CN112161752B - Phase type detection device and detection method for leakage of double-layer storage tank - Google Patents
Phase type detection device and detection method for leakage of double-layer storage tank Download PDFInfo
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- CN112161752B CN112161752B CN202010914742.0A CN202010914742A CN112161752B CN 112161752 B CN112161752 B CN 112161752B CN 202010914742 A CN202010914742 A CN 202010914742A CN 112161752 B CN112161752 B CN 112161752B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/186—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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Abstract
The invention discloses a phase type detection device and a detection method for leakage of a double-layer storage tank, wherein the detection device comprises a flexible detection belt spirally wound on the outer wall of the storage tank, the flexible detection belt comprises a liquid absorption expansion rubber belt with a convex part on one surface and a common rubber belt with a groove on one surface, the liquid absorption expansion rubber belt and the common rubber belt are connected together in a matching way, the convex part of the liquid absorption expansion rubber belt is positioned in the groove of the common rubber belt, a first conductive base belt is arranged at the bottom of the groove of the common rubber belt, a second conductive base belt is arranged on the convex part of the liquid absorption expansion rubber belt towards one surface of the first conductive base belt, a gap is formed between the first conductive base belt and the second conductive base belt, and the liquid absorption expansion rubber belt expands after absorbing liquid and enables the second conductive base belt part at the convex part to be in electrical contact with the corresponding position of the first conductive base belt. The invention realizes the rapid and accurate detection of the leakage position of the storage tank.
Description
Technical Field
The invention relates to the technical field of storage tank leakage detection, in particular to a phase type detection device and a detection method for leakage of a double-layer storage tank.
Background
The storage tank is a container for storing liquids such as oil products, is often applied to gas stations, and is also used for storing liquids such as urea solution. The typical safety storage tank is a double-layer storage tank which is a double-layer tank body structure made of steel and steel or steel and glass fiber reinforced plastic. The outer tank body of the double-layer storage tank is provided with a manhole seat and a leakage detection seat, a leakage detection pipeline is installed on the leakage detection seat, and a leakage detection element is installed on the leakage detection pipeline.
Typical detection methods for leakage of the double-layer storage tank in the prior art include the following methods:
firstly, set up level sensor in the storage tank, judge whether there is the leakage through the unusual change condition of liquid level.
And secondly, pumping the interlayer space between the inner storage tank and the outer storage tank of the double-layer storage tank into vacuum, and judging whether leakage exists by detecting whether the negative pressure in the interlayer space is damaged.
And thirdly, the liquid level sensor is arranged in an interlayer space between the inner-layer storage tank and the outer-layer storage tank at the bottom of the storage tank, when liquid leaks, the leaked liquid flows into the interlayer space at the lower part of the storage tank and is sensed by the liquid level sensor, and therefore the liquid leakage is detected.
However, the tank leakage detection method described above can only determine whether or not there is a leakage, but cannot determine the position where the leakage occurs.
Therefore, there is a need to find a new method for determining whether a leak exists and determining the location of the leak when the leak is detected through technical innovation.
Disclosure of Invention
In order to solve the above problems, the present invention provides a phase-type detection apparatus and a detection method for leakage of a double-layer storage tank, which aims to achieve rapid and accurate detection of a leakage position of the storage tank. The specific technical scheme is as follows:
the utility model provides a phase place formula detection device for double-deck storage tank leaks, includes that the liquid of spiral winding on the storage tank outer wall leaks the flexible detection area, the flexible detection area includes that its one side has imbibition expansion rubber area and a face area notched ordinary rubber area of bellying, the bellying arrange in the full length direction in imbibition expansion rubber area, the recess arrange in the full length direction in ordinary rubber area, imbibition expansion rubber area with ordinary rubber area is to linking together, just the bellying of imbibition expansion rubber area is located in the recess in ordinary rubber area, the recess tank bottom in ordinary rubber area is provided with first electrically conductive baseband, go towards on the bellying of imbibition expansion rubber area the one side of first electrically conductive baseband is provided with the electrically conductive baseband of second, first electrically conductive baseband with be provided with the clearance between the electrically conductive baseband of second, imbibition expansion rubber area back expansion makes the electrically conductive baseband part of bellying position with the corresponding position electrical contact of first electrically conductive baseband.
Preferably, the first conductive base band and the second conductive base band are conductive base bands in the form of coatings or electroplated layers, or conductive base bands glued on the plane of the rubber band.
