Method for measuring deformation of special-shaped metal corrugated pipe after installation

Abstract

The invention provides a method for measuring the deformation of a special-shaped metal corrugated pipe after installation, which comprises the following steps of: measuring the offset between a standard tool and a working inlet flange before and after the corrugated pipe is installed through a feeler gauge, obtaining delta L0 after the difference, and obtaining the variable quantity delta LA of the distance between an outlet flange of an equivalent bent pipe and a central shaft of the corrugated pipe; by making an extension line of a measuring line on a working outlet flange, the offset delta L1 between the measuring line on the working inlet flange and the variable quantity delta LB of the distance between the equivalent working inlet flange and the central axis of the bent pipe are obtained, and two groups of eight measured values are obtained by measuring the distance between the flanges at the two ends of the working corrugated pipe and the total length of the corrugated pipe; and respectively subtracting the original values and averaging to obtain delta LC and delta LD, thereby realizing effective measurement of the deformation state of the installed special-shaped metal corrugated pipe. According to the method, the measurement process is simplified, the measurement difficulty and the rectification risk are reduced, the construction efficiency is improved, the operation steps are simple, and the installation difficulty of the corrugated pipe is reduced, so that the labor intensity of constructors is reduced, and the construction safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of installation of ship piping systems, and in particular to a method for measuring the deformation of a special-shaped metal bellows after installation. Background Art

[0002] Special-shaped metal bellows are mainly used in high-temperature and high-pressure systems to connect key equipment such as pumps, compressors, turbines and steam turbines, compensate for axial and lateral combined displacement, isolate equipment vibration, and meet the force requirements of equipment pipe openings. Special-shaped metal bellows have a compact structure, strong comprehensive compensation and vibration reduction capabilities, good pressure resistance, and good impact resistance. Control of its deformation state before and after system installation is a key factor in achieving the above performance.

[0003] The technical requirements for deformation of special-shaped metal bellows after installation are as follows: the distance from the outer surface of the elbow outlet flange to the central axis of the working inlet flange is LA. Compared with the original measured size, the change value of LA is ΔLA≤1mm, and the distance from the outer surface of the working inlet flange to the central axis of the elbow outlet flange is LB. Compared with the original measured size, the change value of LB is ΔLB≤2mm. After the installation of the special-shaped metal bellows, the central axis of the working inlet flange and the central axis of the elbow outlet flange are both virtual line segments, which do not meet the measurement conditions and cannot determine the deformation state of the special-shaped metal bellows after installation, resulting in the inability to fully guarantee its installation quality and performance.

[0004] Therefore, after the installation of special-shaped metal bellows is completed, how to effectively measure its deformation state to ensure its installation quality and performance has become an urgent problem to be solved. Summary of the invention

[0005] In order to ensure that the deformation state of the special-shaped metal bellows can be effectively measured after installation, the present invention proposes a method for measuring the deformation of the special-shaped metal bellows after installation. The method solves the technical problem that the deformation state of the special-shaped metal bellows cannot be effectively measured after installation through equivalent transformation and mean value measurement of measurement parameters.

