Method for repairing inner surface of pressure container

Abstract

The invention discloses a method for repairing the inner surface of a pressure container, and relates to the technical field of pressure containers. The repairing method for the inner surface of the pressure container comprises the following steps that the inner surface of a port of the pressure container is polished; coating a primer layer on the inner surface of the polished port, curing and polishing; obtaining the thicknesses of different positions of the primer layer on the inner surface of the port; and determining the thickness of the heat-proof coating layer coated on the surface of the primer layer according to the thickness difference of different positions of the primer layer on the inner surface of the port. The thickness of the heat-proof coating layer coated on the surface of the bottom glue layer is determined according to the thickness difference of different positions of the bottom glue layer on the inner surface of the port, and the thickness of the heat-proof coating layer can be controlled in a one-time forming process, so that the distance between the heat-proof coating layer on the inner surface of the port and the axis of the pressure vessel is consistent after the heat-proof coating layer is finally coated; the precision of the inner molded surface of the heat-proof layer is improved, and the influence on the pressure-bearing performance of the pressure container is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure vessels, in particular to a pressure vessel inner surface repairing method. BACKGROUND

[0002] The high-temperature-resistant pressure vessel is composed of a pressure-bearing shell and a thermal protection structure, and the quality of the thermal protection structure directly affects the normal use of the high-temperature-resistant pressure vessel. At present, due to the difficulty in realizing the integrated forming process, the thermal protection structure is generally divided into a head segment and a cylinder segment, wherein the head segment is pre-formed by mold pressing or air bag pressurization and then solidified and formed together with the shell. During the shell winding and solidification process, due to the deformation of the core mold and the change of the fiber winding tension, a large deviation is usually generated between the inner surface of the formed thermal protection layer and the theoretical design surface, so that the inner surface precision of the thermal protection layer is not high, which affects the use of the pressure vessel. SUMMARY

[0003] The present application provides a pressure vessel inner surface repairing method to solve the problem of low inner surface precision of the thermal protection layer, which affects the use of the pressure vessel.

[0004] In a first aspect, the present application provides a pressure vessel inner surface repairing method, comprising the following steps: polishing the inner surface of the port of the pressure vessel; applying a primer layer on the polished inner surface of the port, solidifying, and polishing; obtaining the thickness of the primer layer at different positions of the inner surface of the port; determining the thickness of the thermal protection coating layer applied on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port.

[0005] The present application determines the thickness of the thermal protection coating layer applied on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port, which can control the thickness of the thermal protection coating layer in one forming process, so that the distance between the thermal protection coating layer on the inner surface of the port and the axis of the pressure vessel is consistent after the thermal protection coating layer is finally applied, the inner surface precision of the thermal protection layer is improved, and the influence on the pressure-bearing performance of the pressure vessel is reduced.

[0006] It should be noted that the pressure vessel is a pressure vessel formed by fiber winding and solidification, i.e., the primer layer and the thermal protection coating layer are applied after the fiber winding and solidification.

[0007] It should be noted that the pressure vessel includes but is not limited to a solid rocket combustion chamber.

[0008] In some embodiments, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0009] In some embodiments, when the inner surface of the port is polished, the primer layer is coated on the polished inner surface of the port, and then cured and polished: The primer layer is usually coated with 2-3 layers to improve the adhesion of the repaired inner surface and the heat-resistant coating; and / or, The material of the primer layer includes at least one of silicone rubber (silane coupling agent, silicone resin, tackifying resin, catalyst, etc.), and the selection of the material of the primer layer from at least one of the above materials can improve the adhesion of the primer layer and the heat-resistant coating; and / or, The Shore hardness of the cured primer layer is A20-A50, and the hardness of the cured primer layer in this range can improve the adhesion of the primer layer and the heat-resistant coating and reduce the risk of cracking; and / or, The curing time of the primer layer is 24-48 h, and the curing time of the primer layer in this range can ensure that the primer layer is fully cured and facilitate subsequent polishing; and / or, The surface roughness of the polished primer layer is 5-15 μm, and the surface roughness of the polished primer layer in this range can ensure that the heat-resistant coating is coated on the primer layer surface without sagging and peeling.