Preferably, one of the first conductive base band and the second conductive base band is a low-resistance conductive base band functioning as a conductive line, and the other conductive base band is a high-resistance conductive base band functioning as a resistance.
The invention adopts the matching of the low-resistance conductive base band and the high-resistance conductive base band, which is beneficial to forming good ohmic contact between the low-resistance conductive base band and the high-resistance conductive base band when liquid leaks, thereby improving the measurement precision.
As one of the preferable schemes for connecting the imbibition expansion rubber belt and the common rubber belt, the imbibition expansion rubber belt and the common rubber belt are connected by gluing.
As a second preferable mode of the connection between the liquid-absorbing expanded rubber band and the ordinary rubber band in the present invention, the connection between the liquid-absorbing expanded rubber band and the ordinary rubber band is reinforced by using tapping screws.
The connection scheme between the two liquid absorption expansion rubber belts and the common rubber belt can be used simultaneously.
In the invention, the same ends of a first conductive base band and a second conductive base band in the flexible detection band are connected with a resistance detection module respectively, and the resistance detection module is connected with a detection control system; when the storage tank leaks, the bulge that is located liquid leakage department on the imbibition inflation rubber tape takes place the inflation after the imbibition for first electrically conductive baseband and the electrically conductive baseband electrical contact of second, resistance detection module will detect resistance value between first electrically conductive baseband and the electrically conductive baseband of second sends detection control system, and detection control system will detect resistance value between first electrically conductive baseband and the electrically conductive baseband of second converts to the resistance value of the electrically conductive baseband part of high resistance between starting to the resistance detection module from the leakage point, and converts the resistance value of the electrically conductive baseband part of high resistance between starting to the resistance detection module from the leakage point into the electrically conductive baseband length of one section high resistance between starting to the resistance detection module from the leakage point, again according to electrically conductive baseband length of one section high resistance, flexible detection area spiral winding's pitch and spiral winding's diameter on the storage tank convert to concrete leakage point position on the storage tank.
Wherein the specific leak location comprises an axial location and a circumferential phase angle location of the leak on the outer wall of the storage tank. The detection control system is provided with a display for displaying the position of the leakage point of the storage tank.
Preferably, the flexible detection belt is spirally wound on the outer wall of the inner storage tank in the double-layer storage tank.
When the flexible detection band is spirally wound on the outer wall of the inner storage tank in the double-layer storage tank, the flexible detection band is actually positioned between the interlayer spaces of the inner storage tank and the outer storage tank. Considering that the flexible detection belt can best play the temporary sealing effect to the leakage position of inlayer storage tank when emergency, can set up the thickness size of flexible detection belt just in time and in the double-deck storage tank intermediate layer storage tank with outer storage tank between the intermediate layer apart from looks adaptation, like this when the inlayer storage tank leaks, imbibition inflation rubber belt can directly plug up the position of leaking when the inflation in the thickness direction to play the temporary sealing effect, further improved the security when the storage tank leaks from this. By means of the arrangement, the reliability of electrical contact between the first conductive base band and the second conductive base band at the leakage position when liquid leaks can be improved. Certainly, in order to ensure that the whole interlayer space is communicated, a plurality of communicating grooves which are distributed at intervals and are vertical to the length direction of the common rubber belt can be arranged on the end face of the common rubber belt, which is close to one side of the outer layer storage tank.
Preferably, the flexible detection strip can be spirally wound on the outer wall of the outer storage tank in the double-layer storage tank.
A detection method of a phase type detection device for leakage of a double-layer storage tank is characterized by comprising the following steps:
(1) Spirally winding the flexible detection belt on the outer wall of the storage tank at a set pitch, and contacting and fixing the liquid absorption expansion rubber belt of the flexible detection belt with the outer wall of the storage tank;
(2) One end of the flexible detection belt is led out through a detection pipeline arranged on the storage tank and then is connected with the resistance detection module, and a signal wire of the resistance detection module is connected to the detection control system;
(3) When the storage tank leaks, liquid located at the leakage position of the storage tank is adsorbed by the imbibition expansion rubber belt, the imbibition expansion rubber belt protruding portion located at the leakage position on the imbibition expansion rubber belt expands to cause the first conductive base belt to be in electrical contact with the second conductive base belt, the resistance detection module detects that the resistance value between the first conductive base belt and the second conductive base belt changes, the resistance value is reduced to a certain value from infinity, the detected resistance value is sent to the detection control system, the detection control system calculates the length of a section of high-resistance conductive base belt between the resistance detection module and the leakage point according to the detected resistance value, and the length of the section of high-resistance conductive base belt, the spiral winding thread pitch of the flexible detection belt on the storage tank and the spiral winding diameter are deducted from the length of a non-spiral winding portion between the resistance detection module and the leakage point, and the converted into the position of the specific point on the storage tank.
