Novel flue expansion joint
By designing a new flue expansion joint, using a combined structure of the expansion chamber and the limit chamber, combined with fiber rope and other reinforcement components, the problem of traditional metal expansion joints being prone to failure at high temperatures is solved, achieving higher stability, safety and cost-effectiveness.
Patent Information
- Application Number
- CN202422305805.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Traditional flue systems use metal expansion joints to easily cause creep and fatigue in high temperature environments, resulting in long-term operation failure, leakage and damage, and high manufacturing costs and complex installation and maintenance, which increases the overall operating cost of the system.
A new type of flue expansion joint is designed, including an expansion chamber and a limit chamber. The expansion chamber provides expansion gap to avoid structural stress concentration. The limit chamber provides restrictions when the flue expands to a certain extent to prevent excessive expansion; at the same time, fiber ropes are used instead of metal expansion joints, supporting frames, shock absorbing springs and thermal reflective coatings and other components to enhance system stability and thermal efficiency.
It effectively solves the thermal expansion problem caused by temperature changes in the flue, enhances the stability and safety of the system, reduces operating costs, and extends the service life of the equipment.
Smart Images
Figure CN222950640U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of expansion joints, and in particular relates to a novel flue expansion joint. Background Art
[0002] In the field of modern industry and energy, the flue system is a key component of heat energy and exhaust gas transmission. Its operational stability and safety are directly related to the efficiency and environmental protection of the entire production process. However, with the increase in the power of heat source equipment and the complexity of the working environment, the flue system faces more severe challenges, especially the thermal expansion problem caused by temperature changes in the flue, which has become one of the key factors restricting the improvement of system performance.
[0003] Traditional flue systems mostly use metal expansion joints to cope with thermal expansion, but metal materials are prone to creep and fatigue in high temperature environments, which can easily lead to expansion joint failure after long-term operation, thereby causing leakage and damage to the flue system; in addition, metal expansion joints have a high manufacturing cost and are complex to install and maintain, increasing the overall operating cost of the system. Utility Model Content
[0004] The utility model provides a new type of flue expansion joint, which aims to solve the problem that when traditional flues use metal expansion joints to cope with thermal expansion, the metal material is prone to creep and fatigue at high temperatures, and is prone to failure during long-term operation, leading to leakage and damage, and the manufacturing cost is high, the installation and maintenance are complicated, and the overall operating cost of the system is increased.
[0005] The utility model is implemented as follows: a novel flue expansion joint comprises a front section smoke pipe and a rear section smoke pipe; an expansion joint body arranged between the front section smoke pipe and the rear section smoke pipe; wherein the expansion joint body comprises: an expansion pipe connected between the front section smoke pipe and the rear section smoke pipe; the expansion pipe comprises an expansion chamber arranged at a front position, the cross section of the expansion chamber is a radially parallel cylindrical arrangement; and a limiting chamber arranged at a rear position, the cross section of the limiting chamber is a radially gradually reduced conical arrangement; the expansion chamber is sleeved at an external position of the front section smoke pipe and an expansion gap is arranged between the expansion chamber and the front section smoke pipe; a pressure plate is arranged at the outer side of the expansion pipe; a fiber rope is arranged at one end of the pressure plate; the other end of the fiber rope is evenly arranged around the external position of the front section smoke pipe located in the expansion gap.
[0006] Preferably, a support frame is provided at the bottom side of the expanded tube, and an arc-shaped groove is provided on the upper surface of the support frame, and the inner diameter of the groove is consistent with the outer diameter of the expanded tube.
[0007] Preferably, a plurality of shock-absorbing springs are arranged in the groove, a damper is integrated in each of the plurality of shock-absorbing springs, and a rubber pad is arranged on a side of the plurality of shock-absorbing springs away from the groove.
[0008] Preferably, a temperature sensor and a controller are provided in the expansion joint body, and the controller is electrically connected to the temperature sensor and the expansion joint body.
[0009] Preferably, the inner side wall of the expanded tube is provided with a heat reflective coating.
[0010] Preferably, the front section smoke pipe, the rear section smoke pipe and the side walls of the expansion pipe are all provided with a thermal insulation layer, and the thermal insulation layer is a ceramic fiber thermal insulation material.