[0010] In some embodiments, the method for obtaining the distance of the different positions of the thickness of the primer layer on the inner surface of the port comprises: setting a detection template rotatable along the circumferential side of the port of the pressure vessel according to the shape of the port of the pressure vessel, and obtaining the thickness of the primer layer on the inner surface of the port at different positions according to the distance between the end of the detection template and the primer layer. The detection template is adapted to the shape of the port of the pressure vessel and is rotated along the circumferential side of the port of the pressure vessel, usually fixed in the axial direction of the port of the pressure vessel and rotated in the circumferential direction. Due to the rotation of the detection template, a plurality of circular rings are formed which are adapted to the shape of the port of the pressure vessel and have the same radius. Therefore, when the detection template rotates around the port of the pressure vessel, the thickness of the primer layer on the inner surface of the port at different positions can be obtained according to the distance between the end of the detection template and the primer layer, and the flatness of the primer layer surface can be evaluated, and the thickness of the heat-resistant coating layer can be determined. The flatness of the port of the pressure vessel is detected by a simple detection template, and the uniformity of the inner surface of the port of the pressure vessel is achieved by adjusting the thickness of the heat-resistant coating layer, instead of first coating the heat-resistant layer, then winding the fiber together with the shell, and finally polishing the heat-resistant coating layer at the protruding position and repairing the heat-resistant coating layer at the recessed position. The process of the present application is simple, and the polishing and repairing of the heat-resistant coating are achieved in the same process, which reduces the delamination of the repair layer, improves the quality of the repair interface, and improves the machining precision of the pressure vessel.

[0011] In some embodiments, the detection template can be fixed on the central axis of the port of the pressure vessel, and the positions in the axial and circumferential directions can be adjusted. The positions of the detection template in the axial and circumferential directions can be adjusted by elongating or shortening the central axis and rotating the flange to adjust the axial and circumferential positions, thereby ensuring that the detection template is as close as possible to the repaired inner surface.

[0012] In some embodiments, one end of the detection template is rotatably connected to the outlet of the port of the pressure vessel, and the other end is rollingly connected to the groove formed at the connection between the port of the pressure vessel and the cylindrical shell. This can reduce the disturbance deformation of the detection template during rotation, improve the precision of the pressure vessel processing, and reduce the resistance during the rotation of the detection template, thereby improving the accuracy of the measurement.

[0013] In some embodiments, the method for measuring the distance between the end of the detection template and the primer layer comprises using a plug gauge to measure the gap between the detection template and the primer layer. The use of a plug gauge can accurately measure the gap between the detection template and the primer layer, thereby improving the manufacturing precision of the pressure vessel. The gap between the detection template and the primer layer can be 2-5 mm.

[0014] It should be noted that when the detection template is installed, the flange can be connected with the joint of the port of the pressure vessel, the bolts are preliminarily locked, the position of the detection template is in a suspended position, and the detection template extends along the axial direction of the pressure vessel; the detection template is adjusted to a position without interference with the inner surface of the port of the pressure vessel, the detection template is rotated by 360°, the deflection angle of the flange is adjusted according to the gap between the inner surface of the port of the pressure vessel and the detection template, the position where the flange and the end surface of the joint have a gap is provided with a gasket, and then all the bolts are locked to complete the fastening of one end of the detection template. The center shaft of the detection template is fixedly installed with the detection template, so that the deflection deformation of the detection template caused by large-angle rotation is reduced; and the support point at the other end of the detection template is rolling friction, so that the resistance in the rotation process of the detection template is reduced.

[0015] When the radial and axial positions of the detection template are adjusted, the bolts of the radial and axial sliding blocks of the rotating detection template are loosened first, the radial sliding block is adjusted to a specified position, and the mounting bolts of the radial sliding block are locked; then the detection template is moved until the detection template is close to the inner surface of the port of the pressure vessel, and the bolts of the axial sliding block are locked.

[0016] In some embodiments, the determining the thickness of the heat-resistant coating layer coated on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port comprises: If the gap between the detection template and the primer layer is greater than the first preset thickness, a first difference value between the gap between the detection template and the primer layer and the first preset thickness is calculated, the heat-resistant coating layer is coated at the corresponding position, and the thickness of the heat-resistant coating layer = the second preset thickness + the first difference value.

