Double-layer hoop pipe clamp
By using double-layer hoop tube clamps, using split structure and titanium cobalt alloy material, the leakage problem in the boiler is solved due to thermal stress, and stable and long-life tube clamp fixation under high temperature conditions is achieved.
Patent Information
- Application Number
- CN202421389584.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2035-03-21
AI Technical Summary
Under the combined action of residual welding stress, structural stress and thermal stress during the later boiler operation, cracks are prone to invasion in weak areas, which will then expand and cause leakage problems.
A double-layer hoop tube clamp is adopted, including an upper tube clamp and a lower tube clamp. Through holes and fastening bolts are provided on both sides, and arcuate grooves are provided on the inner side to form a cavity structure to fix the reheater tube. There is a 2 mm gap between the upper tube clamp and the lower tube clamp. Titanium-cobalt alloy material is used to ensure good mechanical properties under high temperature conditions.
Through the use of split tube clamp structure and high-strength high-temperature resistant materials, local wear and misalignment with the clamped pipe can be effectively alleviated or avoided, prevented tube screen deformation, prolonged service life, and maintained good mechanical properties under working conditions of 1300℃.
Smart Images
Figure CN222977590U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hoop pipe clamps, and particularly relates to a double-layer hoop pipe clamp. Background Art
[0002] The reheater is essentially a superheater that reheats the low-pressure steam that has done work and reaches a certain temperature. The function of the reheater further improves the thermal efficiency of the power plant cycle and controls the steam temperature of the last-stage blades of the steam turbine within the allowable range. The reheater is a heater in the boiler that heats the water vapor coming out of the steam turbine into superheated steam.
[0003] Moreover, the thermal expansion of stainless steel material is relatively large. During operation, the temperature fluctuations of the medium in adjacent pipes and the temperature difference between the medium in the pipe and the flat steel will form an expansion difference, resulting in large thermal stress. The lower the unit load, the greater the temperature difference between the pipes. Under the combined action of welding residual stress, structural stress and thermal stress during the later operation of the boiler, cracks initiate in the weak areas and then expand to cause leakage. The nearby reheater pipes are eroded and thinned by it, unable to withstand the pressure of the medium in the pipe and then leaking. After the high-pressure reheater pipes leak, they erode each other, and finally cause large-area leakage. Content of the Utility Model
[0004] Technical Problem to be Solved
[0005] Aiming at the above-mentioned disadvantages of the prior art, the utility model provides a double-layer hoop pipe clamp, which can effectively solve the problem that cracks initiate in the weak areas and then expand to cause leakage under the combined action of welding residual stress, structural stress and thermal stress during the later operation of the boiler in the prior art.
[0006] Technical Solution
[0007] To achieve the above object, the utility model is realized through the following technical solutions:
[0008] The utility model provides a double-layer hoop pipe clamp, including an upper pipe clamp and a lower pipe clamp. Through holes are opened on both sides of the upper pipe clamp and the lower pipe clamp, and fastening bolts are arranged in the through holes. A nut is sleeved on one side of the fastening bolt. Arc-shaped grooves are inwardly opened on the inner sides of the upper pipe clamp and the lower pipe clamp, and the two groups of arc-shaped grooves form a cavity structure, in which a reheater pipe is fixed.
[0009] Further, there is a 2-mm gap between the upper pipe clamp and the lower pipe clamp brackets.
[0010] Further, both the upper pipe clamp and the lower pipe clamp are made of a selected titanium-cobalt alloy TiC-9ALC-5USCBN material.
[0011] Further, multiple groups of reheater tubes are arranged within the upper pipe clamp and the lower pipe clamp, and a spacing of 20 centimeters is maintained between each group of reheater tubes.
[0012] Further, circular hole structures are provided on one side of each group of arc-shaped grooves of the upper pipe clamp and the lower pipe clamp, and a combined structure of fastening bolts and nuts is arranged within the circular holes.
[0013] Further, the distance between each group of upper pipe clamps is at least 2 meters.
[0014] Beneficial Effects
[0015] The technical solution provided by the present utility model has the following beneficial effects compared with the known public technology:
[0016] 1. In the present utility model, the pipe clamp structure is split-type. During installation, the two halves are buckled together and connected by fastening bolts in the middle. The pipe clamp can be integrally precision-cast using silica sol during production, with high tissue density, excellent mechanical properties, and a service life of more than 6 years.
[0017] 2. In the reheater pipe clamp of the present device, each group of pipe clamps includes two clip pieces. The inner wall of the clip piece is arc-shaped and fits the outer peripheral surface of the reheater and the reheater pipe wall. The adjacent clip pieces on the same side are connected end to end and integrally formed, and screw holes are provided at the connection points. Bolts are arranged in the screw holes, and the bolts cooperate with nuts to connect and fix the clip pieces located on both sides of the tube screen tubes respectively, thereby clamping the reheater tightly. The upper / lower pipe clamps, fastening bolts, and nuts are all made of high-temperature and high-strength materials. The above settings enable the tube screen pipe clamp to form a surface contact with the clamped pipeline. This fixing method of the tube screen pipe clamp can at least alleviate or avoid local wear with the clamped pipeline and prevent misalignment from causing tube screen deformation. Moreover, the materials of the upper pipe clamp and the lower pipe clamp are selected as titanium cobalt alloy TiC-9ALC-5USCBN materials, which have extremely high heat and wear resistance and still have good mechanical properties under the working conditions of 1300°C. Description of the Drawings
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0019] Figure 1 It is a structural schematic diagram of the present utility model;
[0020] Figure 2 It is a top view of the structure of the present utility model;
[0021] Figure 3 This is the structural breakdown diagram of the present utility model.