[0006] The solution adopted by the present invention to solve the technical problem is: A method for measuring the deformation of a special-shaped metal bellows after installation, comprising the following steps: Step 1. The working bellows is connected to the balancing bellows and the elbow through a tee joint to form a Y-shaped structure, and flanges are provided at each interface for connection; Step 2. Before installing the special-shaped metal bellows, mark four measuring lines on the outer walls of the working inlet flange, the working outlet flange and the balancing outlet flange. The interval between every two measuring lines is 90°, and the measuring lines on each flange are aligned with each other and set on the same horizontal line; Step 3. Bring the standard tooling close to and close to the upper outer wall of the working inlet flange and the working outlet flange, use a feeler gauge to measure the offset between the standard tooling and the working inlet flange, and record it as the original value L0; measure the distance between the outer end face of the working inlet flange and the outer end face of the working outlet flange, which is defined as the distance between the flanges at both ends of the working bellows, and record the original value as LC; measure the distance between the outer end face of the working inlet flange and the outer end face of the balancing outlet flange, which is defined as the total length of the bellows, and record the original value as LD; Step 4. Install the special-shaped metal bellows according to the technical requirements, requiring that the change in the distance between the outlet flange of the elbow and the central axis of the bellows ΔLA≤1mm, and the change in the distance between the working inlet flange and the central axis of the elbow ΔLB≤2mm; Step 5. After the special-shaped metal bellows is installed, the standard tool is brought close to and closely attached to the upper outer wall of the working inlet flange and the working outlet flange, and the feeler gauge is used to measure the offset between the standard tool and the working inlet flange again, and the offset is recorded as the measured value L0′. The measured value L0′ is subtracted from the original value L0 to obtain ΔL0, and ΔL0 is required to be ≤1mm, which is equivalent to ΔLA ≤1mm; Step 6. After the special-shaped metal bellows is installed, an extension line is made to the working inlet flange based on the measuring line on the working outlet flange. The offset between the extension line and the measuring line on the working inlet flange is ΔL1, and ΔL1 is required to be ≤1mm, which is equivalent to ΔLB≤2mm; Step 7. Four measuring points corresponding to the four measuring lines are evenly distributed circumferentially on the outer end surfaces of the working inlet flange and the working outlet flange, and the distances between them are measured in pairs, and recorded as LC1, LC2, LC3, and LC4; four measuring points corresponding to the four measuring lines are evenly distributed circumferentially on the outer end surfaces of the working inlet flange and the balancing outlet flange, and the points of the working inlet flange are consistent with those when measuring LC, and the distances between them are measured in pairs, and recorded as LD1, LD2, LD3, and LD4; Step 8. Subtract the measured values ​​LC1, LC2, LC3, and LC4 of the flange distance at both ends of the working bellows from the original value LC and take the average value to obtain ΔLC, and ΔLC is required to be ≤1mm; subtract the measured values ​​LD1, LD2, LD3, and LD4 of the total length of the bellows from the original value LD and take the average value to obtain ΔLD, and ΔLD is required to be ≤1mm.

[0007] Positive effects: The present invention measures the offset between the standard tooling and the working inlet flange before and after the installation of the special-shaped metal bellows by a feeler gauge, and obtains ΔL0 after subtraction, and the change ΔLA of the distance between the equivalent elbow outlet flange and the central axis of the bellows. By extending the measuring line on the working outlet flange, the offset ΔL1 between the measuring line on the working inlet flange and the change ΔLB of the distance between the equivalent working inlet flange and the central axis of the elbow are obtained. By measuring the flange spacing at both ends of the working bellows and the total length of the bellows, two groups of eight measurement values ​​are obtained, and ΔLC and ΔLD are obtained by subtracting them from the original values ​​and taking the average value, so as to achieve effective measurement of the deformation state of the special-shaped metal bellows after installation. This method simplifies the measurement process, reduces the measurement difficulty and rectification risk, and improves the overall construction efficiency. In addition, the operation steps of this method are simple and clear, which greatly reduces the difficulty of installation and control of the special-shaped metal bellows, thereby reducing the labor intensity of construction personnel and improving construction safety. It is suitable for use as a deformation measurement method for special-shaped metal bellows after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the technical requirements for deformation of the special-shaped metal bellows after installation in this application; Figure 2 This is a schematic diagram of the deformation measurement process method for the special-shaped metal bellows after installation in this application.