[0017] If the gap between the detection template and the primer layer is greater than the first preset thickness, it indicates that the distance between the primer layer at the current position and the edge of the detection template is too large, and a thicker heat-resistant coating layer is needed to make up for the distance difference at the current position. Therefore, the heat-resistant coating layer with a difference thickness is coated on the second preset thickness, so that after the heat-resistant coating layer is coated, the heat-resistant coating layers at all positions form a uniform plane, and the machining precision of the pressure vessel is improved.

[0018] Specifically, the heat-resistant coating layer with the first difference thickness can be coated first, and then the heat-resistant coating layer with the second preset thickness can be coated. The first preset thickness can be 1-3 mm, and the second preset thickness can be 0.5-2 mm.

[0019] In some embodiments, the determining the thickness of the heat-resistant coating layer coated on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port comprises: If the gap between the detection template and the primer layer is less than the first preset thickness, a second difference value between the first preset thickness and the gap between the detection template and the primer layer is calculated, the heat-resistant coating layer is coated at the corresponding position, and the thickness of the heat-resistant coating layer = the second preset thickness - the first difference value.

[0020] If the gap between the detection template and the primer layer is less than the first preset thickness, it indicates that the distance between the primer layer at the current position and the edge of the detection template is too small, and a thinner heat-proof coating layer is needed to eliminate the distance difference at the current position. Therefore, the heat-proof coating layer is applied less by the difference in thickness at the second preset thickness, so that after the heat-proof coating layer is applied, the heat-proof coating layers at various positions form a uniform plane, improving the machining precision of the pressure vessel.

[0021] It should be noted that when the detection template is measured, the gap between the detection template and the primer layer at positions spaced apart by a certain distance, for example, 10-50mm, in the circumferential direction of the inner surface of the pressure vessel port, is usually recorded and marked, and the heat-proof coating layer is applied more or less according to the measurement results. When the heat-proof coating layer is applied, the thickness of each time is 0.5-1mm, and the heat-proof coating layer is applied multiple times.

[0022] In some embodiments, the heat-proof coating includes silicone rubber, and at least one of the above heat-proof coatings can ensure that the heat-proof coating is cured at room temperature and has reliable heat protection performance; and / or, The Shore hardness of the heat-proof coating layer is A60-A80. The hardness of the heat-proof coating layer in this range can make the heat-proof coating fully vulcanized, ensuring the heat protection performance. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 Flow chart of the pressure vessel inner surface repair method of an embodiment of the present application.

[0025] Figure 2 Schematic structural diagram of the detection template of the pressure vessel inner surface repair method of an embodiment of the present application.

[0026] Figure 3 Flow chart of the pressure vessel inner surface repair method of an embodiment of the present application.

[0027] Figure 4 Flow chart of the pressure vessel inner surface repair method of an embodiment of the present application.

[0028] Explanation of reference numerals: 1 pressure vessel; 11 primer layer; 12 cylindrical shell; 121 groove; 2 detection template; 21 end; 22 center axis; 23 flange; 24 long axis. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] High-temperature pressure vessels consist of a pressure-bearing shell and a thermal protection structure. The quality of the thermal protection structure directly affects the normal operation of the high-temperature pressure vessel. Currently, due to the difficulty in achieving integrated molding, the thermal protection structure is generally divided into a head section and a body section. The head section is pre-formed by molding or air-cushion pressurization and then cured together with the shell. During the shell winding and curing process, due to the deformation of the mandrel and changes in fiber winding tension, the inner surface of the formed thermal protection layer usually deviates significantly from the theoretically designed surface, resulting in low accuracy of the inner surface of the thermal protection layer and affecting the use of the pressure vessel.

[0031] In view of this, this application provides a method for repairing the inner surface of a pressure vessel to solve the problem that the existing heat-insulating layer has low inner surface accuracy, which affects the use of the pressure vessel.

[0032] Firstly, such as Figure 1 As shown, this application provides a method for repairing the inner surface of a pressure vessel, including the following steps: S100. Grind the inner surface of the port of the pressure vessel; S200: Apply a base coat to the inner surface of the polished port, cure, and polish. S300, Obtain the thickness of the base adhesive layer at different locations on the inner surface of the port; S400. Determine the thickness of the heat-resistant coating layer applied to the surface of the base layer based on the thickness difference at different locations on the inner surface of the port.