[0022] The reference numerals in the figure respectively represent: 1. upper pipe clamp; 2. lower pipe clamp; 3. reheater pipe; 4. fastening bolt; 5. nut. Specific embodiments
[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0024] The present utility model will be further described below with reference to the embodiments.
[0025] Embodiment: A double-layer hoop pipe clamp, referring to the attached Figure 1 - attached Figure 3 , includes an upper pipe clamp 1 and a lower pipe clamp 2. Through holes are provided on both sides of the upper pipe clamp 1 and the lower pipe clamp 2, and a fastening bolt 4 is arranged in the through holes. A nut 5 is sleeved on one side of the fastening bolt 4. Arc-shaped grooves are inwardly formed on the inner sides of the upper pipe clamp 1 and the lower pipe clamp 2, and the two groups of arc-shaped grooves form a cavity structure together, and a reheater pipe 3 is fixed inside; by setting the pipe clamp structure to be split, when installing, the two halves are buckled together and connected by a fastening bolt 4 in the middle. When manufacturing the pipe clamp, silica sol precision casting can be used as a whole, with high tissue density, excellent mechanical properties, and a service life of more than 6 years.
[0026] There is a 2-mm gap between the upper pipe clamp 1 and the lower pipe clamp 2 brackets; for the reheater pipe clamp, each group of pipe clamps includes two clamping pieces. The inner wall of the clamping piece is arc-shaped and fits the outer peripheral surface of the reheater and the reheater pipe wall. The adjacent clamping pieces on the same side are connected end to end and integrally formed, and screw holes are provided at the joints. A fastening bolt 4 is arranged in the screw holes, and the bolt cooperates with the nut 5 to connect and fix the clamping pieces on both sides of the tube screen tubes respectively, thereby clamping the reheater tightly.
[0027] Both the upper pipe clamp 1 and the lower pipe clamp 2 are made of the selected titanium-cobalt alloy TiC-9ALC-5USCBN material; there are multiple groups of reheater pipes 3 arranged within the upper pipe clamp 1 and the lower pipe clamp 2, and a 20-cm spacing is maintained between each group of reheater pipes 3; circular hole structures are provided on one side of each group of arc-shaped grooves of the upper pipe clamp 1 and the lower pipe clamp 2, and a combined structure of a fastening bolt 4 and a nut 5 is arranged within the circular holes; the distance between each group of upper pipe clamps 1 is at least 2 meters; the upper / lower pipe clamps, the fastening bolt 4, and the nut 5 are all made of high-temperature and high-strength materials. The above settings enable the tube screen pipe clamp to form a surface contact with the clamped pipeline. This fixing method of the tube screen pipe clamp can at least alleviate or avoid local wear between the clamped pipeline, prevent misalignment from causing tube screen deformation, and the materials of the upper pipe clamp 1 and the lower pipe clamp 2 are selected as the titanium-cobalt alloy TiC-9ALC-5USCBN material, which has extremely high heat and wear resistance and still has good mechanical properties under the working conditions of 1300°C.
[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A double-layer clamp, characterized in that: The invention comprises an upper pipe clamp (1) and a lower pipe clamp (2), wherein both sides of the upper pipe clamp (1) and the lower pipe clamp (2) are provided with through holes, and fastening bolts (4) are arranged in the through holes, and a nut (5) is sleeved on one side of the fastening bolt (4), and the inner sides of the upper pipe clamp (1) and the lower pipe clamp (2) are provided with arc grooves inwardly, and the two groups of arc grooves are combined to form a cavity structure, and a reheater tube (3) is fixed inside the cavity.
2. A double-layer clamp according to claim 1, characterized in that: There is a gap of 2 mm between the upper pipe clamp (1) and the lower pipe clamp (2) brackets.
3. The double-layer clamp according to claim 1, characterized in that: The upper pipe clamp (1) and the lower pipe clamp (2) are both made of titanium-cobalt alloy TiC-9ALC-5USCBN material.
4. The double-layer clamp according to claim 1, characterized in that: The reheater tubes (3) are arranged in multiple groups in the upper tube clamp (1) and the lower tube clamp (2), and a distance of 20 cm is maintained between each group of the reheater tubes (3).
5. The double-layer clamp according to claim 4, characterized in that: The upper pipe clamp (1) and the lower pipe clamp (2) are both provided with a circular hole structure on one side of each set of arc grooves, and a combination structure of a fastening bolt (4) and a nut (5) is arranged in the circular hole.
6. The double-layer clamp according to claim 1, characterized in that: Each group of upper pipe clamps (1) is at least 2 meters apart.