Sliding support friction pair structure of large-pipe-diameter steam pipeline
By using a stainless steel plate sliding substructure connected by argon arc welding in a large-pipe steam pipe sliding bracket, the problem of twisting and deformation of the polytetrafluoroethylene plate under high load is solved, and the long-term efficient operation and reliability of the sliding bracket is achieved.
Patent Information
- Application Number
- CN202422238321.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-12
AI Technical Summary
During the debugging and operation stage, the PTFE plate of the large pipe diameter steam pipe sliding bracket is twisted and convex and deformation due to large basic load, large displacement load, and large axial and radial thermal displacement, which affects the normal sliding of the bracket, and problems still occur after replacing the same material board.
The mirrored mirror on the sliding pair and the mirrored mirrored pair of friction pair are used to replace the polytetrafluoroethylene plate, and the friction pair structure of the sliding bracket is formed through argon arc welding connection to ensure that the stainless steel plate does not twist and deform under high temperature and load, and the firmness is improved through spot welding connection.
The sliding substructure of the mirror stainless steel plate does not deform under high temperature and load, has a low friction coefficient, reduces friction, ensures long-term and efficient operation of the sliding bracket, and the welding strength is higher than that of rivets or adhesive fixation, improving reliability and service life.
Smart Images
Figure CN223215895U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of thermal pipeline supports in nuclear power plants, and particularly relates to a friction pair structure of a sliding support for a large-diameter steam pipeline. Background Art
[0002] A steam energy project installed two 900mm nominal diameter steam pipes overhead outdoors. The original design used polytetrafluoroethylene (PTFE) sheets for the sliding and friction pairs of the sliding supports. The PTFE sheets were fixed to the upper and lower steel plates of the sliding supports with rivets. During commissioning, it was discovered that the PTFE sheets of the sliding supports were twisting and bulging due to high base loads, displacement loads, and axial and radial thermal displacements. This abnormal deformation compromised the sliding function of the sliding supports, causing friction forces far exceeding the design value, directly impacting the safe operation of the thermal pipelines. The damaged PTFE sheets were replaced with the same material, but the same problem recurred after operation. Utility Model Content
[0003] The purpose of the utility model is to provide a friction pair structure of a sliding bracket for a large-diameter steam pipeline, which solves the problem that the normal sliding of the bracket is affected by the distortion and convex deformation of the polytetrafluoroethylene plate of the sliding bracket due to large basic load, large displacement load, and large axial and radial thermal displacement during the commissioning operation stage.
[0004] The technical solution adopted by the utility model to solve its technical problems is: a large-diameter steam pipeline sliding bracket friction pair structure, wherein the sliding bracket friction pair includes: a sliding pair upper mirror stainless steel plate and a friction pair lower mirror stainless steel plate; the sliding pair upper mirror stainless steel plate is located below the sliding bracket pipe seat upper steel plate, and the sliding pair upper mirror stainless steel plate and the pipe seat upper steel plate are adhered and spot-welded; the friction pair lower mirror stainless steel plate is located below the sliding pair upper mirror stainless steel plate, and slides between the two; the sliding bracket pipe seat lower steel plate is located below the friction pair lower mirror stainless steel plate, adhered and spot-welded thereto; the concrete pier embedded steel plate is located below the pipe seat lower steel plate.
[0005] In the above-mentioned large-diameter steam pipe sliding bracket friction pair structure, the length and width of the mirror stainless steel plate on the sliding pair are 5-15mm larger than the length and width of the steel plate on the pipe seat, and the size of the mirror stainless steel plate under the friction pair is consistent with the size of the steel plate under the pipe seat.
[0006] In the above-mentioned large-diameter steam pipe sliding bracket friction pair structure, the thickness of the mirror stainless steel plate on the sliding pair and the mirror stainless steel plate on the friction pair are consistent with the original polytetrafluoroethylene plate on the sliding pair and the polytetrafluoroethylene plate on the friction pair.
