CN111341521A - Coil structure for eliminating residual magnetism of ferromagnetic pipeline on line and application thereof - Google Patents
Coil structure for eliminating residual magnetism of ferromagnetic pipeline on line and application thereof Download PDFInfo
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- CN111341521A CN111341521A CN202010249910.9A CN202010249910A CN111341521A CN 111341521 A CN111341521 A CN 111341521A CN 202010249910 A CN202010249910 A CN 202010249910A CN 111341521 A CN111341521 A CN 111341521A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
Abstract
The invention provides a coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line, which comprises: the connecting rings are connected to the interfaces of two adjacent basic rings, and coils adaptive to different pipe diameters are formed by selecting the length of the connecting rings. The utility model also provides an application of above-mentioned coil structure in the demagnetization method, cover the foundation ring on the pipeline in advance, link into spiral coil through the go-between with the foundation ring, adopt the connecting ring of different length to twine the pipeline of different diameters, and then demagnetize the pipeline. The invention changes the coil which needs to be wound originally into a split form, thereby avoiding winding the coil on a long and heavy pipeline; the spiral coil can be wound and detached only by simple plugging; the basic ring and the connecting ring have the length adjusting function respectively, and one set of device can adapt to the detection of different pipe diameters; the base ring has set up the interface in different positions, can connect at different interfaces according to the pipe diameter size.
Description
Technical Field
The invention belongs to the technical field of pressure pipelines, and particularly relates to a coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line and application thereof.
Background
When the oil gas long-distance transmission pressure pipeline is produced, residual magnetism can be generated at two ends of the pipeline due to the influence of factors such as a parent metal and a steel pipe production process; according to the inspection standard requirements of the oil and gas transmission pressure pipeline, the newly-built long-distance transmission pipeline needs to carry out internal detection and external detection, and the pipelines are magnetized by various internal detection and external detection methods; the oil and gas transmission pressure pipeline needs to be subjected to various operations and monitoring during service, for example, a digital intelligent pipe cleaner adopted for pipeline cleaning is driven by a magnet, and the pipeline is magnetized in the pipe cleaning process; nondestructive tests such as magnetic flux leakage test, eddy current test, magnetic powder test and the like of the pipeline can all cause the magnetization of the pipeline, and a residual magnetic field is left on the pipe wall.
The residual magnetism of the oil gas transmission pressure pipeline not only influences the detection of the pipeline, but also easily generates a magnetic blow-out phenomenon in the butt annular welding construction operation of the steel pipes because the residual magnetism is mainly concentrated on the pipe ends, so that the electric arc is deviated relative to a welding line, and the welding quality of the whole pipeline is influenced. Residual magnetism of the oil and gas transmission pressure pipeline can affect the accuracy of certain detection methods. For example, in the X-ray detection process, the scanning direction of the electron beam is changed after imaging due to the existence of magnetic lines of force, so that image distortion is caused, the sensitivity is greatly reduced, a detection blind area is formed, the X-ray detection result is influenced, and even the omission of the defects of the steel pipe is caused. Residual magnetism of the oil and gas transmission pressure pipeline can aggravate the corrosion rate inside the pipeline, and the interaction of the residual magnetism and an external magnetic field can increase the welding defects of the pipeline.
In order to avoid the harm of the residual magnetism of the steel pipe, the oil and gas transmission pressure pipeline must perform effective demagnetization treatment on the residual magnetism of the pipeline.
Direct current demagnetization and alternating current demagnetization are two common demagnetization methods, and compared with other demagnetization methods, the direct current demagnetization method and the alternating current demagnetization method can use a welding machine as a power supply, so that the method is more convenient.
The direct current demagnetizing is to wind demagnetizing coils around two ends of the pipe orifice respectively in the same direction, the coils are connected to a direct current power supply, the current in the coils generates a direct current magnetic field with the opposite polarity to the original residual magnetism of the pipeline, so that the magnetic field intensity at the port of the pipeline is reduced, and the current in the coils is adjusted to minimize the magnetic field at the port. As shown in fig. 1.