[0033] This application determines the thickness of the heat-resistant coating layer by measuring the thickness difference at different locations on the inner surface of the port's base layer. This allows for control of the heat-resistant coating layer thickness during a one-time molding process, ensuring that after the heat-resistant coating layer is applied, the distance between the heat-resistant coating layer on the inner surface of the port and the axis of the pressure vessel is consistent. This improves the accuracy of the inner surface of the heat-resistant layer and reduces the impact on the pressure-bearing performance of the pressure vessel.

[0034] It should be noted that the pressure vessel is a pressure vessel formed by curing a fiber-wound shell, that is, it is first formed by fiber winding and curing, and then coated with a base layer and a heat-resistant coating layer.

[0035] It should be noted that the pressure vessel mentioned includes, but is not limited to, a solid rocket motor combustion chamber.

[0036] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0037] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0038] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0039] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0040] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0041] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel.

[0042] With reference to the first aspect, in some embodiments of the present application, when the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm. The roughness of the polished inner surface of the port in this range can improve the firmness of the bonding between the primer layer and the base body of the inner surface of the port of the pressure vessel, reduce the peeling of the primer layer, and improve the reliability of the pressure vessel. Figure 2As shown, the method for obtaining the distance comprises: setting a detection template 2 rotatable along the circumferential side of the port of the pressure vessel 1 according to the shape of the port of the pressure vessel 1, and obtaining the thickness of the primer layer 11 at different positions of the inner surface of the port of the pressure vessel 1 according to the distance between the end head 21 of the detection template 2 and the primer layer 11 of the pressure vessel 1. The detection template 2 is adapted to the shape of the port of the pressure vessel 1 and rotates along the circumferential side of the port of the pressure vessel 1, and the detection template 2 is usually fixed in the axial direction of the port of the pressure vessel 1 and rotates in the circumferential direction. Due to the rotation of the detection template 2, a plurality of circular rings adapted to the shape of the port of the pressure vessel 1 are formed, and the radii of the circular rings are the same. Therefore, when the detection template 2 rotates around the port of the pressure vessel 1, the thickness of the primer layer 11 at different positions of the inner surface of the port of the pressure vessel 1 can be obtained according to the distance between the end head 21 of the detection template 2 and the primer layer 11 of the pressure vessel 1, and the flatness of the surface of the primer layer 11 can be evaluated, and the thickness of the heat-resistant coating layer can be determined. The flatness of the port of the pressure vessel 1 is detected by the simple detection template 2, the uniformity of the inner surface of the port of the pressure vessel 1 is realized by adjusting the thickness of the heat-resistant coating layer, instead of first coating the heat-resistant layer, then winding the fiber together with the shell, and finally polishing the heat-resistant coating layer at the protruding position and repairing the heat-resistant coating layer at the recessed position. The process of the present application is simple, and the polishing and repairing of the heat-resistant coating are realized in the same process, which reduces the delamination of the repaired layer, improves the quality of the repaired interface, and improves the machining precision of the pressure vessel 1.

[0043] In combination with the first aspect, in some embodiments provided by the present application, the detection template 2 can be fixed on the central axis of the port of the pressure vessel 1, and the positions in the axial direction and the circumferential direction are adjustable. The positions of the detection template 2 in the axial direction and the circumferential direction can be adjusted by elongating or shortening the central shaft 22 and rotating the flange 23 to adjust the positions in the axial direction and the circumferential direction, so as to ensure that the detection template 2 is as close as possible to the repaired inner surface.

[0044] In combination with the first aspect, in some embodiments provided by the present application, one end of the detection template 2 is rotatably connected to the outlet of the port of the pressure vessel 1, and the other end is rollably connected in the groove 121 formed at the connection between the port of the pressure vessel 1 and the cylindrical shell 12. The disturbance deformation of the detection template 2 during rotation can be reduced, and the machining precision of the pressure vessel 1 can be improved. Meanwhile, the rollable connection in the groove 121 formed at the connection between the port of the pressure vessel 1 and the cylindrical shell 12 can reduce the resistance during the rotation of the detection template 2, and improve the accuracy of the measurement.

[0045] In some embodiments of the first aspect, the method for measuring the distance between the end of the detection template 2 and the bottom glue layer 11 comprises using a feeler gauge to measure the gap between the detection template 2 and the bottom glue layer 11. The gap between the detection template 2 and the bottom glue layer 11 can be accurately measured using the feeler gauge, which can improve the manufacturing accuracy of the pressure vessel 1. The gap between the detection template 2 and the bottom glue layer 11 can be 2-5 mm.