[0007] In the above-mentioned large-diameter steam pipeline sliding bracket friction pair structure, the mirror-finished stainless steel plate on the sliding pair and the mirror-finished stainless steel plate on the friction pair are both made of 06Cr19Ni10 stainless steel.
[0008] The above-mentioned large-diameter steam pipe sliding bracket friction pair structure, wherein the mirror stainless steel plate on the sliding pair is spot-welded to the upper steel plate on the pipe seat by argon arc welding fillet welds, and the mirror stainless steel plate on the friction pair is spot-welded to the lower steel plate on the pipe seat by side welds, and the welding strength meets the requirement of being greater than 0.1 times the structural load.
[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a large-diameter steam pipe sliding bracket friction pair structure, and uses mirror stainless steel plate sliding bracket sliding pairs and friction pairs to replace the polytetrafluoroethylene plate sliding bracket sliding pairs and friction pairs that are twisted and convexly deformed during the commissioning and operation stage. The mirror stainless steel plates will not be twisted or convexly deformed under the influence of pipeline medium temperature, natural environment, displacement load, etc., and can effectively ensure a low friction coefficient of the sliding contact surface; the mirror stainless steel plates have a longer reliable service life than the polytetrafluoroethylene plates, and can enable the pipeline system to operate efficiently for a long time; the friction coefficient between the mirror stainless steel plates is smaller than the friction coefficient between the polytetrafluoroethylene plates, which reduces the lateral bending shear force on the sliding load-bearing bracket generated by friction, and the sliding bracket bears less thrust; the mirror stainless steel plates connected by argon arc spot welding are more firm and reliable than the polytetrafluoroethylene plates fixed by rivets or glue. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 The figure shows the radial cross-sectional structure diagram of the friction pair of the improved front sliding bracket of the utility model;
[0011] Figure 2 The figure shows the radial cross-sectional structure diagram of the friction pair of the improved sliding bracket of the present invention;
[0012] Figure 3 The figure shows the axial cross-section of the friction pair of the improved front sliding bracket of the utility model;
[0013] Figure 4 Shown is a schematic axial cross-sectional view of the friction pair of the improved sliding bracket of the present invention.
[0014] Explanation of the reference numbers in the accompanying drawings: 1. Left hydraulic jack; 2. Right hydraulic jack; 3. Steel plate on the pipe seat; 4. Mirror-finished stainless steel plate on the sliding pair; 5. Spot-welded connection of argon arc fillet welds; 6. Mirror-finished stainless steel plate under the friction pair; 7. Steel plate under the pipe seat; 8. Spot-welded connection of argon arc side welds; 9. Polytetrafluoroethylene plate on the sliding pair; 10. Polytetrafluoroethylene plate under the friction pair; 11. Embedded steel plate for concrete piers. DETAILED DESCRIPTION
[0015] In order to solve the problem that the sliding pair and friction pair of the polytetrafluoroethylene plate of a large-diameter steam pipeline sliding bracket are twisted and convexly deformed during the debugging and operation stage, which affects the normal sliding of the bracket, the utility model provides a friction pair structure of a large-diameter steam pipeline sliding bracket.
[0016] like Figure 2 、 Figure 4 As shown, the friction pair of the sliding support for a large-diameter steam pipeline comprises an upper mirror-finished stainless steel plate 4 and a lower mirror-finished stainless steel plate 6. The upper mirror-finished stainless steel plate 4 is located below the upper steel plate 3 of the sliding support pipe seat, tightly fitting and spot-welded to the upper steel plate 3. The lower mirror-finished stainless steel plate 6 is located below the upper mirror-finished stainless steel plate 4. The lower steel plate 7 of the sliding support pipe seat is located below the lower mirror-finished stainless steel plate 6, tightly fitting and spot-welded to the upper steel plate 3. A pre-embedded steel plate 11 in the concrete pier is located below the lower steel plate 7. The upper mirror-finished stainless steel plate 4 and the lower mirror-finished stainless steel plate 6 are made of 06Cr19Ni10. The friction coefficient between the upper mirror-finished stainless steel plate 4 and the lower mirror-finished stainless steel plate 6 is lower than that between polytetrafluoroethylene plates, effectively ensuring that the thrust of the sliding support meets design requirements. Furthermore, the mirror-finished stainless steel plates will not twist or bulge under the influence of pipeline medium temperature, natural environment, displacement load, and other factors.
