CN110715162A - Protection device for on-off type burst early warning detection line or conductive coating - Google Patents

Protection device for on-off type burst early warning detection line or conductive coating Download PDF

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Publication number
CN110715162A
CN110715162A CN201911171174.3A CN201911171174A CN110715162A CN 110715162 A CN110715162 A CN 110715162A CN 201911171174 A CN201911171174 A CN 201911171174A CN 110715162 A CN110715162 A CN 110715162A
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China
Prior art keywords
coating
protection
wall
wire
line
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Chinese (zh)
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张卫社
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/04—Protecting sheathings
    • F17C1/06—Protecting sheathings built-up from wound-on bands or filamentary material, e.g. wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/012—Reinforcing means on or in the wall, e.g. ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0607—Coatings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

A protection device for an on-off type burst warning detection line or conductive coating. The distance between the outermost point of the outer peripheral surface of the protection wire and the outer wall surface is larger than the distance between the outermost point of the outer peripheral surface of the detection wire or the conductive coating and the outer wall surface. The invention arranges a protection line on the outer wall surface of the pressure container or the pressure pipeline in parallel with the detection line or the conductive coating. In the processes of carrying, installing and using the pressure container or the pressure pipeline, when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection line can bear the outside pressure earlier than the detection line or the conductive coating, so that the external pressure can be prevented from acting on the detection line or the conductive coating, and the false alarm caused by the accidental breakage of the detection line or the conductive coating is avoided.

Description

Protection device for on-off type burst early warning detection line or conductive coating
Technical Field
The invention belongs to the technical field of safety devices, and particularly relates to a protection device for an on-off type burst early warning detection line or a conductive coating laid on the outer wall of a pressure container or a pressure pipeline.
Background
Fig. 1 is a schematic structural diagram of an on-off type burst early warning detection line 1 (hereinafter referred to as a detection line) wound and laid on the surface of a cylinder pressure vessel bottle wall or a pressure pipeline wall 5 (hereinafter referred to as an outer wall) in a spiral manner at a certain interval. As shown in fig. 1, when a crack is generated in the pressure vessel or the pressure pipeline and the crack is expanded to a certain extent and is plastically deformed, the detection wire 1 laid on the surface of the outer wall 5 is correspondingly deformed, and when the deformation of the detection wire 1 exceeds a certain value, the detection wire is broken, and then an alarm device connected with the detection wire 1 can be used for sending out an alarm signal to prevent the pressure vessel or the pressure pipeline from being suddenly exploded. However, in the process of carrying, installing and using the pressure vessel or the pressure pipeline which is provided with the detection line 1, collision or extrusion can occur, and the detection line 1 has low elongation and is easy to be extruded and broken, thereby causing false alarm, so that the problem of false alarm caused by the fact that the detection line 1 which is arranged on the outer wall 4 is extruded by external force collision and broken needs to be solved.
Disclosure of Invention
In order to solve the above problems, it is an object of the present invention to provide a protection device for an on-off type burst warning detection line or conductive coating laid on the outer wall of a pressure vessel or a pressure pipe.
In order to achieve the above object, the present invention provides a protection device for an on-off type burst early warning probe line, which is a protection line that is provided on an outer wall surface of a pressure vessel or a pressure pipe in parallel with a probe line adhered to the outer wall surface through a first primer layer and adhered or directly laid on the outer wall surface through a second primer layer, wherein a distance from an outermost point of an outer circumferential surface of the protection line to the outer wall surface is greater than a distance from an outermost point of the outer circumferential surface of the probe line to the outer wall surface.
The diameter of the detection wire is between 0.05mm and 2mm, the thickness of the first bottom coating is between 0.05mm and 0.5mm, the thickness of the second bottom coating is between 0.05mm and 0.5mm, and the diameter of the protection wire is between 0.05mm and 3 mm.
The residual elongation of the protective line should be greater than the residual elongation of the probe line.
The residual stress of the protection line is more than or equal to 30MPa and less than or equal to 300 MPa.
The protection wire is made of a metal conductive material or a non-metal material, and the non-metal material comprises glass fiber or carbon fiber; when the protection line is made of metal conductive material, the protection line can be connected with the detection line in series to form a detection loop.
When one protection line is adopted, the protection line and the detection line are arranged on one side of the detection line in a parallel mode; when two protection wires are used, the protection wires and the detection wire are respectively arranged on two sides of the detection wire in a position relation.