[0011] Compared with the prior art, the embodiments of the present application have the following beneficial effects:
[0012] Firstly, the expansion cavity and the limit cavity in the expansion joint body of the device solve the problem of thermal expansion of the flue caused by temperature changes. The expansion gap provided by the expansion cavity allows the smoke pipe to stretch freely when heated, avoiding structural stress concentration; while the limit cavity provides restriction when the flue expands to a certain extent, preventing damage or leakage caused by excessive expansion. This design greatly enhances the stability and safety of the system. The fiber rope overcomes the thermal expansion and uses a metal expansion joint, which ensures that the flue will not be damaged due to high-temperature expansion and deformation, while improving the safety of the equipment and greatly saving costs.
[0013] Second: The use of the support frame of this device effectively reduces the vibration problems that may be caused by flue expansion, reduces the vibration amplitude and frequency, and reduces the stress and fatigue damage caused by vibration, thereby improving the overall stability and safety of the system.
[0014] Third: The heat-reflective coating on the inner wall of the expanded tube of this device can reflect most of the incident heat and reduce heat loss; it effectively prevents heat loss through the side wall of the smoke tube. By reducing heat loss and improving thermal efficiency, the operating temperature of the flue can be better controlled, avoiding damage to the equipment due to overheating or excessive temperature fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0016] Figure 2 It is a front cross-sectional structural schematic diagram of the utility model;
[0017] Figure 3 It is a front view of the utility model;
[0018] Figure 4 It is a schematic diagram of the support frame structure of the utility model;
[0019] In the figure: 1. front section of the smoke pipe; 2. rear section of the smoke pipe; 3. expansion joint body; 4. expansion pipe; 5. expansion cavity; 6. limit cavity; 7. expansion gap; 8. pressure plate; 9. fiber rope; 10. support frame; 11. groove; 12. shock-absorbing spring; 13. rubber pad; 14. temperature sensor; 15. controller; 16. insulation layer. DETAILED DESCRIPTION
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.
[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0022] The utility model embodiment provides a new type of flue expansion joint, such as Figure 1-4 As shown, it includes a front section smoke pipe 1 and a rear section smoke pipe 2; an expansion joint body 3 arranged between the front section smoke pipe 1 and the rear section smoke pipe 2; wherein the expansion joint body 3 includes: an expansion tube 4 connected between the front section smoke pipe 1 and the rear section smoke pipe 2; the expansion tube 4 includes an expansion chamber 5 arranged at the front position, the cross section of the expansion chamber 5 is a radially parallel cylindrical arrangement; and a limiting chamber 6 arranged at the rear position, the cross section of the limiting chamber 6 is a radially gradually reduced conical arrangement; the expansion chamber 5 is sleeved at the external position of the front section smoke pipe 1 and an expansion gap 7 is arranged between the front section smoke pipe 1; a pressure plate 8 is arranged at the outside of the expansion tube 4; a fiber rope 9 is arranged at one end of the pressure plate 8; the other end of the fiber rope 9 is evenly arranged around the external position of the front section smoke pipe 1 located in the expansion gap 7.
[0023] It should be noted that, since the traditional flue adopts metal expansion joints to cope with thermal expansion, the metal material is prone to creep and fatigue at high temperature, and is prone to failure in long-term operation, resulting in leakage and damage, and the manufacturing cost is high, the installation and maintenance are complicated, and the overall operating cost of the system is increased. The present solution effectively solves the problem of thermal expansion of the flue caused by temperature changes through the design of the expansion chamber 5 and the limit chamber 6 in the expansion joint body 3, avoids damage or leakage caused by structural stress concentration and excessive expansion, thereby greatly enhancing the stability of the system; at the same time, the use of fiber rope 9 overcomes the limitations of traditional metal expansion joints, improves the safety of the equipment and saves costs; in addition, the combined application of the support frame 10, the shock-absorbing spring 12 and the rubber pad 13 effectively reduces the vibration problem that may be caused by the expansion of the flue, and further improves the stability and safety of the system; finally, the heat-reflecting coating on the inner wall of the expansion tube 4 and the ceramic fiber insulation layer 16 work together to improve the thermal efficiency and control the operating temperature, avoiding damage to the equipment due to overheating or excessive temperature fluctuations, thereby extending the service life of the equipment.