[0017] In order to control the deformation of the mirror stainless steel plate during the welding process, argon arc welding is used as the welding process. The mirror stainless steel plate 4 on the sliding pair is tightly fitted with the steel plate 3 on the pipe seat and is spot-welded 5 with argon arc welding fillet welds. The mirror stainless steel plate 6 on the friction pair is tightly fitted with the steel plate 7 on the pipe seat and is spot-welded 8 with argon arc welding side welds. The welding strength is greater than 0.1 times the structural load. The fixing method through welding is more firm and reliable than the fixing method of the original polytetrafluoroethylene plate 9 on the sliding pair and the polytetrafluoroethylene plate 10 on the friction pair connected by rivets or adhesives, which can realize long-term and efficient operation of the pipeline system.
[0018] To ensure that the on-site pipeline installation elevation remains unchanged, the mirror-finished stainless steel plate 4 on the sliding pair and the mirror-finished stainless steel plate 6 on the friction pair are of the same thickness as the original polytetrafluoroethylene plate 9 on the sliding pair and the polytetrafluoroethylene plate 10 on the friction pair. The length and width of the mirror-finished stainless steel plate 4 on the sliding pair are 5-15 mm larger than those of the pipe seat upper steel plate 3. Preferably, the length and width of the mirror-finished stainless steel plate 4 on the sliding pair are 10 mm larger than those of the pipe seat upper steel plate 3. The dimensions of the mirror-finished stainless steel plate 6 on the friction pair are consistent with those of the pipe seat lower steel plate 7.
[0019] like Figures 1-4As shown, replacing the twisted, bulging, and deformed sliding and friction pairs of the large-diameter steam pipe sliding bracket polytetrafluoroethylene plates during the commissioning phase with improved large-diameter steam pipe sliding bracket friction pairs primarily involves the following steps: First, a hydraulic jack is installed on each side of the sliding bracket to be replaced, preferably about one meter apart. Since the thermal pipeline has a certain degree of flexibility, the left and right hydraulic jacks 1 and 2 are operated simultaneously to slightly lift the pipeline to a height sufficient to remove the upper polytetrafluoroethylene plate 9 of the sliding pair and the lower polytetrafluoroethylene plate 10 of the friction pair. After removing the upper polytetrafluoroethylene plate 9 of the sliding pair and the lower polytetrafluoroethylene plate 10 of the friction pair, clean the upper and lower steel plates 3 and 7 of the pipe seat.
[0020] Insert the mirror-finished stainless steel plate 4 on the sliding pair and the mirror-finished stainless steel plate 6 on the friction pair between the upper steel plate 3 and the lower steel plate 7 of the pipe seat in sequence for trial assembly. Adjust the mirror-finished stainless steel plate 4 on the sliding pair and the upper steel plate 3 on the pipe seat, and the mirror-finished stainless steel plate 6 on the friction pair and the lower steel plate 7 on the pipe seat to fit. Simultaneously operate the left hydraulic jack 1 and the right hydraulic jack 2 to drop the pipe. Check the fit of the mirror-finished stainless steel plate and the upper bottom steel plate of the pipe seat and adjust them until they fit tightly. After passing the inspection, weld the upper and lower mirror-finished stainless steel plates to the upper and lower bottom steel plates of the pipe seat. The entire process requires that the surfaces of the mirror-finished stainless steel plate 4 on the sliding pair and the mirror-finished stainless steel plate 6 on the friction pair be clean, free of dust particles, and free of scratches.