Only one demagnetizing coil is used for AC demagnetization, and the winding method of the coil is the same as that of DC demagnetization. When the capacitor is charged, the 2 and 3 contacts of the switch K are switched on; when the capacitor discharges, the 1 and 3 contacts of the switch K are connected, the fully charged capacitor discharges through the coil, the capacitor C and the coil L form an LC oscillation circuit, and the capacitor discharges through the coil to generate damping oscillation. In the process of alternating-current demagnetization of the pipeline, because the length of the coil is limited, residual magnetism of the pipeline at the position of the coil can only be eliminated in each demagnetization, and the final demagnetization effect cannot be achieved in one demagnetization. In order to reduce the residual magnetism of the pipe orifice to a lower level, the coil must be moved, the pipelines in the range of 1.5-2 m on each side of the pipe orifice are demagnetized, and the residual magnetism of the pipe orifice can be reduced to the lower level. As shown in fig. 2.
Therefore, more direct current demagnetization and alternating current demagnetization methods are used, coils need to be wound on the pipeline, and particularly, the alternating current demagnetization method needs to frequently move the coils, so that much inconvenience is brought to construction. In the process of pipeline demagnetization, the area of a welding wire used by a winding coil is up to 50mm2The flexibility is poor, and great difficulty is brought to winding. Especially, alternating current demagnetization is local demagnetization, is limited by the length of a coil, can only eliminate the residual magnetism of a pipeline at the position of the coil every time, the coil needs to be moved for many times, and after the pipeline within a certain range is demagnetized, the residual magnetism of a pipe orifice can be reduced to a lower level, so that the coil needs to be wound for many times.
At present, no explanation or report of the similar technology of the invention is found, and similar data at home and abroad are not collected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line and application thereof.
The invention is realized by the following technical scheme.
According to one aspect of the invention, a coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line is characterized by comprising: the connecting rings are connected to the interfaces of two adjacent basic rings, and coils adaptive to different pipe diameters are formed by selecting the length of the connecting rings.
Preferably, two ends of each basic ring are respectively provided with an interface; or
The two ends of each basic ring are respectively provided with an interface, and the ring body of the basic ring is provided with one or more interfaces.
Preferably, the length of the connecting ring is selected according to the size of the pipe diameter to be adapted.
Preferably, the sectional areas of the base ring and the connecting ring are respectively 35-50 mm2The welding wire of (2).
According to another aspect of the present invention, there is provided a use of the coil structure described in any one of the above in a degaussing method, wherein the base ring is sleeved on the pipe in advance, the base ring is connected to form a spiral coil through a connecting ring, and the pipes with different diameters are wound by using the connecting rings with different lengths, so as to degausse the pipes.
Preferably, aiming at a direct current demagnetization method, the number of basic rings in required stages is sleeved on two sections of pipelines in need of demagnetization in one step and the basic rings are arranged according to required screw pitches; selecting a proper connecting ring according to the circumference of the pipeline and the length of the foundation ring to connect two adjacent foundation rings; the unconnected end of the basic ring and the unconnected end of the connecting ring are respectively connected to the positive electrode and the negative electrode of the direct-current power supply.
Preferably, the length of the connecting ring between two lengths of pipe is greater than the length of the connecting ring on each length of pipe.
Preferably, aiming at an alternating current demagnetizing method, the number of basic rings in required stages is sleeved on one section of pipeline in two sections of pipelines to be demagnetized at one time, and the basic rings are arranged according to required screw pitches; selecting a proper connecting ring according to the circumference of the pipeline and the length of the foundation ring to connect two adjacent foundation rings; the unconnected end of the base ring and the unconnected end of the connecting ring are respectively connected with two poles of an alternating current power supply.
Preferably, the base ring length should be no less than 1/2 of the conduit perimeter.
Preferably, the connecting ring is connected between the interfaces of the two adjacent base ring ends and/or the interfaces of the two adjacent base ring bodies.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the coil structure for eliminating residual magnetism of the ferromagnetic pipeline on line and the application thereof change the coil which needs to be wound originally into a split form, thereby avoiding winding the coil on the long and heavy pipeline;
2. the coil structure for eliminating residual magnetism of the ferromagnetic pipeline on line and the application thereof can realize the winding and the dismounting of the spiral coil only by some simple plugging;
3. according to the coil structure for eliminating residual magnetism of the ferromagnetic pipeline on line and the application thereof, the basic ring and the connecting ring respectively have the length adjusting function, and one set of device can adapt to detection of different pipe diameters;
4. the invention provides a coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line and application thereof.A basic ring is provided with interfaces at different positions and can be connected with different interfaces according to the pipe diameter.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of DC demagnetization principle in background art
FIG. 2 is a schematic diagram of the AC demagnetization principle in the background art
FIG. 3 is a schematic diagram of a winding manner of a coil structure for online residual magnetism elimination of a ferromagnetic pipeline in a DC demagnetization method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a winding manner of a coil structure for online eliminating residual magnetism of a ferromagnetic pipeline in an AC demagnetization method according to an embodiment of the present invention;
fig. 5 illustrates a winding between the base ring and the connection ring provided in an embodiment of the present invention.