[0024] Specifically, in this embodiment, the scheme mainly includes a front section smoke pipe 1 and a rear section smoke pipe 2; an expansion joint body 3 arranged between the front section smoke pipe 1 and the rear section smoke pipe 2; the front section smoke pipe 1 is connected to a heat source or other equipment as the upstream of the flue system, and the rear section smoke pipe 2 is connected to a discharge port or other processing equipment as the downstream; the expansion chamber 5 is located at the front of the expansion joint body 3, and its cross section is a radially parallel cylindrical design, which is used to sleeve the front section smoke pipe 1 and maintain a certain expansion gap 7 between them; the existence of this gap is to accommodate the axial thermal expansion of the flue caused by temperature changes; at the same time, the limit chamber 6 is located at the rear of the expansion joint body 3, and its cross section is a radially gradually reduced cone. This design provides additional restriction when the flue expands to a certain extent, effectively preventing the flue from being damaged or leaking due to excessive expansion;
[0025] In order to further enhance the stability and support of the expansion joint, a pressure plate 8 is welded on the outside of the expansion tube 4; the pressure plate 8 is not only used to fix the fiber rope 9, but also provides additional structural support; one end of the fiber rope 9 is firmly fixed on the pressure plate 8, and the other end is evenly wound around the outer position of the front section smoke pipe 1 located in the expansion gap 7;
[0026] When the flue system expands due to increased temperature, the front section of the smoke pipe 1 will try to move into the expansion pipe 4; at this time, the fiber rope 9 wrapped around the outer wall of the front section of the smoke pipe 1 will use its elasticity to absorb this expansion and be compressed in the gap; as the amount of expansion increases, the fiber rope 9 is gradually compressed tighter, thereby maintaining the stability and sealing of the flue system; when the flue system cools and shrinks, the front section of the smoke pipe 1 will try to move outward; at this time, the fiber rope 9 will use its elasticity to restore its original shape and push the section of the smoke pipe back to its original position; this restoring force helps to maintain the continuity and stability of the flue system; and effectively prevents the stress and displacement caused by the expansion of the flue from affecting the overall stability of the system.
[0027] In a further preferred embodiment of the present invention, Figure 1-4 As shown, a support frame 10 is disposed at the bottom side of the expansion tube 4 , and an arc-shaped groove 11 is formed on the upper surface of the support frame 10 , and the inner diameter of the groove 11 is consistent with the outer diameter of the expansion tube 4 .
[0028] In this embodiment, the support frame 10 is located at the bottom side of the expansion tube 4, directly contacts the expansion tube 4 and provides support. An arc-shaped groove 11 is provided on the upper surface of the support frame 10, and the groove 11 ensures that the support frame 10 can fit tightly on the outer wall of the expansion tube 4, providing uniform and stable supporting force.
[0029] In a further preferred embodiment of the present invention, Figure 1-4 As shown, a plurality of shock absorbing springs 12 are arranged in the groove 11 , a damper is integrated in each of the shock absorbing springs 12 , and a rubber pad 13 is arranged on a side of the shock absorbing springs 12 away from the groove 11 .
[0030] In this embodiment, when the expansion tube 4 is displaced due to the thermal expansion of the flue system, the damping spring 12 can absorb and store part of the energy; the vibration amplitude and frequency are reduced by the elastic action of the damping spring 12, and the stress and fatigue damage caused by the vibration are reduced, thereby improving the stability and safety of the system; in order to further enhance the damping effect, a damper is integrated inside the damping spring 12 to effectively suppress the vibration of the expansion tube 4 and reduce the influence of the vibration on the entire flue system;
[0031] In addition, the rubber pad 13, as a buffer layer between the shock-absorbing spring 12 and the expansion tube 4, can deform and absorb part of the energy; this soft transition layer mitigates the direct impact of external force on the shock-absorbing spring 12 and the expansion tube 4, further reducing the vibration and noise level of the system; the sealing performance of the rubber pad 13 also prevents external media from penetrating into the support frame 10, protecting the normal operation of the shock-absorbing spring 12 and the damper.