The protection device for the on-off type burst early warning detection line further comprises a surface coating layer laid outside the detection line and the protection line.
The surface coating is made of insulating or non-insulating materials, and when the detection line and the protection line are provided with insulating layers, the surface coating is made of non-insulating materials and the laying thickness is 0.05 mm-3 mm.
The invention provides a protection device for an on-off type burst early warning conductive coating, which is a protection line which is arranged on the outer wall surface of a pressure container or a pressure pipeline in a parallel mode with the conductive coating adhered on the outer wall surface through a first bottom coating and adhered or directly laid on the outer wall surface through a second bottom coating, wherein the distance between the outermost point of the outer peripheral surface of the protection line and the outer wall surface is larger than the distance between the outermost point of the outer peripheral surface of the conductive coating and the outer wall surface.
The conductive coating is formed by mixing conductive powder in insulating or non-insulating coating, glue or paint to form conductive coating, conductive glue or conductive paint, coating the conductive coating, conductive glue or conductive paint on the surface of the outer wall in a linear state by using a coating construction process including spraying, brushing and rolling coating, and forming a coating, a glue film or a paint film of an organic, inorganic or organic/inorganic composite material with toughness and conductive performance after curing, or firstly coating the insulating or non-insulating coating, glue or paint on the surface of the outer wall in a linear state by using a coating construction process including spraying, brushing and rolling coating, and then coating the conductive powder on the surface of the coating, glue or paint, and forming a coating, a glue film or a paint film of an organic, inorganic or organic/inorganic composite material with toughness and conductive performance after curing; when the cross section of the conductive coating is square, the thickness is between 0.01mm and 1mm, the width is between 0.1mm and 10mm, and other shapes including round, oval and diamond can also be adopted.
The invention provides a protection device for an on-off type burst early warning detection line or a conductive coating, which is characterized in that a protection line is arranged on the outer wall surface of a pressure container or a pressure pipeline in parallel with the detection line or the conductive coating. In the process of carrying, installing and using the pressure container or the pressure pipeline, because the distance between the outermost point of the outer peripheral surface of the protection wire and the outer wall surface is greater than the distance between the outermost point of the outer peripheral surface of the detection wire or the conductive coating and the outer wall surface, when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire can bear the outside pressure earlier than the detection wire or the conductive coating, so that the external pressure can be prevented or reduced from acting on the detection wire or the conductive coating, and the false alarm of the detection wire or the conductive coating caused by the accidental breakage is avoided.
Drawings
Fig. 1 is a schematic structural diagram of an on-off type burst early warning detection line spirally wound and laid on the surface of the bottle wall of a cylindrical pressure container or the pipe wall of a pressure pipeline at certain intervals.
Fig. 2(a) is a schematic structural diagram of a protection device for an on-off type burst early warning detection line according to the present invention.
FIG. 2(b) is a sectional view taken along line A-A in FIG. 2 (a).
Fig. 3(a) - (c) are schematic diagrams showing three conditions of applying the detection line and the protection line of the present invention on the surface of the bottle wall of the pressure vessel or the outer wall of the pressure pipeline through different thicknesses and types of the base coatings.
Fig. 4(a) - (b) are schematic diagrams showing the positional relationship between the protection line and the detection line in two embodiments of the present invention.
Fig. 5 is a schematic view of applying a top coat on the probe line and the protection line.
Fig. 6(a) is a schematic structural view of a protection device for an on-off type burst warning conductive coating provided by the present invention.
Fig. 6(b) is a sectional view taken along line a-a in fig. 6 (a).
Fig. 7(a) - (b) are schematic cross-sectional views of conductive coatings in two different molding structures.
Fig. 8(a) - (c) are schematic diagrams showing three conditions that the conductive coating and the protection wire of the present invention are applied on the surface of the bottle wall of the pressure vessel or the outer wall of the pressure pipeline through different thicknesses and types of the base coatings.
Fig. 9(a) - (b) are schematic diagrams showing the positional relationship between the protection line and the conductive coating layer according to two embodiments of the present invention.
Fig. 10 is a schematic view of applying a topcoat over the conductive coating and the protection line.
Detailed Description
The protection device for an on-off type burst warning detection line or conductive coating provided by the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The same components as those of the prior art are denoted by the same reference numerals, and detailed descriptions thereof are omitted.
