Pipe clamping device and boiler equipment

Abstract

This utility model relates to the field of pipe fixing technology, and in particular to a pipe clamping device and boiler equipment. The pipe clamping device provided by this utility model includes two clamping plates arranged opposite each other and a connector. The clamping plates include a connecting part and a plurality of clamping parts spaced apart along a first direction. The plurality of clamping parts form an elastic corrugated structure, and the clamping parts fit against the pipe surface through elastic deformation. The connector connects the connecting parts of the two clamping plates so that the two clamping plates clamp the pipe. The pipe clamping device provided by this utility model can automatically adapt to the dimensional deviation between pipes and the thermal deformation during operation. While ensuring reliable clamping, it reduces the requirements for installation accuracy and improves the stability and consistency of the clamping effect.

Description

Technical Field

[0001] This utility model relates to the field of pipe fixing technology, and in particular to a pipe clamping device and boiler equipment. Background Technology

[0002] In industrial equipment, piping systems are widely used in various applications, such as boiler heating surfaces, heat exchangers, and chemical plants. These systems require specialized clamping devices to reliably secure and support the pipes. These pipe clamping devices not only bear the weight of the pipes but also constrain their displacement under internal pressure and external forces. Furthermore, in some applications, they may assist in heat dissipation to ensure the safe and stable operation of the system.

[0003] Traditional pipe clamping devices mainly employ rigid clamp structures, such as fixed clamps, welded supports, or bolt clamps. These clamps are typically designed as continuous planar structures or simple curved surface structures, using rigid connections to fix multiple pipes in predetermined positions.

[0004] However, existing rigid pipe clamping devices have significant technical shortcomings in practical applications. First, rigid clamps lack the necessary elastic adjustment capability, failing to accommodate manufacturing tolerances and installation errors between pipes. In actual engineering, the positions of multiple pipes often deviate by 2-5mm, and the pipe diameters also have certain tolerance ranges. Rigid clamps cannot simultaneously adapt to the actual conditions of all pipes, often resulting in some pipes being clamped too tightly while others are loosely clamped. Second, during operation, pipes undergo thermal expansion and deformation due to temperature changes, especially in high-temperature equipment such as boilers, where the thermal expansion can reach tens or even hundreds of millimeters. Rigid clamps cannot automatically adapt to this thermal deformation, easily generating excessive constraint reaction force when the pipe expands and loosening the clamp when the pipe contracts, severely affecting the stability and reliability of the clamping effect.

[0005] In addition, traditional rigid clamps require extremely high installation accuracy, necessitating that the pipes be arranged strictly according to the design position, and the pipe spacing error is usually required to be controlled within ±1mm. This brings great difficulties to manufacturing and installation, increasing project costs and construction complexity. Utility Model Content

[0006] This utility model provides a pipe clamping device and boiler equipment. The pipe clamping device can automatically adapt to the dimensional deviation between pipes and the thermal deformation during operation. While ensuring reliable clamping, it reduces the requirements for installation accuracy and improves the stability and consistency of the clamping effect.

[0007] In a first aspect, the present invention provides a pipe clamping device, comprising: two clamping plates arranged opposite to each other, each clamping plate including a connecting portion and a plurality of clamping portions spaced apart along a first direction, the plurality of clamping portions forming an elastic corrugated structure, the clamping portions conforming to the pipe surface through elastic deformation; and a connector connecting the connecting portions of the two clamping plates to clamp the pipe between the two clamping plates.

[0008] In one possible implementation, the clamping part has an arc-shaped groove structure that extends along the pipe extension direction.

[0009] In one possible implementation, the clamping plates are provided with support portions, and the pipe clamping device further includes: an elastic element disposed between the two clamping plates, with both ends of the elastic element abutting against the support portions of the two clamping plates respectively.

[0010] In one possible implementation, the elastic element is a disc spring assembly.

[0011] In one possible implementation, the support is provided with a positioning structure for positioning the elastic element.

[0012] In one possible implementation, multiple support portions are spaced apart along a first direction.

[0013] In one possible implementation, at least two connecting parts are provided along the first direction.

[0014] In one possible implementation, the connector is connected to the middle of the connecting portion along a second direction so that the clamping portion fits against the pipe; wherein the second direction is perpendicular to the first direction.

[0015] In one possible implementation, the connector is a bolt and nut connector.

[0016] In one possible implementation, the clamping plate is made of a high-temperature resistant alloy.

[0017] In one possible implementation, the bolt-nut connector is a stop bolt connection.

[0018] Secondly, this utility model embodiment provides a boiler device, including: a furnace body and a pipe disposed in the furnace body; the aforementioned pipe clamping device is used to fix the pipe.