Wherein, the outer wall of the storage tank can be the outer wall of the inner storage tank or the outer storage tank.
As a further improvement of the invention, the flexible detection strip is subjected to a calibration test after being installed on the storage tank, and the calibration test method comprises the following steps:
(1) Equally dividing points are arranged on a common rubber belt of the flexible detection belt at certain intervals, and the axial position and the circumferential position corresponding to each equally dividing point on the flexible detection belt spirally wound on the outer wall part of the storage tank relative to the storage tank are recorded;
(2) Manually pressing the positions of the equal dividing points on the common rubber belt one by one to simulate leakage of the positions of the equal dividing points, enabling the first conductive base band and the second conductive base band which are positioned at the positions of the equal dividing points to be in electrical contact, measuring the resistance value of each electrical contact by using a universal meter, and recording the resistance value;
(3) According to the discrete data of the resistance values corresponding to the positions of the equal dividing points measured by the universal meter, processing the discrete data by adopting a least square method to obtain the resistance values corresponding to any positions on the flexible detection belt, so that a relation curve of the resistance values and the leakage positions is formed; the relationship is used to determine the actual leak location in the event of a tank liquid leak.
Preferably, the relation curve is written into a detection control system, and when the liquid in the storage tank leaks, the detection control system automatically judges the liquid leakage position according to the relation curve.
In the invention, the detection control system can adopt an MCU detection control system.
The beneficial effects of the invention are:
first, according to the phase type detection apparatus and the detection method for leakage of a double-layer storage tank of the present invention, by providing a flexible detection band, a first conductive baseband and a second conductive baseband are electrically connected to each other at a leakage portion when a liquid leaks by using a liquid-absorbing expansion rubber band in the flexible detection band, so that a resistance value of the conductive baseband between the leakage portion and a resistance detection end can be measured. The resistance value is in direct proportion to the length of the conductive base band, so that the position of the leakage part on the conductive base band is known, and the leakage position on the storage tank is also known according to the size of the spiral winding structure of the flexible detection band on the storage tank, so that the quick and accurate detection of the leakage position of the storage tank is realized.
Secondly, according to the phase type detection device and the detection method for leakage of the double-layer storage tank, the precision of detection of the leakage position can be further improved by adopting a method of performing calibration test after flexible detection is installed on the storage tank.
Drawings
FIG. 1 is a schematic cross-sectional view of a flexible detection band of the present invention for use in a phase-type detection device for leakage from a two-layer tank.
In the figure: 1. ordinary rubber area, 2, imbibition expansion rubber area, 3, bellying, 4, first electrically conductive baseband, 5, second electrically conductive baseband, 6, self-tapping screw, 7, recess.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
fig. 1 shows an embodiment of a phase-type detection apparatus for leakage of a double-layer storage tank according to the present invention, which includes a flexible detection belt for liquid leakage spirally wound on an outer wall of the storage tank, wherein the flexible detection belt includes a liquid-absorbing expanded rubber belt 2 having a protrusion 3 on one surface thereof and a general rubber belt 1 having a groove 7 on one surface thereof, the protrusion 3 is disposed in a full length direction of the liquid-absorbing expanded rubber belt 2, the groove 7 is disposed in a full length direction of the general rubber belt 1, the liquid-absorbing expanded rubber belt 2 is connected to the general rubber belt 1 in an aligned manner, the protrusion 3 of the liquid-absorbing expanded rubber belt 2 is located in the groove 7 of the general rubber belt 1, a first conductive base belt 4 is disposed at a groove bottom of the groove 7 of the general rubber belt 1, a second conductive base belt 5 is disposed on the protrusion 3 of the liquid-absorbing expanded rubber belt 2 toward a surface of the first conductive base belt 4, a gap is disposed between the first conductive base belt 4 and the second conductive base belt 5, and the liquid-absorbing expanded rubber belt 2 is electrically contacted with a corresponding position of the second conductive base belt 4.
Preferably, the first conductive base strip 4 and the second conductive base strip 5 are conductive base strips in the form of coating or electroplated layer, or conductive base strips glued on the plane of the rubber strip.
Preferably, one of the first conductive base tape 4 and the second conductive base tape 5 is a low-resistance conductive base tape functioning as a conductive wire, and the other conductive base tape is a high-resistance conductive base tape functioning as a resistance.