Example one
As shown in fig. 2, the protection device for the on-off type burst early warning detection line provided in this embodiment is a protection device for an external wall 5 of a pressure vessel or a pressure pipe, which is provided in parallel with a detection line 1 (having a diameter of 0.05mm to 2 mm) adhered to the surface of the external wall 5 by a first primer layer 3 (having a thickness of 0.05mm to 0.5 mm) and is adhered by a second primer layer 4 (having a thickness of 0.05mm to 0.5 mm) or directly applied to the surface of the external wall 5 by a second primer layer 2 (having a diameter of 0.05mm to 3 mm), and the distance from the outermost point of the outer circumferential surface of the protection line 2 to the surface of the external wall 5 is greater than the distance from the outermost point of the outer circumferential surface of the detection line 1 to the surface of the external wall 5. In the process of carrying, mounting and using the pressure container or the pressure pipeline, because the distance between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost point of the outer peripheral surface of the detection wire 1 and the surface of the outer wall 5, when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire 2 can bear the outside pressure earlier than the detection wire 1, so that the external pressure can be prevented or reduced from acting on the detection wire 1, and the accidental breakage of the detection wire 1 is avoided.
Generally, the detection line 1 is spirally disposed on the surface of the outer wall 5 of the cylindrical pressure vessel or pressure pipeline, and the protection line 2 may be spirally laid. When the detection line 1 adopts other laying modes, the laying of the protection line 2 can be adjusted correspondingly, but the two modes are always arranged in parallel.
The parallel arrangement means that the distance delta between the closest points of the section contour lines of the protection line 2 and the detection line 1 is required to be smaller than a set value deltadSetting the value deltadThe value range of (A) is 0-10 mm, preferably 1-5 mm; the pitch δ may be constant or indefinite, and when the pitch δ is constant or indefinite other than 0, the protection line 2 and the probe line 1 are substantially parallel to each other, and when the pitch δ is 0, the protection line 2 should be made of an insulating material, otherwise the on/off of the probe line 1 is affected. In addition, the protection wire 2 should not be laid to overlap the probe wire 1 up and down, that is, the protection wire 2 should not be pressed against the outside of the probe wire 1, so as to prevent the pressing force acting on the protection wire 2 from being transmitted to the probe wire 1.
The residual elongation of the protection wire 2 (typically between 0.1% and 40%) should be greater than the residual elongation of the protected probe wire 1 (typically between 0.05% and 1%). Otherwise, when the protection wire 2 is impacted or extruded by external force, if the residual elongation of the protection wire is small, the protection wire is easily broken by extrusion, so that the protection effect is influenced. The residual elongation is the difference between the elongation at the time of the breaking of the material itself of the probe wire 1 or the protective wire 2 and the elongation that has occurred in the rated operating state.
The residual stress of the protection line 2 should be equal to or greater than 30MPa and equal to or less than 300 MPa. If the residual stress of the protection wire 2 is too large, the protection wire 2 is not easily elongated and deformed when the outer wall 5 is plastically deformed, and the first primer layer 3 and the second primer layer 4 limit the amount of deformation transferred from the outer wall 5 to the probe wire 1, thereby reducing the alarm sensitivity of the probe wire 1. The residual stress is the difference between the breaking stress of the material of the protective wire 2 itself and the stress generated by the extension of the protective wire in the rated operation state.
The cross-sections of the guard line 2 and the probe line 1 are generally circular, but may be other shapes such as oval, square, and diamond. The cross-sectional area of the probe wire 1 and the protective wire 2 is preferably 0.01mm2～5mm2。
The protection wire 2 is made of a metal conductive material or a non-metal material, and the non-metal material comprises glass fiber or carbon fiber wires and the like. When the protection line 2 is made of metal conductive material, the protection line can be connected with the detection line 1 in series to form a detection loop.
The detection wire 1 and the protection wire 2 can be adhered on the surface of an outer wall 5 of a pressure vessel or a pressure pipeline through a first insulated primer layer 3 and a second insulated primer layer 4, and the surface of the outer wall 5 can be the circumferential surface of a cylinder or two end surfaces of the cylinder. When the detection line 1 itself is provided with an insulating layer, the first primer layer 3 may be a non-insulating material coating. When the protection wire 2 is not adhered to the surface of the outer wall 5 by the second primer layer 4, it may be directly wound on the surface of the outer wall 5 by pretension, or may be applied to the surface of the outer wall 5 by welding, coating on both sides, or the like.
