches Ra3.2 level.
9. The method for detecting the airtightness of a pipe according to claim 7, wherein: and when the corresponding reading of the vacuum degree detection device is observed, if the vacuum degree in the adsorption type test chamber is not lower than the qualified vacuum degree value within 20-60 minutes, the air tightness of the welding seam area of the pipeline to be detected meets the requirement.
10. The method for detecting the airtightness of a pipe according to claim 9, wherein: before detecting the pipeline, the adsorption type test chamber is adsorbed on a steel plate with the surface roughness of Ra3.2 grade, the size of the adsorption type test chamber is not smaller than the test chamber, and the thickness of the steel plate is not smaller than 5mm to carry out adsorption test, the initial vacuum degree in the adsorption type test chamber is P0, the vacuum degree value in the adsorption type test chamber is P1 within 20-60 minutes, and (P0-kxP 1) is taken as a qualified vacuum degree value, wherein k is 1-5, and the k value is determined according to the roughness of the surface of the pipeline to be tested and test conditions.
CN202010758286.5A 2020-07-31 2020-07-31 Device and method for detecting air tightness of pipeline Pending CN111829735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010758286.5A CN111829735A (en) 2020-07-31 2020-07-31 Device and method for detecting air tightness of pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010758286.5A CN111829735A (en) 2020-07-31 2020-07-31 Device and method for detecting air tightness of pipeline

Publications (1)

Publication Number Publication Date
CN111829735A true CN111829735A (en) 2020-10-27

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Application Number Title Priority Date Filing Date
CN202010758286.5A Pending CN111829735A (en) 2020-07-31 2020-07-31 Device and method for detecting air tightness of pipeline

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113280896A (en) * 2021-06-22 2021-08-20 沈朋 Water meter sealing performance detection device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113280896A (en) * 2021-06-22 2021-08-20 沈朋 Water meter sealing performance detection device and method

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