[0009] In the figure, 1. Working bellows, 2. Balancing bellows, 3. Elbow, 4. Tee joint, 5. Working inlet flange, 6. Working outlet flange, 7. Balancing outlet flange, 8. Elbow outlet flange, 9. Standard tooling, 10. Feeler gauge; ΔL0: horizontal offset of the working bellows; ΔL1: torsional offset of the working inlet flange; LA: The distance between the elbow outlet flange and the central axis of the bellows; LB: the distance between the working inlet flange and the center axis of the elbow; LC: The distance between the flanges at both ends of the working bellows; LD: total length of bellows. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0011] As shown in the figure, a method for measuring the deformation of a special-shaped metal bellows after installation includes the following steps: Step 1. The working bellows 1 is connected to the balancing bellows 2 and the elbow 3 through a tee joint 4 to form a Y-shaped structure, and flanges are provided at each interface for connection; Step 2. Before installing the special-shaped metal bellows, mark four measuring lines on the outer walls of the working inlet flange 5, the working outlet flange 6 and the balancing outlet flange 7, with every two measuring lines arranged at 90° intervals, and the measuring lines on each flange are aligned with each other and set on the same horizontal line; Step 3. Bring the standard tool 9 close to and close to the upper outer wall of the working inlet flange 5 and the working outlet flange 6, use the feeler gauge 10 to measure the offset between the standard tool 9 and the working inlet flange 5, and record it as the original value L0; measure the distance between the outer end face of the working inlet flange 5 and the outer end face of the working outlet flange 6, which is defined as the distance between the flanges at both ends of the working bellows, and record the original value as LC; measure the distance between the outer end face of the working inlet flange 5 and the outer end face of the balancing outlet flange 7, which is defined as the total length of the bellows, and record the original value as LD; Step 4. Install the special-shaped metal bellows according to the technical requirements, requiring that the change in the distance between the elbow outlet flange 8 and the central axis of the bellows ΔLA≤1mm, and the change in the distance between the working inlet flange 5 and the central axis of the elbow 3 ΔLB≤2mm; Step 5. After the special-shaped metal bellows is installed, the standard tool 9 is brought close to and closely attached to the upper outer walls of the working inlet flange 5 and the working outlet flange 6, and the feeler gauge 10 is used to measure the offset between the standard tool 9 and the working inlet flange 5 again, and recorded as the measured value L0′. The measured value L0′ is subtracted from the original value L0 to obtain ΔL0, and ΔL0 is required to be ≤1mm, which is equivalent to ΔLA ≤1mm; Step 6. After the special-shaped metal bellows is installed, an extension line is made to the working inlet flange 5 based on the measurement line on the working outlet flange 6. The offset between the extension line and the measurement line on the working inlet flange 5 is ΔL1, and ΔL1 is required to be ≤1mm, which is equivalent to ΔLB≤2mm; Step 7. Four measuring points corresponding to the four measuring lines are evenly distributed circumferentially on the outer end surfaces of the working inlet flange 5 and the working outlet flange 6, and the distances therebetween are measured in pairs, and recorded as LC1, LC2, LC3, and LC4; four measuring points corresponding to the four measuring lines are evenly distributed circumferentially on the outer end surfaces of the working inlet flange 5 and the balancing outlet flange 7, and the points of the working inlet flange 5 are consistent with those when measuring LC, and the distances therebetween are measured in pairs, and recorded as LD1, LD2, LD3, and LD4; Step 8. Subtract the measured values ​​LC1, LC2, LC3, and LC4 of the flange distance at both ends of the working bellows from the original value LC and take the average value to obtain ΔLC, and ΔLC is required to be ≤1mm; subtract the measured values ​​LD1, LD2, LD3, and LD4 of the total length of the bellows from the original value LD and take the average value to obtain ΔLD, and ΔLD is required to be ≤1mm.