According to the basic principle described above and the different application thicknesses and types of the first primer layer 3 and the second primer layer 4, the following three different forms can be distinguished:
the first form:
as shown in fig. 3(a), when the thickness of the first primer layer 3 at the position where the probe wire 1 is disposed is the same as that of the second primer layer 4 at the position where the protection wire 2 is disposed, the diameter of the protection wire 2 should be larger than that of the probe wire 1 to ensure that the distance H from the outermost point of the outer circumferential surface of the protection wire 2 to the surface of the outer wall 5 is larger than the distance H' from the outermost point of the outer circumferential surface of the probe wire 1 to the surface of the outer wall 5, and the height difference should be in the range of 0.01mm to 1mm, preferably 0.3mm to 0.8 mm. The first bottom coating 3 at the position where the detection line 1 is arranged can be made of the same material as or different from the second bottom coating 4 at the position where the protection line 2 is arranged, and can be laid simultaneously or successively, and the thickness of the bottom coatings is preferably 0.05 mm-1 mm.
The second form:
as shown in fig. 3(b), when the thickness of the first primer layer 3 at the position where the detection wire 1 is disposed is greater than the thickness of the second primer layer 4 at the position where the protection wire 2 is disposed (the thickness of the second primer layer 4 may be 0), the diameter of the protection wire 2 should be greater than the diameter of the detection wire 1 and it is ensured that the distance H from the outermost point of the outer peripheral surface of the protection wire 2 to the surface of the outer wall 5 is greater than the distance H' from the outermost point of the outer peripheral surface of the detection wire 1 to the surface of the outer wall 5, and the height difference should be in the range of 0.01mm to 1mm, preferably 0.3mm to 0.8. The first bottom coating 3 at the position where the detection line 1 is arranged can be made of the same material as or different from the second bottom coating 4 at the position where the protection line 2 is arranged, and can be laid simultaneously or successively, and the thickness of the bottom coatings is preferably 0.05 mm-1 mm.
The third form:
as shown in fig. 3(c), when the thickness of the first undercoat layer 3 at the location where the probe wire 1 is provided is smaller than the thickness of the second undercoat layer 4 at the location where the protection wire 2 is provided, the diameter of the protection wire 2 may be equal to or larger than the diameter of the probe wire 1, or may be smaller than the diameter of the probe wire 1, but the distance H between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is ensured to be larger than the distance H' between the outermost point of the outer peripheral surface of the probe wire 1 and the surface of the outer wall 5, and the height difference is preferably in the range of 0.01mm to 1mm, more preferably 0.3mm to 0. The first bottom coating 3 at the position where the detection line 1 is arranged can be made of the same material as or different from the second bottom coating 4 at the position where the protection line 2 is arranged, and can be laid simultaneously or successively, and the thickness of the bottom coatings is preferably 0.05 mm-1 mm.
Example two
The protection device for the on-off type burst early warning detection line laid on the outer wall surface of the pressure vessel or the pressure pipeline provided by the embodiment is one to two protection lines 2 which are arranged on the outer wall 5 surface of the pressure vessel or the pressure pipeline in parallel with the detection line 1 adhered on the outer wall 5 surface through the first primer layer 3 and adhered on the outer wall 5 surface through the second primer layer 4, and the distance between the outer peripheral surface outermost point of the protection line 2 and the outer wall 5 surface is larger than the distance between the outer peripheral surface outermost point of the detection line 1 and the outer wall 5 surface. When one protection wire 2 is used, the protection wire 2 and the protected probe wire 1 are positioned in such a manner that the protection wire 2 is disposed in parallel on one side of the probe wire 1, as shown in fig. 4 (a); when two protection wires 2 are used, the protection wires 2 and the protected probe wire 1 are arranged in a positional relationship such that one protection wire 2 is provided on each side of the probe wire 1, as shown in fig. 4 (b).
In the process of carrying, mounting and using the pressure container or the pressure pipeline, the distance between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost point of the outer peripheral surface of the detection wire 1 and the surface of the outer wall 5, so that when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire 2 can bear the outside pressure earlier than the detection wire 1, the outside pressure can be prevented or reduced from acting on the detection wire 1, and the accidental breakage of the detection wire 1 is avoided.