Figure 6 shows an alternative winding between the base ring and the coupling ring provided in the embodiment of the present invention.
FIG. 7 is a schematic diagram of an interface on a base ring provided in an embodiment of the present invention;
in the drawing, 1 is a base ring, 2 is a connection ring, 101 is an interface provided at one end of the base ring, 102 is an interface provided at the other end of the base ring, 103 is an interface provided on the body of the base ring, and 104 is another interface provided on the body of the base ring.
Detailed Description
The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
The embodiment of the invention provides a coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line, which comprises: the connecting rings are connected to the interfaces of two adjacent basic rings, and coils adaptive to different pipe diameters are formed by selecting the length of the connecting rings.
Further, two ends of each basic ring are respectively provided with an interface.
Furthermore, one or more interfaces are arranged on the ring body of each basic ring.
Further, the length of the connecting ring is selected according to the size of the pipe diameter to be adapted.
Further, the sectional areas of the base ring and the connecting ring are 35-50 mm respectively2The welding wire of (2).
Based on the coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line provided by the embodiment of the invention, the embodiment of the invention also provides an application of the coil structure in a demagnetization method.
Further, aiming at a direct current demagnetization method, the number of basic rings in required stages is sleeved on two sections of pipelines in need of demagnetization in one step and the basic rings are arranged according to required screw pitches; selecting a proper connecting ring according to the circumference of the pipeline and the length of the foundation ring to connect two adjacent foundation rings; the unconnected end of the basic ring and the unconnected end of the connecting ring are respectively connected to the positive electrode and the negative electrode of the direct-current power supply.
Based on the coil winding structure, the direct current degaussing method comprises the following steps: and switching on a power supply to generate a magnetic field with the direction opposite to the original magnetic field of the pipeline so as to demagnetize, synchronously measuring the remanence of the pipeline in the demagnetizing process, and switching off a circuit after the remanence of the pipeline is lower than that required by the welding standard so as to finish the demagnetizing.
Further, the base ring length should not be less than 1/2 of the conduit perimeter.
Further, the length of the connecting ring between two sections of pipe may be greater than the length of the connecting ring on each section of pipe.
Further, the connecting ring is connected between the interfaces at the ends of two adjacent basic rings and/or the interfaces on the ring bodies of two adjacent basic rings.
Further, aiming at an alternating current demagnetizing method, the number of basic rings in required stages is sleeved on one section of pipeline in two sections of pipelines to be demagnetized at one time, and the basic rings are arranged according to required screw pitches; selecting a proper connecting ring according to the circumference of the pipeline and the length of the foundation ring to connect two adjacent foundation rings; the unconnected end of the base ring and the unconnected end of the connecting ring are respectively connected with two poles of an alternating current power supply.
Based on the coil winding structure, the alternating current demagnetization method comprises the following steps: switching on an alternating current power supply to perform demagnetization, synchronously measuring the remanence of the pipeline in the demagnetization process, gradually reducing the current within a set time (for example, 1 minute) until the current reaches a zero value after the remanence of the pipeline is lower than the remanence required by a welding standard, and then switching off the power supply; moving coils in a set range (for example, 1.5-2 m) at two sides of the pipe orifice of the two sections of pipes respectively, and carrying out demagnetization treatment until the magnetic field in the range meets the welding requirement.
Further, the base ring length should not be less than 1/2 of the conduit perimeter.
Further, the connecting ring is connected between the interfaces at the ends of two adjacent basic rings and/or the interfaces on the ring bodies of two adjacent basic rings.