[0019] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art:

[0020] The pipe clamping device provided in this embodiment of the utility model has two clamping plates arranged opposite to each other. Each clamping plate includes a connecting part and a plurality of clamping parts spaced apart along a first direction. The plurality of clamping parts form an elastic corrugated structure, which allows the clamping parts to fit against the pipe surface through elastic deformation. This fundamentally solves the technical problem that traditional rigid clamps cannot adapt to pipe position deviation and thermal deformation.

[0021] The corrugated structure's elastic properties allow each clamping part to have independent adjustment capabilities, automatically adapting to changes in the position, size, and condition of the corresponding pipeline. When manufacturing tolerances or installation errors exist in the pipeline position, each clamping part can achieve full contact with the pipeline surface through local elastic deformation, compensating for positional deviations and ensuring effective clamping of all pipelines. When the pipeline expands or contracts due to temperature changes, the corrugated structure automatically follows the pipeline's deformation, maintaining stable clamping contact through elastic adjustment. This avoids the problems of excessive constraint force generated by rigid clamps when the pipeline expands or loosening when the pipeline contracts. The connector links the two clamping plates, providing controllable clamping force, allowing the clamping force to be precisely adjusted according to specific application requirements. Simultaneously, the connector allows for detachable installation of the clamping device, facilitating maintenance and repair.

[0022] In summary, this pipe clamping device can automatically adapt to dimensional deviations between pipes and thermal deformation during operation, ensuring reliable clamping while reducing the requirements for installation accuracy and improving the stability and consistency of the clamping effect. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 A three-dimensional structural diagram of a pipe clamping device provided in an embodiment of this utility model;

[0027] Figure 2 A top view of a pipe clamping device and a pipe provided for an embodiment of this utility model;

[0028] Figure 3 A schematic diagram of the planar structure of a pipe clamping device and a pipe provided for an embodiment of this utility model;

[0029] Figure 4 An exploded structural diagram of a pipe clamping device provided in an embodiment of this utility model;

[0030] Figure 5 This is a schematic diagram of the planar structure of a pipe clamping device provided in an embodiment of the present utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] X, first direction; Y, second direction;

[0033] 1. Clamping piece; 11. Connecting part; 12. Clamping part; 121. Arc-shaped groove structure; 13. Support part; 131. Positioning structure;

[0034] 2. Pipes; 3. Connectors; 4. Elastic elements. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0037] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0038] like Figures 1-5 As shown, this utility model embodiment provides a pipe clamping device, including: two clamping plates 1 arranged opposite to each other, each clamping plate 1 including a connecting part 11 and a plurality of clamping parts 12 arranged at intervals along a first direction X, the plurality of clamping parts 12 forming an elastic corrugated structure, the clamping parts 12 fitting against the surface of the pipe 2 through elastic deformation; and a connector 3 connecting the connecting part 11 of the two clamping plates 1 so that the two clamping plates 1 clamp the pipe 2.

[0039] In this utility model, by setting two clamping pieces 1 that are configured opposite to each other, each clamping piece 1 includes a connecting part 11 and a plurality of clamping parts 12 that are spaced apart along the first direction X. The plurality of clamping parts 12 form an elastic corrugated structure, so that the clamping parts 12 can fit against the surface of the pipe 2 through elastic deformation, which fundamentally solves the technical problem that traditional rigid clamps cannot adapt to the position deviation and thermal deformation of the pipe 2.

[0040] The elastic properties of the corrugated structure allow each clamping part 12 to have independent adjustment capabilities, automatically adapting to changes in the position, size, and condition of the corresponding pipe 2. When there are manufacturing tolerances or installation errors in the position of the pipe 2, each clamping part 12 can achieve full contact with the surface of the pipe 2 through local elastic deformation, compensating for positional deviations and ensuring that all pipes 2 are effectively clamped. When the pipe 2 expands or contracts due to temperature changes, the corrugated structure can automatically follow the deformation of the pipe 2, maintaining stable clamping contact through elastic adjustment, avoiding the problems of excessive constraint force generated by rigid clamps when the pipe 2 expands and loosening of clamps when the pipe 2 contracts. The connector 3 connects the connecting part 11 of the two clamping plates 1, providing controllable clamping force, allowing the magnitude of the clamping force to be precisely adjusted according to specific application requirements. At the same time, the connector 3 enables the clamping device to be detachably installed, facilitating maintenance and repair.

[0041] In summary, this pipe clamping device can automatically adapt to dimensional deviations between pipes and thermal deformation during operation, ensuring reliable clamping while reducing the requirements for installation accuracy and improving the stability and consistency of the clamping effect.