EXAMPLE III
The protection device for the on-off type burst early warning detection line laid on the outer wall surface of the pressure container or the pressure pipeline comprises a protection line 2 and a surface coating 6; wherein the protective wire 2 is arranged on the surface of the outer wall 5 of the pressure vessel or the pressure pipeline in a manner of being parallel to the detection wire 1 which is adhered on the surface of the outer wall 5 through the first bottom coating 3 and is adhered on the surface of the outer wall 5 through the second bottom coating 4, and the distance between the outermost point of the outer peripheral surface of the protective wire 2 and the surface of the outer wall 5 is larger than the distance between the outermost point of the outer peripheral surface of the detection wire 1 and the surface of the outer wall 5; the surface coating 6 is laid outside the detection line 1 and the protection line 2; as shown in fig. 5. In the process of carrying, mounting and using the pressure container or the pressure pipeline, because the distance between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost point of the outer peripheral surface of the detection wire 1 and the surface of the outer wall 5, when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire 2 can bear the outside pressure earlier than the detection wire 1, so that the external pressure can be prevented or reduced from acting on the detection wire 1, and the accidental breakage of the detection wire 1 is avoided.
The top coating 6 can be made of insulating or non-insulating material, and when the detection line 1 and the protection line 2 have insulating layers, the top coating 6 can be made of non-insulating material, and the laying thickness is generally 0.05 mm-3 mm.
Example four
As shown in fig. 6, the protection device for the on-off type burst warning conductive coating provided in this embodiment is a protection wire 2 (diameter between 0.05mm and 3 mm) which is provided on the surface of the outer wall 5 of a pressure vessel or a pressure pipe in parallel with a conductive coating 7 (thickness between 0.01mm and 1mm and width between 0.1mm and 10 mm) adhered to the surface of the outer wall 5 by a first primer layer 3 (thickness between 0.05mm and 0.5 mm) and adhered by a second primer layer 4 (thickness between 0.05mm and 0.5 mm) or directly applied to the surface of the outer wall 5, and the distance between the outermost peripheral point of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost peripheral point of the conductive coating 7 and the surface of the outer wall 5. In the process of carrying, mounting and using the pressure container or the pressure pipeline, because the distance between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost point of the outer peripheral surface of the conductive coating 7 and the surface of the outer wall 5, when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire 2 can bear the outside pressure earlier than the conductive coating 7, so that the external pressure can be prevented or reduced from acting on the conductive coating 7, and the accidental breakage of the conductive coating 7 is avoided.
The conductive coating 7 is formed by mixing conductive powder in insulating or non-insulating paint, glue or lacquer to form conductive paint, conductive glue or conductive lacquer, then coating the conductive paint, conductive glue or conductive lacquer on the surface of the outer wall 5 in a linear state by using a coating construction process including spraying, brushing and rolling, and forming a coating, a glue film or a paint film of an organic, inorganic or organic/inorganic composite material with certain toughness and conductivity after curing, as shown in fig. 7 (a). Or the insulating or non-insulating coating, glue or paint can be coated on the surface of the outer wall 5 in a linear state by a coating construction process including spraying, brushing and rolling, then the conductive powder is coated on the surface of the coating, glue or paint, and a coating, a glue film or a paint film of an organic, inorganic or organic/inorganic composite material with certain toughness and conductivity is formed after curing, as shown in fig. 7(b), the conductive coating 7 formed by the method is divided into an inner layer and an outer layer, the junction of the conductive powder layer of the inner layer and the coating, glue or paint layer of the outer layer has certain blending thickness, and a structure H between the innermost end of the blending part and the outermost end of the conductive powder layer1' is a toolAn active part of the conductive coating 7 having a certain toughness. Structures H on the conductive coating 7 when the coating, glue or lacquer is an insulating material2' may be used as the whole of the first undercoat layer 3 or as part of the first undercoat layer 3.
The conductive coating 7 is generally square in cross section, with a thickness of 0.01mm to 1mm and a width of 0.1mm to 10mm, but any shape including circular, oval, and diamond can be used.
Usually, the conductive coating 7 is spirally disposed on the outer wall 5 surface of the cylindrical pressure vessel or pressure pipeline, and the protection wire 2 may be spirally laid. When the conductive coating 7 is applied in another way, the application of the protective wire 2 can be adjusted accordingly, but the two are always arranged in parallel.