The embodiment adopts the matching of the low-resistance conductive base band and the high-resistance conductive base band, which is beneficial to forming good ohmic contact between the low-resistance conductive base band and the high-resistance conductive base band when liquid leaks, thereby improving the measurement precision.
As one of the preferable schemes for connecting the liquid absorbing expanded rubber belt 2 and the ordinary rubber belt 1 in this embodiment, the connection between the liquid absorbing expanded rubber belt 2 and the ordinary rubber belt 1 is made by gluing.
As a second preferable mode of the connection between the liquid-absorbing expandable rubber band and the ordinary rubber band in this embodiment, the connection between the liquid-absorbing expandable rubber band 2 and the ordinary rubber band 1 is reinforced by using tapping screws 6.
The connection scheme between the two liquid absorption expansion rubber belts 2 and the common rubber belt 1 can be used simultaneously.
In this embodiment, the same ends of the first conductive baseband 4 and the second conductive baseband 5 in the flexible detection band are connected to the resistance detection module respectively, and the resistance detection module is connected to the detection control system; when the storage tank leaks, the bulge part 3 at the liquid leakage position on the liquid absorption expansion rubber belt 2 is expanded after absorbing liquid, so that the first conductive base band 4 is in electric contact with the second conductive base band 5, the resistance detection module sends the detected resistance value between the first conductive base band 4 and the second conductive base band 5 to the detection control system, the detection control system converts the detected resistance value between the first conductive base band 4 and the second conductive base band 5 into the resistance value of the high-resistance conductive base band part between the resistance detection module and the leakage point, converts the resistance value of the high-resistance conductive base band part between the resistance detection module and the leakage point into the length of a section of high-resistance conductive base band between the resistance detection module and the leakage point, and converts the length of the section of high-resistance conductive base band, the spiral winding thread pitch of the flexible detection band on the storage tank and the spiral winding diameter into the specific leakage point position on the storage tank.
Wherein the specific leak location comprises an axial location and a circumferential phase angle location of the leak on the outer wall of the storage tank. The detection control system is provided with a display for displaying the position of the leakage point of the storage tank.
Preferably, the flexible detection belt is spirally wound on the outer wall of the inner storage tank in the double-layer storage tank.
When the flexible detection band is spirally wound on the outer wall of the inner storage tank in the double-layer storage tank, the flexible detection band is actually positioned between the interlayer spaces of the inner storage tank and the outer storage tank. Considering that the flexible detection area can best play the effect of temporary sealing to the leakage position of inlayer storage tank when emergency, can set up the thickness size of flexible detection area just in time and in the double-deck storage tank intermediate layer interval looks adaptation between inlayer storage tank and the outer storage tank, like this when the inlayer storage tank leaks, the position of leaking can directly be plugged up to imbibition inflation rubber belt 2 when inflation in the thickness direction to play the effect of temporary sealing, the security when further having improved the storage tank leakage from this and taking place. By such an arrangement, it is also possible to improve the reliability of electrical contact between the first conductive base tape 4 and the second conductive base tape 5 at the leak position when the liquid leaks. Certainly, in order to ensure that the whole interlayer space is communicated, a plurality of communicating grooves which are distributed at intervals and are perpendicular to the length direction of the common rubber belt 1 can be arranged on the end surface of the common rubber belt 1 close to the outer layer storage tank.
Preferably, the flexible detection strip can be spirally wound on the outer wall of the outer storage tank in the double-layer storage tank.
Example 2:
a detection method using the phase type detection apparatus for leakage of a double-deck storage tank of embodiment 1, characterized by comprising the steps of:
(1) Spirally winding the flexible detection belt on the outer wall of the storage tank at a set screw pitch, and contacting and fixing the liquid absorption expansion rubber belt 2 of the flexible detection belt with the outer wall of the storage tank;
(2) One end of the flexible detection belt is led out through a detection pipeline arranged on the storage tank and then is connected with the resistance detection module, and a signal wire of the resistance detection module is connected to the detection control system;
(3) When the storage tank leaks, liquid at the leakage position of the storage tank is adsorbed by the imbibition expansion rubber belt 2, so that the convex part 3 of the imbibition expansion rubber belt 2 at the leakage position on the imbibition expansion rubber belt 2 expands to cause the first conductive base belt 4 to be electrically contacted with the second conductive base belt 5, the resistance detection module detects that the resistance value between the first conductive base belt 4 and the second conductive base belt 5 changes, the resistance value is reduced to a certain value from infinity, and the detected resistance value is sent to the detection control system, the detection control system calculates the length of a section of high-resistance conductive base belt from the resistance detection module to the leakage point according to the detected resistance value, and converts the length of a non-spiral winding part between the resistance detection module and the leakage point into the position of the specific leakage point on the storage tank after deducting the length of the non-spiral winding part from the resistance detection module to the leakage point according to the length of the section of the high-resistance conductive base belt, the spiral winding pitch of the flexible detection belt on the storage tank and the diameter of the non-spiral winding part.