[0042] Specifically, the heating surface pipes 2 inside the boiler are typically water-cooled wall tubes, superheater tube bundles, or reheater tube bundles, arranged in a regular array within the boiler combustion chamber. Two clamping plates 1 are positioned opposite each other above and below the array of pipes 2, forming a symmetrical clamping structure. Multiple clamping parts 12 spaced along the first direction X on each clamping plate 1 correspond to the arrangement spacing of the boiler pipes 2, typically 50-100 mm. When the boiler starts up, the pipes 2 gradually heat up from room temperature to operating temperature, expanding in length by 100-200 mm, and the spacing between the pipes 2 changes accordingly. Each clamping part 12 in the corrugated structure has independent elastic adjustment capabilities, enabling it to follow the thermal expansion of the pipes 2 and maintain effective contact with the surface of the pipes 2 through localized elastic deformation. The connector 3 provides an initial preload through the connecting part 11 that connects the two clamping plates 1. This preload is automatically adjusted during boiler operation by the elastic properties of the corrugated structure, ensuring that no excessive constraint force is generated when the pipe 2 expands thermally, and that the clamping does not loosen when the pipe 2 cools and contracts.

[0043] In a specific embodiment, in the boiler water-cooled wall system of a 600MW thermal power generating unit, the water-cooled wall pipe 2 has a diameter of 32mm, a center-to-center spacing of 60mm, and a length of approximately 12 meters for each pipe. During boiler operation, the surface temperature of the water-cooled wall pipe 2 reaches 400-450℃, causing the pipe 2 to expand due to heat, resulting in an increase in length of approximately 150mm. Simultaneously, due to uneven temperature distribution within the furnace, the expansion amount of pipe 2 varies at different locations. Traditional rigid clamping methods cannot accommodate such large deformation amounts and differences, often resulting in significant thermal stress during boiler startup due to obstructed expansion of pipe 2, potentially leading to bending deformation or even cracking of pipe 2. The corrugated elastic clamping device of this invention, with its multiple clamping parts 12, can independently follow the thermal expansion movement of each water-cooled wall pipe 2, automatically adjusting the clamping force through elastic deformation. During boiler startup, when the temperature of pipe 2 rises from 25℃ to 430℃, the elastic deformation of the corrugated structure can completely absorb the expansion displacement of pipe 2, maintaining stable clamping contact. Operational monitoring data shows that the thermal stress level of water-cooled wall pipe 2 using this elastic clamping device is reduced by more than 60% compared with traditional rigid clamping, effectively extending the service life of pipe 2 and reducing pipe 2 failure accidents caused by thermal fatigue.

[0044] In related technologies, existing boiler pipe clamping devices mainly adopt rigid clamp structures, such as fixed clamps, welded brackets, or bolt clamps. These traditional clamps are usually designed as continuous rigid structures, requiring boiler pipes 2 to be arranged strictly according to the design position, with extremely high requirements for the spacing accuracy of pipes 2. In the actual manufacturing and installation process of boilers, due to the large number of heating surface pipes 2 (more than 1,000 water-cooled wall pipes 2 in a 600MW unit), the cumulative errors in manufacturing and installation make it difficult to achieve the design accuracy for the position of pipes 2. More importantly, the high-temperature environment during boiler operation causes pipes 2 to undergo significant thermal expansion. Traditional rigid clamps cannot adapt to this thermal deformation, often generating excessive constraint reaction force when pipes 2 expand, and loosening of the clamps when pipes 2 cool, seriously affecting the safe and stable operation of the boiler.

[0045] In this embodiment of the invention, multiple clamping parts 12 spaced at intervals along the first direction X are arranged to form an elastic corrugated structure, which is specifically optimized for the thermal deformation characteristics of the boiler pipe 2. The elastic properties of the corrugated structure perfectly match the thermal expansion behavior of the boiler pipe 2. Each clamping part 12 can independently adapt to the thermal deformation of the corresponding pipe 2, ensuring necessary constraint support while avoiding thermal stress caused by excessive constraint. This design ensures that the pipe 2 receives optimal clamping support throughout the entire working cycle of boiler startup, normal operation, and shutdown, significantly improving the reliability and service life of the boiler's heating surface. The mechanism of elastic deformation and contact with the surface of the pipe 2 also ensures good heat transfer contact, which is beneficial for the cooling protection of the pipe 2 and the improvement of boiler efficiency.

[0046] In some embodiments, the clamping part 12 has an arc-shaped groove structure 121, which extends along the extension direction of the pipe 2.

[0047] In this invention, by providing a clamping part 12 with an arc-shaped groove structure 121 that extends along the extension direction of the boiler pipe 2, a large-area axial contact is achieved between the clamping device and the boiler heating surface pipe 2, significantly improving heat transfer efficiency and clamping stability. The heating surface pipe 2 inside the boiler is subjected to intense radiant heating from the high-temperature flue gas in the furnace, resulting in extremely high wall temperatures. The clamping device is needed to conduct and dissipate some of the heat to prevent overheating damage. This axially extending arc-shaped groove design transforms traditional point contact into a large-area linear contact along the axial direction of the pipe 2, not only significantly increasing the heat transfer area but also significantly improving heat transfer efficiency, providing an effective auxiliary cooling function for the boiler pipe 2.