The parallel arrangement means that the distance delta between the closest points of the cross-section contour lines of the protective line 2 and the conductive coating 7 is required to be less than a set value deltadSetting the value deltadThe value range of (A) is 0-10 mm, preferably 1-5 mm; the distance δ may be a fixed value or an indefinite value, and when the distance δ is a fixed value or an indefinite value other than 0, the protection line 2 and the conductive coating 7 are in a substantially parallel state, and when the distance δ is 0, the protection line 2 should be made of an insulating material, otherwise the on/off of the conductive coating 7 is affected. Furthermore, the protective wire 2 should not be laid to overlap the conductive coating 7, i.e., the protective wire 2 should not be pressed against the outside of the conductive coating 7, so that the pressing force acting on the protective wire 2 is not transmitted to the conductive coating 7.
The residual elongation of the protective wire 2 (typically between 0.1% and 40%) should be greater than the residual elongation of the conductive coating 7 to be protected (typically between 0.05% and 5%). Otherwise, when the protection wire 2 is impacted or extruded by external force, if the residual elongation of the protection wire is small, the protection wire is easily broken by extrusion, so that the protection effect is influenced. The residual elongation is the difference between the elongation at the time of the breaking of the conductive coating 7 or the material itself of the protective wire 2 and the elongation that has occurred in the rated operating state. The elongation of the conductive coating 7 in the rated working state can be formed by laying in a cold state and then expanding by heating, or by adding air after laying.
The residual stress of the protection line 2 should be equal to or greater than 30MPa and equal to or less than 300 MPa. If the residual stress of the protection wire 2 is too large, when the outer wall 5 is plastically deformed, the protection wire 2 is not easily elongated and deformed, and the amount of deformation transferred from the outer wall 5 to the conductive coating 7 is limited by the first primer layer 3 and the second primer layer 4, thereby reducing the alarm sensitivity of the conductive coating 7. The residual stress is a difference between a breaking stress of the material of the protective wire 2 itself and a stress generated by stretching the protective wire 2 in a rated operation state.
The cross section of the protection wire 2 is generally circular, but may be other shapes such as oval, square, and diamond. The cross-sectional area of the protective wire 2 is preferably 0.01mm2～5mm2。
The protection wire 2 is made of a metal conductive material or a non-metal material, and the non-metal material comprises glass fiber or carbon fiber wires and the like. When the protection wire 2 is made of metal conductive material, the protection wire can be connected with the conductive coating 7 in series to form a detection loop.
The conductive coating 7 and the protective wire 2 are adhered to the surface of the outer wall 5 of the pressure vessel or the pressure pipeline through the first primer coating 3 and the second primer coating 4 which are insulated, and the surface of the outer wall 5 can be the circumferential surface of a cylinder or two end surfaces of the cylinder. When the protection wire 2 is not adhered to the surface of the outer wall 5 by the second primer layer 4, it may be directly wound on the surface of the outer wall 5 by pretension, or may be applied to the surface of the outer wall 5 by welding, coating on both sides, or the like.
According to the basic principle described above and the different application thicknesses and types of the first primer layer 3 and the second primer layer 4, the following three different forms can be distinguished:
the first form:
as shown in fig. 8(a), when the thickness of the first primer layer 3 at the location where the conductive coating 7 is disposed is the same as that of the second primer layer 4 at the location where the protection wire 2 is disposed, the diameter of the protection wire 2 must be larger than the thickness of the conductive coating 7 to ensure that the distance H from the outermost point of the outer circumferential surface of the protection wire 2 to the surface of the outer wall 5 is larger than the distance H' from the outermost point of the outer circumferential surface of the conductive coating 7 to the surface of the outer wall 5, and the height difference is in the range of 0.01mm to 1mm, preferably 0.3mm to 0.8 mm. The first bottom coating 3 at the position where the conductive coating 7 is arranged can be made of the same material as or different from the second bottom coating 4 at the position where the protection wire 2 is arranged, and can be laid simultaneously or successively, and the thickness of the bottom coatings is preferably 0.05 mm-1 mm.
The second form:
as shown in fig. 8(b), when the thickness of the first undercoat layer 3 where the conductive coating layer 7 is provided is greater than the thickness of the second undercoat layer 4 where the protective wire 2 is provided (the thickness of the second undercoat layer 4 may be 0), the diameter of the protective wire 2 must be greater than the thickness of the conductive coating layer 7 and it is ensured that the distance H from the outermost point of the outer peripheral surface of the protective wire 2 to the surface of the outer wall 5 is greater than the distance H' from the outermost point of the outer peripheral surface of the conductive coating layer 7 to the surface of the outer wall 5, and the height difference is in the range of 0.01mm to 1mm, preferably 0.3mm to 0.8 mm. The first bottom coating 3 at the position where the conductive coating 7 is arranged can be made of the same material as or different from the second bottom coating 4 at the position where the protection wire 2 is arranged, and can be laid simultaneously or successively, and the thickness of the bottom coatings is preferably 0.05 mm-1 mm.