The technical solutions provided by the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
As shown in FIGS. 3 to 7, the coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line provided by the embodiment of the invention adopts a sectional area of 35-50 mm2The welding lead is used for manufacturing a base ring and a connecting ring, and the demagnetization of pipelines with various diameters is realized by adopting a common regulating mechanism of the base ring and the connecting ring. As shown in fig. 7, different interfaces are provided on the foundation ring; as shown in fig. 5 and 6, the connecting rings are inserted into different interfaces to form a coil structure capable of adapting to different pipe diameters. The connecting ring can adopt wires with different lengths.
As shown in fig. 3, the dc demagnetizing is to wind demagnetizing coils around the two ends of the pipe orifice respectively in the same direction, the coils are connected to a dc power supply, the current in the coils generates a dc magnetic field with the opposite polarity to the original remanence of the pipe, so as to reduce the magnetic field strength at the pipe port, and adjust the current in the coils to minimize the magnetic field at the port. The implementation process is as shown in the following figure, prying up the end parts of two sections of pipelines to be demagnetized respectively, sleeving coils of required stages at one time, arranging the coils according to required screw pitches, flatting the pipelines, selecting a proper connecting ring according to the circumference of the pipeline and the length of the basic ring, and in principle, the length of the basic ring is not less than 1/2 of the circumference of the pipeline. One end of the connecting ring is connected with a connector 101 arranged at one end part of the basic ring, the other end of the connecting ring is connected with a connector 102 arranged at the other end part of the basic ring, and the connecting ring is connected into a spiral coil in a mode shown in the drawing. And the unconnected end part of the basic ring and the unconnected end part of the connecting ring are respectively connected to the positive pole and the negative pole of a direct current power supply, and the power supply is switched on to generate a magnetic field with the direction opposite to the original magnetic field direction of the pipeline, so that demagnetization is performed. And (4) synchronously measuring the residual magnetism of the pipeline in the demagnetization process, and after the residual magnetism of the pipeline is lower than that required by the welding standard, disconnecting the circuit and finishing demagnetization.
As shown in fig. 4, only one demagnetizing coil is used for ac demagnetization, and the winding method of the coil is the same as that of dc demagnetization. In the process of alternating-current demagnetization of the pipeline, because the length of the coil is limited, only the remanence of the pipeline at the position of the coil can be eliminated in each demagnetization, and the final demagnetization effect cannot be achieved by one demagnetization. In order to reduce the residual magnetism of the pipe orifice to a lower level, the coil must be moved, the pipelines in the range of 1.5-2 m on each side of the pipe orifice are demagnetized, and the residual magnetism of the pipe orifice can be reduced to the lower level. As shown in fig. 4, prying one end of the pipeline, sleeving all coils at one time, arranging the coils according to a certain pitch, laying the pipeline flat, and selecting a proper connecting ring according to the circumference of the pipeline and the length of the basic ring, wherein the length of the basic ring is not less than 1/2 of the circumference of the pipeline in principle. One end of the connection ring is connected to a port 101 provided at one end of the base ring, and the other end of the connection ring is connected to a port 102 provided at the other end of the base ring, and is connected to a spiral coil in the manner shown in fig. 4. And respectively connecting the unconnected end part of the basic ring and the unconnected end part of the connecting ring to two poles of an alternating current power supply, and switching on the alternating current power supply to demagnetize. And (3) synchronously measuring the residual magnetism of the pipeline in the demagnetizing process, gradually reducing the current within 1 minute until the current reaches a zero value after the residual magnetism of the pipeline is lower than the residual magnetism required by the welding standard, and then cutting off the power supply. Moving the coils within the range of 1.5-2 m on each of two sides of the pipe orifice, and carrying out demagnetization treatment until the magnetic field within the range meets the welding requirement.
If the pipe diameter is further reduced, the connecting ring can be connected into one interface 103 arranged on the base ring body or the other interface 104 arranged on the base ring body to further adapt to the pipe diameter when the adjustment by changing the length of the connecting ring is unavailable.
The coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line and the application thereof provided by the embodiment of the invention comprise a base ring and a connecting ring, wherein the base ring is sleeved on the pipeline in advance, the base ring is connected into a spiral coil through the connecting ring, the connecting rings with different lengths are adopted to wind the pipelines with different diameters, the base ring is provided with different interfaces, the pipe diameter change can be further adapted, when the pipe diameter is reduced and cannot be adjusted through the connecting ring, the connecting ring can be connected with the different interfaces of the base ring to further adapt to the pipe diameter change, and the connection form of the base ring and the connecting ring can use various interfaces. According to the embodiment of the invention, the coil which needs to be wound originally is changed into a split form, so that the coil is prevented from being wound on a long and heavy pipeline; the spiral coil can be wound and detached only by simple plugging; the basic ring and the connecting ring have the length adjusting function respectively, and one set of device can adapt to the detection of different pipe diameters; the base ring has set up the interface in different positions, can connect at different interfaces according to the pipe diameter size.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line is characterized by comprising: the connecting rings are connected to the interfaces of two adjacent basic rings, and coils adaptive to different pipe diameters are formed by selecting the length of the connecting rings.
2. The coil structure for eliminating residual magnetism of a ferromagnetic pipeline in an online manner according to claim 1, wherein two ends of each basic ring are respectively provided with an interface; or
The two ends of each basic ring are respectively provided with an interface, and the ring body of the basic ring is provided with one or more interfaces.
3. The coil structure for eliminating residual magnetism of ferromagnetic pipeline in on-line as claimed in claim 1, wherein the length of said connecting ring is selected according to the pipe diameter to be adapted.
4. The coil structure for eliminating residual magnetism of a ferromagnetic pipeline on line according to any one of claims 1 to 3, wherein the base ring and the connecting ring respectively have sectional areas of 35-50 mm2The welding wire of (2).
5. Use of a coil construction according to one of the claims 1 to 4 in a method of degaussing a pipe, characterized in that the base ring is placed around the pipe beforehand, that the base ring is connected to form a spiral coil by means of connecting rings, that pipes of different diameters are wound with connecting rings of different lengths, and that the pipes are degaussed.
6. The application of the coil structure in the degaussing method is characterized in that for the direct-current degaussing method, the number of basic rings in required stages is sleeved on two sections of pipelines in need of degaussing in one step and the basic rings are arranged according to required screw pitches; selecting a proper connecting ring according to the circumference of the pipeline and the length of the foundation ring to connect two adjacent foundation rings; the unconnected end of the basic ring and the unconnected end of the connecting ring are respectively connected to the positive electrode and the negative electrode of the direct-current power supply.
7. The method of claim 6, wherein the length of the connection ring between two sections of pipe is greater than the length of the connection ring on each section of pipe.
8. The application of the coil structure in a degaussing method according to claim 5, characterized in that, for the alternating current degaussing method, the number of basic rings of required stages is sleeved on one section of the two sections of pipelines to be degaussed in one step and arranged according to the required screw pitch; selecting a proper connecting ring according to the circumference of the pipeline and the length of the foundation ring to connect two adjacent foundation rings; the unconnected end of the base ring and the unconnected end of the connecting ring are respectively connected with two poles of an alternating current power supply.
9. Use of a coil structure according to claim 6 or 8 in a degaussing method, characterized in that the basic loop length must not be less than 1/2 of the circumference of the pipe.
10. Use of a coil structure according to claim 6 or 8 in a degaussing method, characterized in that the connection ring is connected between the interfaces of two adjacent base ring ends and/or the interfaces on two adjacent base ring bodies.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249910.9A CN111341521A (en) | 2020-04-01 | 2020-04-01 | Coil structure for eliminating residual magnetism of ferromagnetic pipeline on line and application thereof |
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| CN202010249910.9A CN111341521A (en) | 2020-04-01 | 2020-04-01 | Coil structure for eliminating residual magnetism of ferromagnetic pipeline on line and application thereof |
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| CN210091851U (en) * | 2019-08-08 | 2020-02-18 | 迪尔集团有限公司 | Be used for electricity to build engineering area magnetic pipeline coil winding demagnetization device |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070057753A1 (en) * | 2005-09-14 | 2007-03-15 | Kuo Shu F | Apparatus and method for modifying properties of a substance |
| CN101471173A (en) * | 2007-12-28 | 2009-07-01 | 台达电子工业股份有限公司 | Combined inductor |
| CN202344113U (en) * | 2011-11-17 | 2012-07-25 | 山东华源锅炉有限公司 | Device for local demagnetization |
| CN208335950U (en) * | 2018-05-23 | 2019-01-04 | 长兴星东电子有限公司 | A kind of spliced combination inductor |
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