[0048] Specifically, the boiler heating surface pipe 2 is typically made of seamless steel or alloy steel, with an outer diameter ranging from 25-76 mm and a wall thickness of 3-8 mm. The arc-shaped groove structure 121 is designed according to the specific specifications of the boiler pipe 2, with a cross-sectional curvature of 130-160 degrees, capable of encompassing most of the outer surface area of ​​the pipe 2. The arc-shaped groove structure 121 extends along the extension direction of the pipe 2, typically with an extension length of 80-200 mm in boiler applications, covering the entire support length of the pipe 2 at that location. When the clamping device is installed on the boiler heating surface, the heating surface pipe 2 is accurately embedded in the arc-shaped groove, and the outer surface of the pipe 2 forms a tight surface contact with the inner surface of the arc-shaped groove. Since high-temperature steam or hot water flows inside the boiler pipe 2, the outer wall temperature of the pipe 2 can reach 300-500℃. Through the large-area contact of the arc-shaped groove, the heat of the pipe 2 can be effectively conducted to the clamping device. The clamping device is typically made of heat-resistant steel with good thermal conductivity. The received heat is conducted through the clamping device body to a relatively cooler environment, or to specially designed heat dissipation fins and cooling channels, thus achieving auxiliary cooling of pipe 2. This axially extended contact method also enhances the constraint on the axial displacement of pipe 2, preventing pipe 2 from moving axially under the action of internal steam pressure and maintaining the geometric stability of the boiler heating surface.

[0049] In some embodiments, the clamping piece 1 is provided with a support portion 13, and the pipe clamping device further includes an elastic element 4 disposed between the two clamping pieces 1, with both ends of the elastic element 4 abutting against the support portions 13 of the two clamping pieces 1 respectively.

[0050] In this invention, by providing a support portion 13 on the clamping plate 1 and configuring an elastic element 4 between the two clamping plates 1, so that both ends of the elastic element 4 abut against the support portion 13 of the two clamping plates 1 respectively, an advanced pressure regulation and thermal compensation mechanism is established for the boiler pipe 2 clamping system. During boiler startup, operation, and shutdown, the heating surface pipe 2 experiences complex thermal cycle loads. The pipe 2 not only undergoes thermal expansion deformation but also bears thermal stress generated by temperature gradients. This elastic element 4 system can automatically adapt to the thermal deformation of the boiler pipe 2, providing stable clamping pressure while avoiding thermal stress concentration caused by excessive constraint, ensuring the safe and stable operation of the boiler heating surface throughout the entire working cycle.

[0051] Specifically, the support 13 is typically located on the non-heated side of the clamping plate 1, away from the high-temperature area of ​​the furnace, to protect the elastic element 4 from excessively high temperatures. The support 13 is made of heat-resistant steel, possessing excellent high-temperature strength and thermal stability. The elastic element 4 is positioned between the support 13 of the upper and lower clamping plates 1, and its operating temperature is controlled within the allowable operating temperature range of the elastic element 4 through thermal shielding and cooling measures. When the boiler starts up, the heated surface pipe 2 gradually heats up from room temperature. The thermal expansion of the pipe 2 causes a change in the distance between the upper and lower clamping plates 1, and the elastic element 4 is correspondingly compressed or stretched. The elastic restoring force of the elastic element 4 is transmitted to the clamping plates 1 through the support 13, and then to each clamping part 12, providing a continuous and stable clamping force for the pipe 2. This elastic compensation mechanism is particularly suitable for the operating characteristics of the boiler: when the pipe 2 expands, the elastic element 4 is further compressed, absorbing the expansion displacement while maintaining a suitable clamping pressure; when the pipe 2 contracts, the restoring force of the elastic element 4 compensates for the contraction displacement, preventing the clamps from loosening. More importantly, this design can also compensate for temperature changes in the boiler under different loads, as well as local temperature fluctuations caused by changes in combustion conditions.

[0052] In some embodiments, the elastic element 4 is a disc spring assembly.

[0053] In this invention, by specifically designing the elastic element 4 as a disc spring assembly, the goal of providing large clamping force and excellent high-temperature performance within the limited installation space of the boiler is achieved. The boiler's internal space is compact, and the heating surface pipes 2 are densely arranged, severely limiting the installation space for the clamping device. Simultaneously, the high-temperature environment of the boiler places extremely high demands on the material properties of the elastic element 4. The disc spring assembly, with its compact geometry and excellent high-temperature stability, can operate stably for extended periods under the boiler's harsh operating conditions, providing continuous and reliable clamping support for the heating surface pipes 2, ensuring the safe and efficient operation of the boiler.