The third form:
as shown in fig. 8(c), when the thickness of the first undercoat layer 3 where the conductive coating layer 7 is provided is smaller than the thickness of the second undercoat layer 4 where the protective wire 2 is provided, the diameter of the protective wire 2 may be equal to or greater than the thickness of the conductive coating layer 7, or may be smaller than the thickness of the conductive coating layer 7, but the distance H between the outermost point of the outer peripheral surface of the protective wire 2 and the surface of the outer wall 5 is ensured to be greater than the distance H' between the outermost point of the outer peripheral surface of the conductive coating layer 7 and the surface of the outer wall 5, and the height difference is preferably in the range of 0.01mm to 1mm, more preferably 0.3mm to 0.8 mm. The first bottom coating 3 at the position where the conductive coating 7 is arranged can be made of the same material as or different from the second bottom coating 4 at the position where the protection wire 2 is arranged, and can be laid simultaneously or successively, and the thickness of the bottom coatings is preferably 0.05 mm-1 mm.
EXAMPLE five
The protection device for the on-off type burst early warning detection line laid on the outer wall surface of the pressure vessel or the pressure pipeline provided by the embodiment is one to two protection lines 2 which are arranged in parallel with the conductive coating 7 adhered on the outer wall 5 surface through the first primer 3 and adhered on the outer wall 5 surface through the second primer 4 on the outer wall 5 surface of the pressure vessel or the pressure pipeline, and the distance between the outermost point of the outer peripheral surface of the protection line 2 and the outer wall 5 surface is larger than the distance between the outermost point of the outer peripheral surface of the conductive coating 7 and the outer wall 5 surface. When one protection wire 2 is used, the protection wire 2 is disposed in a positional relationship with the conductive coating 7 to be protected in such a manner that the protection wire 2 is disposed on one side of the conductive coating 7 in a parallel manner, as shown in fig. 9 (a); when two protection wires 2 are used, the protection wires 2 and the conductive coating 7 to be protected are positioned in such a manner that one protection wire 2 is disposed on each of both sides of the conductive coating 7, as shown in fig. 9 (b).
In the process of carrying, mounting and using the pressure container or the pressure pipeline, the distance between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost point of the outer peripheral surface of the conductive coating 7 and the surface of the outer wall 5, so that when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire 2 can bear the outside pressure earlier than the conductive coating 7, the outside pressure can be prevented or reduced from acting on the conductive coating 7, and the accidental breakage of the conductive coating 7 is avoided.
EXAMPLE six
The protection device for the on-off type burst early warning detection line laid on the outer wall surface of the pressure container or the pressure pipeline comprises a protection line 2 and a surface coating 6; wherein the protective wire 2 is provided on the surface of the outer wall 5 of the pressure vessel or pressure pipe in parallel with the conductive coating 7 adhered on the surface of the outer wall 5 by the first primer coating 3 and adhered on the surface of the outer wall 5 by the second primer coating 4, and the distance from the outermost point of the outer peripheral surface of the protective wire 2 to the surface of the outer wall 5 is larger than the distance from the outermost point of the outer peripheral surface of the conductive coating 7 to the surface of the outer wall 5; the surface coating 6 is laid outside the conductive coating 7 and the protection wire 2; as shown in fig. 10. In the process of carrying, mounting and using the pressure container or the pressure pipeline, because the distance between the outermost point of the outer peripheral surface of the protection wire 2 and the surface of the outer wall 5 is greater than the distance between the outermost point of the outer peripheral surface of the conductive coating 7 and the surface of the outer wall 5, when the pressure container or the pressure pipeline collides or extrudes with the outside, the protection wire 2 can bear the outside pressure earlier than the conductive coating 7, so that the external pressure can be prevented or reduced from acting on the conductive coating 7, and the accidental breakage of the conductive coating 7 is avoided.
The top coating 6 is made of insulating material, and the laying thickness is generally 0.05 mm-3 mm.