Wherein, the outer wall of the storage tank can be the outer wall of the inner storage tank or the outer wall of the outer storage tank.
As a further improvement of this embodiment, the flexible detection strip is subjected to a calibration test after being mounted on the storage tank, and the calibration test method is as follows:
(1) Equipartition points are arranged on a common rubber belt 1 of the flexible detection belt at certain intervals, and the axial position and the circumferential position corresponding to each equipartition point on the flexible detection belt spirally wound on the outer wall part of the storage tank relative to the storage tank are recorded;
(2) Manually pressing the positions of the equant points on the common rubber belt one by one to simulate the leakage of the positions of the equant points, so that the first conductive base band 4 and the second conductive base band 5 which are positioned at the equant points are electrically contacted, and measuring the resistance value of each electrical contact by using a universal meter and recording the resistance value;
(3) According to the discrete data of the resistance values corresponding to the positions of the equal dividing points measured by the universal meter, processing the discrete data by adopting a least square method to obtain the resistance values corresponding to any positions on the flexible detection belt, so that a relation curve of the resistance values and the leakage positions is formed; the relationship is used to determine the actual leak location when the tank liquid leaks.
Preferably, the relation curve is written into a detection control system, and when the liquid in the storage tank leaks, the detection control system automatically judges the liquid leakage position according to the relation curve.
In this embodiment, the detection control system may adopt an MCU detection control system.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A phase type detection device for leakage of a double-layer storage tank is characterized by comprising a liquid leakage flexible detection belt spirally wound on the outer wall of the storage tank, wherein the flexible detection belt comprises a liquid absorption expansion rubber belt with a protruding part on one surface and a common rubber belt with a groove on one surface, the protruding part is arranged in the full length direction of the liquid absorption expansion rubber belt, the groove is arranged in the full length direction of the common rubber belt, the liquid absorption expansion rubber belt and the common rubber belt are connected together in an involutory mode, the protruding part of the liquid absorption expansion rubber belt is located in the groove of the common rubber belt, a first conductive base belt is arranged at the groove bottom of the common rubber belt, a second conductive base belt is arranged on the protruding part of the liquid absorption expansion rubber belt towards one surface of the first conductive base belt, a gap is arranged between the first conductive base belt and the second conductive base belt, and the liquid absorption expansion rubber belt expands after liquid absorption and enables the second conductive base belt at the position of the protruding part to be in electrical contact with the corresponding position of the first conductive base belt;
one of the first conductive base band and the second conductive base band is a low-resistance conductive base band which plays a role of a wire, and the other conductive base band is a high-resistance conductive base band which plays a role of a resistor;
the same ends of a first conductive base band and a second conductive base band in the flexible detection band are respectively connected to a resistance detection module, and the resistance detection module is connected with a detection control system; when the storage tank leaks, the bulge that is located liquid leakage department on the imbibition inflation rubber tape takes place the inflation after the imbibition for first electrically conductive baseband and the electrically conductive baseband electrical contact of second, resistance detection module will detect resistance value between first electrically conductive baseband and the electrically conductive baseband of second sends detection control system, and detection control system will detect resistance value between first electrically conductive baseband and the electrically conductive baseband of second converts to the resistance value of the electrically conductive baseband part of high resistance between starting to the resistance detection module from the leakage point, and converts the resistance value of the electrically conductive baseband part of high resistance between starting to the resistance detection module from the leakage point into the electrically conductive baseband length of one section high resistance between starting to the resistance detection module from the leakage point, again according to electrically conductive baseband length of one section high resistance, flexible detection area spiral winding's pitch and spiral winding's diameter on the storage tank convert to concrete leakage point position on the storage tank.
2. The phase type detection device for the leakage of the double-layer storage tank as claimed in claim 1, wherein the connection between the liquid absorption expansion rubber belt and the common rubber belt is made by gluing.