[0054] Specifically, disc spring assemblies are typically made of heat-resistant alloy materials, such as Inconel 718, Inconel X-750, or 310 stainless steel. These materials maintain stable elastic properties in high-temperature environments of 500-700℃. The design of the disc spring assembly takes into account the specific operating conditions of the boiler: the outer diameter is typically 50-150mm to accommodate the spacing requirements of the boiler pipes 2; the thickness is 3-8mm to control the overall height while ensuring strength; the taper angle is optimized to achieve the best force-displacement characteristics. A single disc spring can withstand a load of 10-100kN, with a compression of approximately 20% of its free height. When a greater load-bearing capacity is required, multiple discs are combined in parallel; when a greater deformation compensation capacity is required, multiple discs are combined in series. The disc spring assembly is installed between the support portions 13 of the clamping plates 1, and the working environment is controlled within the allowable temperature range through thermal insulation measures. During boiler operation, the disc spring assembly bears the deformation load caused by the thermal expansion of the pipes 2, and must also cope with the temperature shock during boiler start-up and shutdown and the vibration load during operation. The unique geometry of disc springs gives them excellent fatigue resistance, enabling them to withstand millions of cyclic loads without failure, thus meeting the reliability requirements for long-term boiler operation.

[0055] In some embodiments, the support portion 13 is provided with a positioning structure 131, which is used to position the elastic element 4.

[0056] In this invention, by setting a positioning structure 131 in the support part 13 and using the positioning structure 131 to accurately position the elastic element 4, the positional stability and operational reliability of the disc spring assembly under harsh boiler operating conditions are achieved. During boiler operation, there are complex load conditions such as strong vibration, impact, and uneven thermal expansion. These factors can easily cause the elastic element 4 to shift position, affecting the uniformity and stability of the clamping effect. The positioning structure 131 ensures that the disc spring assembly is always in the correct working position, guarantees that the elastic force is transmitted in the predetermined direction, avoids uneven distribution of clamping force due to positional shift, and improves the overall reliability and safety of the boiler pipe 2 clamping system.

[0057] Specifically, the design of positioning structure 131 fully considers the effects of high-temperature environment and thermal expansion. Positioning structure 131 is typically made of heat-resistant steel and designed as a positioning boss, positioning ring, or positioning groove. For disc spring assemblies, positioning structure 131 is generally designed as a positioning boss that mates with the center hole of the disc spring. The diameter of the boss is 1-2 mm smaller than the diameter of the center hole, forming an appropriate clearance fit. This clearance fit achieves effective positioning and compensates for dimensional changes caused by thermal expansion, avoiding the generation of thermal stress. The height of the positioning boss is precisely calculated to ensure that the disc spring assembly is effectively constrained even under maximum compression. In the vibration environment of the boiler, positioning structure 131 prevents radial displacement of the disc spring assembly, ensuring uniform axial load transmission. When the boiler pipe 2 experiences lateral displacement due to uneven heating, positioning structure 131 constrains the disc spring assembly to remain in place, avoiding additional bending moments. Positioning structure 131 also has an assembly guiding function, simplifying the on-site installation process of the boiler and improving assembly accuracy and efficiency.

[0058] In some embodiments, the support portion 13 is provided with a plurality of portions spaced apart along the first direction X.

[0059] In this invention, by having multiple support parts 13 spaced apart along the first direction X, multi-point distributed support and uniform load transfer of the clamping force on the boiler heating surface pipes 2 are achieved. The boiler heating surface typically consists of a tube bundle structure composed of dozens or even hundreds of pipes 2, arranged along the first direction X to form a large heat transfer surface. Traditional single-point or two-point support methods cannot meet the support requirements of large-span tube bundles, easily leading to insufficient support for the middle pipes 2 and excessive constraint on the end pipes 2. The spaced arrangement of multiple support parts 13 ensures that each heating surface pipe 2 receives sufficient and uniform support, avoiding pipe deformation, vibration, and stress concentration problems caused by uneven support, thus improving the overall stability and service life of the boiler heating surface.

[0060] Specifically, in boiler heating surface applications, the number and spacing of the supports 13 are optimized based on the arrangement of the pipes 2 and the load distribution. For water-cooled wall tube bundles, the center distance of the pipes 2 is typically 50-80mm, and the spacing of the supports 13 is correspondingly set to 200-400mm, ensuring that one support 13 is provided for every 3-6 pipes 2. For superheater or reheater tube bundles, due to the larger diameter of the pipes 2 and the heavier load they bear, the spacing of the supports 13 is typically set to 300-600mm. Each support 13 bears the support load of a certain number of pipes 2, achieving uniform load distribution through multi-point distribution. The cross-sectional dimensions of the supports 13 are determined according to the load they bear, typically rectangular or I-shaped, to provide sufficient rigidity and strength. During boiler operation, the load generated by the thermal expansion of the heating surface pipes 2 is distributed to the main body of the clamping plate 1 through multiple supports 13, avoiding load concentration at a single point or a few points. This multi-point support design can also effectively cope with uneven thermal expansion during boiler operation. When the expansion of pipe 2 in certain areas is large, the corresponding support part 13 bears more load, while the load of other support parts 13 is reduced accordingly, thus realizing automatic load balancing and redistribution.