[0046] It should be noted that when the detection template 2 is installed, the flange 23 of the detection template 2 can be connected to the interface of the end of the pressure vessel 1, and the bolts are preliminarily locked. The detection template 2 is installed in a suspended position extending along the axial direction of the pressure vessel 1. The detection template 2 is adjusted to a position not interfering with the inner surface of the port of the pressure vessel 1, and is rotated by 360°. The angle of the flange 23 is adjusted according to the gap between the detection template 2 and the inner surface of the port of the pressure vessel 1, and shims are added to the position where the flange 23 has a gap with the port. Then, all the bolts are locked to complete the fastening of one end of the detection template 2. The center axis of the detection template 2 extends out of the long shaft 24 and is fixedly installed with the detection template 2, which reduces the deflection deformation of the detection template 2 when it rotates at a large angle. The support point at the other end of the detection template 2 is a rolling friction, which reduces the resistance in the rotation process of the detection template 2.

[0047] When adjusting the radial and axial positions of the detection template 2, the bolts of the radial and axial sliding blocks of the rotating detection template 2 are loosened first. The radial sliding block is adjusted to a specified position, and the mounting bolts of the radial sliding block are locked. Then, the detection template 2 is moved until the detection template 2 is tightly attached to the inner surface of the port of the pressure vessel 1, and the bolts of the axial sliding block are locked.

[0048] In some embodiments of the first aspect, as shown in Figure 3 the thickness of the heat-resistant coating layer applied on the surface of the bottom glue layer is determined according to the thickness difference of the bottom glue layer at different positions of the inner surface of the port. S401, if the gap between the detection template and the bottom glue layer is greater than the first preset thickness, a first difference value between the gap and the first preset thickness is calculated, and a heat-resistant coating layer is applied at the corresponding position. The thickness of the heat-resistant coating layer = the second preset thickness + the first difference value.

[0049] If the gap between the detection template and the bottom glue layer is greater than the first preset thickness, it indicates that the distance between the current position of the bottom glue layer and the edge of the detection template is too large, and a thicker heat-resistant coating layer is needed to make up for the distance difference at the current position. Therefore, a heat-resistant coating layer with a difference thickness is applied on the second preset thickness, so that after the heat-resistant coating layer is applied, the heat-resistant coating layers at each position form a uniform plane, improving the processing accuracy of the pressure vessel.

[0050] Specifically, the first difference thickness of the heat-resistant coating layer can be coated first, and then the second preset thickness of the heat-resistant coating layer can be coated. The first preset thickness can be 1-3 mm, and the second preset thickness can be 0.5-2 mm.

[0051] With reference to the first aspect, in some embodiments provided by the present application, the thickness of the heat-resistant coating layer coated on the surface of the primer layer is determined according to the thickness difference of the primer layer at different positions, and the method comprises the following steps: Figure 4 S402, if the gap between the detection template and the primer layer is less than the first preset thickness, a second difference between the first preset thickness and the gap between the detection template and the primer layer is calculated, and a heat-resistant coating layer is coated at the corresponding position, and the thickness of the heat-resistant coating layer = the second preset thickness-the first difference.

[0052] If the gap between the detection template and the primer layer is less than the first preset thickness, it indicates that the distance between the primer layer at the current position and the edge of the detection template is too small, and a thinner heat-resistant coating layer is needed to eliminate the distance difference at the current position. Therefore, a difference thickness of the heat-resistant coating layer is less coated on the second preset thickness, so that after the heat-resistant coating layer is coated, the heat-resistant coating layers at each position form a uniform plane, and the machining precision of the pressure vessel is improved.

[0053] It should be noted that when the detection template is measured, the gap between the detection template and the primer layer at positions spaced apart by a certain distance, for example, 10-50 mm, on the circumferential direction of the inner surface of the port of the pressure vessel 1, is usually measured and marked, and the heat-resistant coating layer is coated more or less according to the measurement results. When the heat-resistant coating layer is coated, the thickness of each scraping is 0.5-1 mm, and the scraping is performed multiple times.