3. The phase type detection device for the leakage of the double-layer storage tank as claimed in claim 1, wherein the connection between the liquid-absorbing expansion rubber belt and the common rubber belt is reinforced by self-tapping screws.
4. The phased detector arrangement for double-deck tank leakage according to claim 1, wherein said flexible detection strip is helically wound around the outer wall of the inner tank of the double-deck tank; or the flexible detection belt is spirally wound on the outer wall of the outer storage tank in the double-layer storage tank.
5. The phase type detection device for the leakage of the double-layer storage tank according to claim 4, wherein when the flexible detection strip is spirally wound on the outer wall of the inner storage tank in the double-layer storage tank, the thickness of the flexible detection strip is set to be matched with the interlayer distance between the inner storage tank and the outer storage tank in the double-layer storage tank; and a plurality of communicating grooves which are distributed at intervals and are vertical to the length direction of the common rubber belt are arranged on the end surface of one side of the common rubber belt close to the outer storage tank.
6. A method of detecting a phase type detection device for leakage of a double tank according to any one of claims 1 to 5, comprising the steps of:
(1) Spirally winding the flexible detection belt on the outer wall of the storage tank at a set screw pitch, and contacting and fixing the liquid absorption expansion rubber belt of the flexible detection belt with the outer wall of the storage tank;
(2) One end of the flexible detection belt is led out through a detection pipeline arranged on the storage tank and then is connected with the resistance detection module, and a signal wire of the resistance detection module is connected to the detection control system;
(3) When the storage tank leaks, the liquid at the leakage position of the storage tank is absorbed by the imbibition expansion rubber belt, so that the bulge part of the imbibition expansion rubber belt at the leakage position on the imbibition expansion rubber belt expands to cause the electric contact of the first conductive base belt and the second conductive base belt, the resistance value between the first conductive base belt and the second conductive base belt is detected to change by the resistance detection module, the resistance value is reduced to a certain resistance value from infinity, the detected resistance value is sent to the detection control system, the detection control system calculates the length of a section of high-resistance conductive base belt from the resistance detection module to the leakage point according to the detected resistance value, and then the length of the section of high-resistance conductive base belt, the spiral winding pitch of the flexible detection belt on the storage tank and the spiral winding diameter are deducted from the resistance detection module to the non-spiral winding part between the leakage point, and the conversion is converted into the position of the specific leakage point on the storage tank.
7. The method for detecting the phase type detection device for the leakage of the double-layer storage tank as claimed in claim 6, wherein the flexible detection strip is subjected to a calibration test after being installed on the storage tank, and the calibration test method comprises the following steps:
(1) Equally dividing points are arranged on a common rubber belt of the flexible detection belt at certain intervals, and the axial position and the circumferential position corresponding to each equally dividing point on the flexible detection belt spirally wound on the outer wall part of the storage tank relative to the storage tank are recorded;
(2) Manually pressing the positions of the equant points on the common rubber belt one by one to simulate the leakage of the positions of the equant points, so that the first conductive base band and the second conductive base band which are positioned at the equant points are electrically contacted, and measuring the resistance value of each electrical contact by using a universal meter and recording the resistance value;
(3) According to the discrete data of the resistance values corresponding to the positions of the equal dividing points measured by the universal meter, processing the discrete data by adopting a least square method to obtain the resistance values corresponding to any positions on the flexible detection belt, so that a relation curve of the resistance values and the leakage positions is formed; the relationship is used to determine the actual leak location when the tank liquid leaks.
8. The method as claimed in claim 7, wherein the relationship curve is written into a detection control system, and the detection control system automatically determines the liquid leakage position according to the relationship curve when the liquid in the storage tank leaks.
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| JP2005265469A (en) * | 2004-03-16 | 2005-09-29 | Toyama Kensa Kk | Leakage inspection device and leakage inspection method of liquid storage tank |
| CN204165716U (en) * | 2014-10-31 | 2015-02-18 | 北汽福田汽车股份有限公司 | Leak detection apparatus and system |
| CN106404310B (en) * | 2016-09-14 | 2019-06-07 | 深圳市祥为测控技术有限公司 | Oil Leakage Detecting cable and leakage detection device |
| CN110271785A (en) * | 2018-03-13 | 2019-09-24 | 中国石油化工股份有限公司 | A kind of distribution storage tank bottom plate leakage monitor |
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| CN111520544A (en) * | 2020-05-18 | 2020-08-11 | 浙江亚德复合材料有限公司 | Intelligent composite pipeline with built-in liquid leakage film sensor and manufacturing process thereof |
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