[0061] In some embodiments, at least two connecting portions 11 are provided along the first direction X.

[0062] In this invention, by providing at least two connecting parts 11 along the first direction X, multi-point connection and stable fixation of the boiler pipe clamping device are achieved, ensuring the structural integrity and connection reliability of the clamping system under the harsh operating conditions of the boiler. During operation, the boiler is subjected to enormous internal pressure, high-temperature thermal loads, and vibration and impact loads caused by unstable combustion. A single-point connection can easily become a weak link in the system, potentially leading to connection failure under extreme conditions. The multiple connecting parts 11 effectively distribute the connection load, improve connection strength and safety margin, and enhance the torsional resistance and structural stability of the clamping device, providing more reliable support for the boiler heating surface pipes 2.

[0063] Specifically, the design of the connection 11 needs to consider the effects of high-temperature environment and thermal expansion. The connection 11 is typically located at both ends of the clamping plate 1 or distributed in suitable positions, made of heat-resistant steel, possessing sufficient high-temperature strength and creep resistance. The cross-sectional design of the connection 11 considers the maximum load during boiler operation, including the weight of the pipe 2, thermal expansion load, internal pressure reaction force, and possible seismic loads. When the boiler heating surface pipe 2 is subjected to the action of internal high-pressure steam or hot water, the pipe 2 generates radial expansion force and axial thrust, which are transmitted to the connection 11 through the clamping part 12. The distributed arrangement of multiple connection parts 11 ensures uniform load distribution; each connection part 11 bears only a portion of the total load, significantly reducing the stress level at individual connection points. During boiler start-up and shutdown, the thermal expansion and contraction of the heating surface pipe 2 will generate additional loads on the connection 11; the multi-point connection design effectively disperses these loads and avoids stress concentration.

[0064] In some embodiments, the connector 3 is connected to the middle of the connector 11 along the second direction Y so that the clamping part 12 fits against the pipe 2; wherein the second direction Y is perpendicular to the first direction X.

[0065] In this invention, by connecting the connector 3 and the connecting part 11 at the middle along the second direction Y, the optimized transmission of the connecting force and the uniform distribution of the clamping effect of the boiler pipe clamping device are achieved. Boiler heating surface pipes 2 are typically arranged in layers in the vertical direction (second direction Y), such as the multi-layer pipe arrangement 2 of a water-cooled wall or the multi-row tube bundle arrangement of a superheater. The choice of connection position directly affects the uniformity of the clamping force distribution of each layer of pipes 2. The design of the middle connection ensures the symmetrical transmission of the connecting force along the second direction Y, so that the boiler pipes 2 in each layer can obtain similar clamping pressure, avoiding uneven clamping force distribution caused by eccentric connection position, and ensuring the consistency of the support effect and operational stability of each layer of pipes 2 on the boiler heating surface.

[0066] Specifically, the second direction Y typically corresponds to the height direction of the furnace or the thickness direction of the heating surface. The heating surfaces of a boiler, such as water-cooled walls, superheaters, and reheaters, often have large dimensions in the second direction Y, containing multiple layers or rows of pipes 2. The connection between the connector 3 and the connecting part 11 along the middle of the second direction Y means that the connection point is located at the geometric center of the entire heating surface in the second direction Y. The mechanical principle of this connection method is that when the connector 3 applies clamping force, the force is transmitted through the middle connection point to the connecting part 11, and then distributed to the entire clamping plate 1. Since the connection point is located at the center of the second direction Y, the generated torque is symmetrically distributed in the second direction Y, making the deformation and stress distribution of the clamping plate 1 in the second direction Y tend to be symmetrical. This symmetrical force transmission mode ensures that each layer of boiler pipes 2 distributed along the second direction Y can obtain similar clamping pressure and support effect. In the arrangement of multiple layers of pipes 2 in a boiler, this uniform clamping force distribution is particularly important because the thermal loads borne by different layers of pipes 2 may be different, requiring uniform mechanical support to ensure overall stability.

[0067] In some embodiments, the connector 3 is a bolt and nut connector 3.

[0068] In this invention, by using bolt and nut connectors 3 as the connectors 3 of the boiler pipe clamping device, reliable mechanical connection and precise clamping force adjustment and control are achieved under high temperature and high pressure environments. As a high-temperature and high-pressure device, the boiler's internal connectors 3 must withstand extreme working conditions, including temperatures up to 600°C, pressures exceeding 25 MPa, and frequent thermal cycling loads. Bolt and nut connections possess excellent high-temperature strength, connection reliability, and maintainability, enabling long-term stable operation under the boiler's harsh conditions. Simultaneously, they allow for precise adjustment of the clamping force during boiler maintenance and repair, ensuring that the boiler's heating surface pipes 2 always receive the most suitable support conditions.