[0054] With reference to the first aspect, in some embodiments provided by the present application, the heat-resistant coating layer comprises silicone rubber, so that the heat-resistant coating layer can be cured at room temperature, and the heat protection performance is reliable.

[0055] With reference to the first aspect, in some embodiments provided by the present application, the Shore hardness of the heat-resistant coating layer is A60-A80, and the hardness of the heat-resistant coating layer in this range can make the heat-resistant coating layer completely vulcanized, and ensure the heat protection performance.

[0056] It should be noted that the curing time of the heat-resistant coating layer after coating is greater than or equal to 24 h, so as to improve the strength of the heat-resistant coating layer.

[0057] ​In the description of the specification, the description of the terms "one embodiment / way", "some embodiments / ways", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments / ways or examples. In addition, the person skilled in the art can combine and combine the different embodiments / ways or examples described in the specification and the features of the different embodiments / ways or examples, without contradiction.

[0058] It should be noted that in the present application, the relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element. In the present application, the meaning of "a plurality of" is at least two, for example two, three, etc., unless otherwise explicitly specified.

[0059] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method of repairing the interior surface of a pressure vessel, characterized by, The method comprises the following steps: polishing the inner surface of the port of the pressure vessel; applying a primer layer on the polished inner surface of the port, curing, and polishing; obtaining the thickness of the primer layer at different positions of the inner surface of the port; determining the thickness of the heat-proof coating layer applied on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port.

2. The method of repairing the interior surface of a pressure vessel as defined in claim 1, wherein, When the inner surface of the port of the pressure vessel is polished, the roughness of the polished inner surface of the port is 5-15 μm.

3. The method of repairing the interior surface of a pressure vessel as defined in claim 1, wherein, When the primer layer is applied on the polished inner surface of the port, cured, and polished: the material of the primer layer comprises silicone rubber; and / or, the Shore hardness of the cured primer layer is A20-A50; and / or, the curing time of the primer layer is 24-48 h; and / or, the surface roughness of the polished primer layer is 5-15 μm.

4. The method of repairing the interior surface of a pressure vessel of claim 1 wherein, In the step of obtaining the thickness of the primer layer at different positions of the inner surface of the port, the method for obtaining the distance comprises: setting a detection template rotatable along the circumferential side of the port of the pressure vessel according to the shape of the port of the pressure vessel, and obtaining the thickness of the primer layer at different positions of the inner surface of the port according to the distance between the end head of the detection template and the primer layer.

5. The method of repairing the interior surface of a pressure vessel as defined in claim 4, wherein, The detection template can be fixed on the central axis of the port of the pressure vessel, and the position in the axial direction and the circumferential direction is adjustable.

6. The method of repairing the interior surface of a pressure vessel as defined in claim 4, wherein, One end of the detection template is rotationally connected to the outlet of the port of the pressure vessel, and the other end is rollingly connected to the groove formed at the connection between the port of the pressure vessel and the cylindrical shell.

7. The method of repairing the interior surface of a pressure vessel as defined in claim 4, wherein, The method for measuring the distance between the end head of the detection template and the primer layer comprises measuring the gap between the detection template and the primer layer by using a plug gauge.

8. The method of repairing the interior surface of a pressure vessel as defined in claim 1, wherein, The method for determining the thickness of the heat-proof coating layer applied on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port comprises: if the gap between the detection template and the primer layer is greater than a first preset thickness, calculating a first difference value between the gap between the detection template and the primer layer and the first preset thickness, applying the heat-proof coating layer at the corresponding position, and the thickness of the heat-proof coating layer = a second preset thickness + the first difference value.

9. The method of repairing the interior surface of a pressure vessel as defined in claim 1, wherein, The method for determining the thickness of the heat-proof coating layer applied on the surface of the primer layer according to the thickness difference of the primer layer at different positions of the inner surface of the port comprises: if the gap between the detection template and the primer layer is less than a first preset thickness, calculating a second difference value between the first preset thickness and the gap between the detection template and the primer layer, applying the heat-proof coating layer at the corresponding position, and the thickness of the heat-proof coating layer = the second preset thickness - the first difference value.

10. The method of repairing the interior surface of a pressure vessel as defined in claim 1, wherein, The heat-proof coating material comprises at least one of silicone rubber; and / or, the Shore hardness of the heat-proof coating layer is A60-A80.

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