[0021] During the welding process, to avoid burns, thermal adhesion, and welding deformation during the mirror stainless steel plate welding process, before welding the mirror stainless steel plate 4 on the sliding pair, the left hydraulic jack 1 and the right hydraulic jack 2 are operated to slightly lift the pipeline and pull out the lower mirror stainless steel plate 6. A simulated stainless steel plate of the same material, specifications, and size as the mirror stainless steel plate 6 on the friction pair is inserted. The left hydraulic jack 1 and the right hydraulic jack 2 are then lowered. The mirror stainless steel plate 4 on the sliding pair is spot welded to the upper steel plate 3 on the pipe seat with an argon arc weld fillet weld 5. After the connection is completed, the left hydraulic jack 1 and the right hydraulic jack 2 are operated to slightly lift the pipeline. After pulling out the simulated stainless steel plate, the mirror stainless steel plate 6 on the friction pair is inserted into the installation position. After checking that everything is correct, the left hydraulic jack 1 and the right hydraulic jack 2 are simultaneously lowered to complete the spot welding connection between the mirror stainless steel plate 6 on the friction pair and the lower steel plate 7 on the pipe seat. Finally, the left hydraulic jack 1 and the right hydraulic jack 2 are removed and the site is cleaned up to complete the replacement of the sliding bracket friction pair.
[0022] It should be noted that the combination of the various technical features in the embodiments of the present invention is not limited to the combination described in the embodiments of the present invention or the combination described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way unless there is a contradiction between them.
[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A friction pair structure of a sliding bracket for a large-diameter steam pipe, characterized in that: The sliding bracket friction pair comprises: a sliding pair upper mirror stainless steel plate (4) and a friction pair lower mirror stainless steel plate (6); the sliding pair upper mirror stainless steel plate (4) is located below the sliding bracket pipe seat upper steel plate (3), the sliding pair upper mirror stainless steel plate (4) and the pipe seat upper steel plate (3) are attached and connected by spot welding; the friction pair lower mirror stainless steel plate (6) is located below the sliding pair upper mirror stainless steel plate (4), and the two slide between them; the sliding bracket pipe seat lower steel plate (7) is located below the friction pair lower mirror stainless steel plate (6), attached and connected by spot welding; the concrete pier embedded steel plate (11) is located below the pipe seat lower steel plate (7).
2. According to the friction pair structure of a sliding bracket for a large-diameter steam pipe as described in claim 1, the length and width of the mirror-finished stainless steel plate (4) on the sliding pair are 5-15 mm larger than the length and width of the steel plate (3) on the pipe seat, and the size of the mirror-finished stainless steel plate (6) under the friction pair is consistent with the size of the steel plate (7) under the pipe seat.
3. The large diameter steam pipe sliding bracket friction pair structure according to claim 1, characterized in that: The thickness of the mirror stainless steel plate (4) on the sliding pair and the mirror stainless steel plate (6) on the friction pair are consistent with the thickness of the original polytetrafluoroethylene plate (9) on the sliding pair and the polytetrafluoroethylene plate (10) on the friction pair.
4. The large diameter steam pipe sliding bracket friction pair structure according to claim 1, characterized in that: The mirror stainless steel plate (4) on the sliding pair and the mirror stainless steel plate (6) on the friction pair are both made of 06Cr. 19 Ni 10 Stainless steel.
5. The large diameter steam pipe sliding bracket friction pair structure according to claim 1, characterized in that: The mirror-finished stainless steel plate (4) on the sliding pair is connected to the upper steel plate (3) on the tube seat by argon arc welding corner spot welding (5), and the mirror-finished stainless steel plate (6) on the friction pair is connected to the lower steel plate (7) on the tube seat by side spot welding (8), and the welding strength meets the requirement of being greater than 0.1 times the structural load.