[0069] Specifically, the bolt and nut connector 3 needs to be manufactured using specialized heat-resistant materials, such as 2.25Cr-1Mo steel, P91 steel, and other high-temperature alloys, to withstand the boiler's operating temperature. The bolt design considers strength decay and creep characteristics under high-temperature environments; the bolt diameter is typically 20-30% larger than that used at room temperature to ensure sufficient safety margin. The nut employs an anti-loosening design, such as a double-nut structure or a dedicated anti-loosening nut, to prevent loosening under boiler vibration. High-temperature metal gaskets or graphite composite gaskets are used to ensure the connection's sealing and durability. The bolt preload is controlled using a dedicated high-temperature torque wrench, with the torque value adjusted according to the operating temperature. During boiler operation, the bolt and nut connection bears complex loads: axial tensile force comes from the internal pressure reaction force and thermal expansion force of pipe 2; lateral force comes from the weight of pipe 2 and wind load; and cyclic load comes from boiler start-up and shutdown and load changes. The high strength and good fatigue performance of the bolt and nut connection ensure long-term reliability under these complex loads.

[0070] In some embodiments, the clamping piece 1 is made of a high-temperature resistant alloy.

[0071] In this invention, the clamping plates 1 of the boiler pipe clamping device are made of high-temperature resistant alloy, achieving long-term stable operation of the clamping device under extreme high-temperature boiler environments. The internal temperature of a boiler is extremely high, with furnace temperatures reaching 1200-1600℃ and the temperature of the heated surface area reaching 600-800℃. Ordinary steel would suffer severe oxidation, creep, and strength degradation under such high temperatures, failing to meet the requirements for long-term safe operation of the boiler. High-temperature resistant alloys possess excellent high-temperature strength, oxidation resistance, and structural stability, maintaining stable mechanical properties and geometric accuracy under extreme boiler operating conditions. This ensures that the clamping device provides continuous and reliable support for the boiler's heated pipes 2, while its excellent thermal conductivity also contributes to the heat dissipation and cooling of the pipes 2.

[0072] Specifically, the selection of high-temperature resistant alloys needs to be determined based on the specific operating temperature and environmental conditions. For the superheater area with an operating temperature of 500-600℃, materials such as 310 stainless steel, 321 stainless steel, or 2.25Cr-1Mo steel are typically selected; for the reheater area with an operating temperature of 600-700℃, high-grade heat-resistant alloys such as P91 steel and T23 steel are selected. The microstructure of these high-temperature resistant alloys is specially designed, containing stable reinforcing phases such as carbides, nitrides, or intermetallic compounds. These reinforcing phases remain stable at high temperatures, providing continuous strengthening effects for the material. After the clamping plate 1 is made of a high-temperature resistant alloy, it can maintain sufficient yield strength and tensile strength at the boiler's operating temperature and will not undergo plastic deformation due to high-temperature softening. At the same time, its excellent creep resistance ensures that the clamping plate 1 will not undergo significant dimensional changes under long-term high-temperature loads, maintaining clamping accuracy and geometric stability. The oxidation resistance of the high-temperature resistant alloy prevents high-temperature oxidation corrosion, maintaining surface quality and heat transfer performance.

[0073] In some embodiments, the bolt and nut connector 3 is a stop bolt connection.

[0074] In this invention, by employing a check bolt connection as the specific form of the bolt and nut connector 3 in the boiler pipe clamping device, long-term stability and anti-loosening reliability of the connection are achieved under the strong vibration and thermal cycling environment of the boiler. During boiler operation, various factors can lead to bolt loosening: vibration caused by unstable combustion, particle impact from the circulating fluidized bed, pulsation of steam-water circulation, and frequent start-up and shutdown thermal cycles. These factors, under long-term action, can easily cause ordinary bolt connections to gradually loosen, affecting the clamping effect and even leading to connection failure. The check bolt connection has excellent anti-loosening performance, maintaining a stable preload for a long time under the complex dynamic load environment of the boiler, ensuring the reliability of the clamping device connection, and providing continuous and stable support for the boiler heating surface pipes 2.