Claims (10)

1. A protection device for an on-off type burst early warning detection line is characterized in that: the protection device for the on-off type burst early warning detection line is a protection line (2) which is arranged on the surface of an outer wall (5) of a pressure container or a pressure pipeline in a parallel mode with a detection line (1) adhered to the surface of the outer wall (5) through a first bottom coating (3) and adhered to the surface of the outer wall (5) through a second bottom coating (4) or directly laid on the surface of the outer wall (5), and the distance between the outermost point of the outer peripheral surface of the protection line (2) and the surface of the outer wall (5) is larger than the distance between the outermost point of the outer peripheral surface of the detection line (1) and the surface of the outer wall (5).
2. The protection device for on-off type burst pre-warning detection line of claim 1, wherein: the diameter of the detection line (1) is between 0.05mm and 2mm, the thickness of the first bottom coating (3) is between 0.05mm and 0.5mm, the thickness of the second bottom coating (4) is between 0.05mm and 0.5mm, and the diameter of the protection line (2) is between 0.05mm and 3 mm.
3. The protection device for on-off type burst pre-warning detection line of claim 1, wherein: the residual elongation of the protection wire (2) is larger than that of the detection wire (1).
4. The protection device for on-off type burst pre-warning detection line of claim 1, wherein: the residual stress of the protection line (2) is more than or equal to 30MPa and less than or equal to 300 MPa.
5. The protection device for on-off type burst pre-warning detection line of claim 1, wherein: the protection wire (2) is made of a metal conductive material or a non-metal material, and the non-metal material comprises glass fiber or carbon fiber; when the protection line (2) is made of metal conductive material, the protection line can be connected with the detection line (1) in series to form a detection loop.
6. The protection device for on-off type burst pre-warning detection line of claim 1, wherein: when one protection wire (2) is adopted, the protection wire (2) and the detection wire (1) are arranged in a parallel mode at one side of the detection wire (1) according to the position relation; when two protection wires (2) are adopted, the protection wires (2) and the detection wire (1) are respectively arranged at two sides of the detection wire (1) in a position relation.
7. The protection device for on-off type burst pre-warning detection line of claim 1, wherein: the protection device for the on-off type burst early warning detection line further comprises a surface coating (6) laid outside the detection line (1) and the protection line (2).
8. The protection device for an on-off type burst pre-warning detection line of claim 7, wherein: the surface coating (6) is made of insulating or non-insulating materials, when the detection line (1) and the protection line (2) are provided with insulating layers, the surface coating (6) is made of the non-insulating materials, and the laying thickness is 0.05 mm-3 mm.
9. A protection device for an on-off type burst early warning conductive coating is characterized in that: the protection device for the on-off type burst early warning conductive coating is a protection line (2) which is arranged on the surface of an outer wall (5) of a pressure container or a pressure pipeline in a parallel mode with a conductive coating (7) adhered on the surface of the outer wall (5) through a first bottom coating (3) and adhered through a second bottom coating (4) or directly laid on the surface of the outer wall (5), and the distance from the outermost point of the outer peripheral surface of the protection line (2) to the surface of the outer wall (5) is larger than the distance from the outermost point of the outer peripheral surface of the conductive coating (7) to the surface of the outer wall (5).
10. The protection device for an on-off type burst pre-warning detection line of claim 9, wherein: the conductive coating (7) is formed by mixing conductive powder in insulating or non-insulating coating, glue or paint to form conductive coating, conductive glue or conductive paint, coating the conductive coating, conductive glue or conductive paint on the surface of the outer wall (5) in a linear state by using a coating construction process including spraying, brushing and rolling, and forming a coating, a glue film or a paint film of organic, inorganic or organic/inorganic composite material with toughness and conductivity after curing, or coating the insulating or non-insulating coating, glue or paint on the surface of the outer wall (5) in a linear state by using a coating construction process including spraying, brushing and rolling, and then coating the conductive powder on the surface of the coating, glue or paint, and forming a coating, a glue film or a paint film of organic, inorganic or organic/inorganic composite material with toughness and conductivity after curing; when the cross section of the conductive coating (7) is square, the thickness is between 0.01mm and 1mm, the width is between 0.1mm and 10mm, and other shapes including round, oval and diamond can also be adopted.
CN201911171174.3A 2019-07-03 2019-11-26 Protection device for on-off type burst early warning detection line or conductive coating Pending CN110715162A (en)

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CN111111076A (en) * 2020-01-08 2020-05-08 唐桂娥 Burst early warning detector
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