[0012] Features of the present invention: During the actual use of the present invention, the offset between the standard tooling 9 and the working inlet flange 5 before and after the installation of the special-shaped metal bellows is measured by a feeler gauge 10, and ΔL0 is obtained after subtraction, and the change in the distance between the equivalent elbow outlet flange 8 and the central axis of the bellows ΔLA is obtained. By extending the measuring line on the working outlet flange 6, the offset ΔL1 between the measuring line on the working inlet flange 5 and the change in the distance between the equivalent working inlet flange 5 and the central axis of the elbow 3 ΔLB is obtained. By measuring the flange spacing at both ends of the working bellows and the total length of the bellows, two groups of eight measurement values ​​are obtained, and ΔLC and ΔLD are obtained by subtracting them from the original values ​​and taking the average value, so as to achieve effective measurement of the deformation state of the special-shaped metal bellows after installation. Through this technical solution, the measurement process can be simplified, the measurement difficulty and rectification risk can be reduced, and the overall construction efficiency can be improved. In addition, the operation steps of this method are simple and clear, which greatly reduces the difficulty of installation and control of special-shaped metal bellows, thereby reducing the labor intensity of construction personnel and improving construction safety.

[0013] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring the deformation of a special-shaped metal bellows after installation, characterized in that: The following steps are involved: Step 1. The working bellows (1) is connected to the balancing bellows (2) and the elbow (3) through a three-way joint (4) to form a Y-shaped structure, and flanges are provided at each interface for connection; Step 2. Before installing the special-shaped metal bellows, mark four measuring lines on the outer walls of the working inlet flange (5), the working outlet flange (6) and the balancing outlet flange (7), with every two measuring lines arranged at a 90° interval, and the measuring lines on each flange are aligned with each other and set on a uniform horizontal line; Step 3. Place the standard tool (9) close to and in close contact with the upper outer walls of the working inlet flange (5) and the working outlet flange (6), use a feeler gauge (10) to measure the offset between the standard tool (9) and the working inlet flange (5), and record it as the original value L0; measure the distance between the outer end face of the working inlet flange (5) and the outer end face of the working outlet flange (6), which is defined as the distance between the flanges at both ends of the working bellows, and record it as the original value LC; measure the distance between the outer end face of the working inlet flange (5) and the outer end face of the balancing outlet flange (7), which is defined as the total length of the bellows, and record it as the original value LD; Step 4. Install the special-shaped metal bellows according to the technical requirements, requiring that the change in the distance between the outlet flange (8) of the elbow and the central axis of the bellows ΔLA≤1mm, and the change in the distance between the working inlet flange (5) and the central axis of the elbow (3) ΔLB≤2mm; Step 5. After the special-shaped metal bellows is installed, the standard tool (9) is brought close to and tightly attached to the upper outer walls of the working inlet flange (5) and the working outlet flange (6), and the feeler gauge (10) is used to measure the offset between the standard tool (9) and the working inlet flange (5) again, and the offset is recorded as the measured value L0′. The measured value L0′ is subtracted from the original value L0 to obtain ΔL0, and ΔL0 is required to be ≤1 mm, which is equivalent to ΔLA ≤1 mm; Step 6. After the special-shaped metal bellows is installed, an extension line is made to the working inlet flange (5) based on the measuring line on the working outlet flange (6). The offset between the extension line and the measuring line on the working inlet flange (5) is ΔL1, and ΔL1 is required to be ≤1mm, which is equivalent to ΔLB≤2mm; Step 7. Four measuring points corresponding to the four measuring lines are evenly distributed on the outer end surfaces of the working inlet flange (5) and the working outlet flange (6), and the distances between them are measured in pairs, and recorded as LC1, LC2, LC3, and LC4; four measuring points corresponding to the four measuring lines are evenly distributed on the outer end surfaces of the working inlet flange (5) and the balancing outlet flange (7), and the points of the working inlet flange (5) are consistent with those when measuring LC, and the distances between them are measured in pairs, and recorded as LD1, LD2, LD3, and LD4; Step 8. Subtract the measured values ​​LC1, LC2, LC3, and LC4 of the flange distance at both ends of the working bellows from the original value LC and take the average value to obtain ΔLC, and ΔLC is required to be ≤1mm; subtract the measured values ​​LD1, LD2, LD3, and LD4 of the total length of the bellows from the original value LD and take the average value to obtain ΔLD, and ΔLD is required to be ≤1mm.

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