[0075] Specifically, the design of check bolt connections needs to consider the special requirements of high-temperature environments and complex loads. Commonly used check bolt types include wedge-shaped anti-loosening bolts, mechanical anti-loosening bolts, and chemical anti-loosening bolts. Wedge-shaped anti-loosening bolts achieve anti-loosening through specially designed wedge-shaped washers. The wedge angle of the washers creates a self-locking effect, maintaining a stable preload even under vibration. Mechanical anti-loosening bolts use a double-nut structure or a dedicated anti-loosening device, preventing the bolt from rotating in the opposite direction through mechanical restraint. Chemical anti-loosening bolts have a high-temperature anti-loosening adhesive coated on the thread surface, which forms an anti-loosening layer after curing, making them suitable for high-temperature environments. In the vibration environment of a boiler, the heated surface pipe 2 will experience periodic fretting. Traditional bolt connections are prone to loosening under such fretting. The anti-loosening mechanism of check bolts can effectively resist this fretting and maintain a stable connection. During the boiler's thermal cycle, temperature changes cause differences in thermal expansion between the bolt and the connected parts 3, generating additional thermal stress. The anti-loosening design of check bolts can maintain a reliable connection even under this thermal stress.

[0076] This utility model embodiment provides a boiler device, including: a furnace body and a pipe 2 disposed in the furnace body; the aforementioned pipe clamping device is used to fix the pipe 2.

[0077] In this invention, by applying the aforementioned pipe clamping device to boiler equipment, efficient fixing and reliable support of the boiler's heating surface pipes 2 are achieved, significantly improving the boiler's safety, reliability, and economy. As the core equipment for thermal power generation, the reliable fixing of the boiler's heating surface pipes 2 directly affects the boiler's safe operation and power generation efficiency. Traditional boiler pipe fixing methods often suffer from poor adaptability, low reliability, and difficult maintenance, especially as modern boilers trend towards higher parameters and larger capacities. The pipe clamping device of this invention is specifically designed for boiler operating conditions, providing an ideal fixing solution for the boiler's heating surface through advanced technologies such as a corrugated elastic structure, arc-groove axial contact, and disc spring assembly adjustment.

[0078] Specifically, the boiler equipment includes the boiler body and various heating surface pipes 2 installed within the boiler body, such as water-cooled wall pipes 2, superheater pipes 2, reheater pipes 2, economizer pipes 2, etc. These pipes 2 bear complex loads within the boiler: gravity loads come from the weight of the pipes 2 themselves and the weight of the internal working fluid; internal pressure loads come from high-pressure steam or hot water; thermal loads come from furnace radiation and flue gas convection heating; and dynamic loads come from fluid pulsation and equipment vibration. Pipe clamping devices are installed at key support positions on the heating surface pipes 2. Their corrugated elastic structure adapts to the thermal expansion and deformation of the pipes 2; axial contact via arc-shaped grooves achieves large-area heat conduction and dissipation; disc spring assemblies provide stable clamping pressure; and check bolts ensure long-term connection reliability. The entire clamping system forms an organic whole with the boiler's heating surface, providing not only necessary mechanical support but also crucial thermal protection functions. During boiler startup, the clamping device automatically adapts to the thermal expansion of the pipes 2, avoiding excessive constraint; during normal operation, it provides stable support and heat dissipation; and during shutdown, it compensates for the contraction and deformation of the pipes 2, preventing loosening of the support.

[0079] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also indicate the inclusion of the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0080] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0081] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pipe clamping device, characterized in that, include: Two clamping pieces (1) are arranged opposite to each other. Each clamping piece (1) includes a connecting part (11) and a plurality of clamping parts (12) spaced apart along a first direction. The plurality of clamping parts (12) form an elastic corrugated structure. The clamping parts (12) fit against the surface of the pipe (2) through elastic deformation. A connector (3) connects the connecting portion (11) of the two clamping pieces (1) so that the two clamping pieces (1) clamp the pipe (2).

2. The pipe clamping device of claim 1, wherein, The clamping part (12) has an arc-shaped groove structure (121) that extends along the extension direction of the pipe (2).

3. The pipe clamping device of claim 1, wherein, The clamping plate (1) is provided with a support portion (13), and the pipe clamping device further includes: An elastic element (4) is disposed between the two clamping pieces (1), and the two ends of the elastic element (4) abut against the support portion (13) of the two clamping pieces (1).

4. The pipe clamping device of claim 3, wherein, The elastic element (4) is a disc spring assembly.

5. The pipe clamping device of claim 3, wherein, The support part (13) is provided with a positioning structure (131), which is used to position the elastic element (4).

6. The pipe clamping device of claim 3, wherein, The support portion (13) is provided in multiple intervals along the first direction.

7. The pipe clamping device of claim 1, wherein, At least two connecting portions (11) are provided along the first direction.

8. The pipe clamping device according to claim 1 or 7, characterized in that The connector (3) is connected to the connecting part (11) at the middle in the second direction so that the clamping part (12) fits against the pipe (2); The second direction is perpendicular to the first direction.

9. The pipe clamping device of claim 1, wherein, The connector (3) is a bolt and nut connector (3).

10. A boiler apparatus, characterized by, include: Furnace body and pipes installed inside the furnace body (2); The pipe clamping device according to any one of claims 1-9 is used to fix the pipe (2).

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