[0032] In a further preferred embodiment of the present invention, Figure 1-2As shown, a temperature sensor 14 and a controller 15 are disposed in the expansion joint body 3 , and the controller 15 is electrically connected to the temperature sensor 14 and the expansion joint body 3 .
[0033] In this embodiment, the temperature sensor 14 (PT100) can sense the temperature changes of the flue caused by the heating of the heat source, and convert the temperature information into electrical signals and transmit them to the controller 15 (STM32F0). The controller 15 can automatically determine whether it is necessary to adjust the working state of the expansion joint according to the preset control logic and temperature data. For example, when the temperature in the flue exceeds a certain threshold, the controller 15 can issue an instruction to make corresponding adjustments to the fiber rope 9 in the expansion joint body 3 to adapt to the thermal expansion effect caused by the temperature change.
[0034] In a further preferred embodiment of the present invention, Figure 1-2 As shown, the inner wall of the expansion tube 4 is provided with a heat reflective coating.
[0035] In this embodiment, by reflecting most of the incident heat and reducing the loss of its own heat, the heat reflective coating helps to maintain a high temperature environment inside the expansion tube 4, thereby improving the thermal efficiency of the entire flue system.
[0036] In a further preferred embodiment of the present invention, Figure 2 As shown, the side walls of the front section smoke pipe 1, the rear section smoke pipe 2 and the expansion pipe 4 are all provided with a heat-insulating layer 16, and the heat-insulating layer 16 is a ceramic fiber heat-insulating material.
[0037] In this embodiment, the ceramic fiber material has excellent high-temperature stability, and can maintain the stability of its physical and chemical properties at extremely high temperatures, effectively reducing heat conduction losses through the side walls of the flue pipe and improving the thermal efficiency of the flue system.
[0038] Working principle: In the flue system, the front section flue pipe 1 is used as the connection point of the heat source or other equipment, carrying the high-temperature flue gas and directing it downstream; in order to cope with the axial thermal expansion of the flue due to temperature changes, the expansion cavity 5 in the expansion joint body 3 adopts a radially parallel cylindrical design, which is sleeved and accommodates the front section flue pipe 1, while maintaining a certain expansion gap 7; this gap ensures that the front section flue pipe 1 has enough space to expand when it expands due to heat, thereby avoiding stress concentration in the structure;
[0039] At the other end of the expansion joint, the limit cavity 6 provides an additional safety barrier with its radially gradually reduced conical design; when the front section of the flue expands to a certain extent, the limit cavity 6 begins to play a role, limiting the further expansion of the front section of the flue, effectively preventing damage or leakage problems that may be caused by excessive expansion;
[0040] In order to enhance the stability and support of the expansion joint, a pressure plate 8 is welded on the outside of the expansion tube 4. These pressure plates 8 not only fix the fiber rope 9, but also serve as a structural support to enhance the overall rigidity; the fiber rope 9 has its unique elastic characteristics, one end of which is fixed on the pressure plate 8, and the other end is evenly wound around the outside of the front smoke pipe 1 and is located in the expansion gap 7; when the flue expands due to the increase in temperature, the fiber rope 9 is compressed, absorbing and buffering the movement of the smoke pipe, maintaining the stability and sealing of the system; on the contrary, during the cooling process, the fiber rope 9 uses its elasticity to restore its original state, pushing the smoke pipe back to its original position, ensuring the continuity and stability of the system;
[0041] In addition, in order to deal with the vibration problem that may be caused by the expansion of the flue, the support frame 10 is installed on the bottom side of the expansion pipe 4, and the arc groove 11 on it is closely attached to the outer wall of the expansion pipe 4 to provide uniform and stable supporting force; the combination of the shock absorbing spring 12 and the damper further enhances the shock absorbing effect and reduces the impact of vibration on the system; the rubber pad 13, as a buffer layer, not only absorbs energy, but also prevents the infiltration of external media, protecting the normal operation of internal components;
[0042] The temperature sensor 14 is used to monitor the temperature change in the flue in real time and transmit the data to the controller 15; the controller 15 automatically adjusts the working state of the expansion joint according to the preset logic and temperature data, such as adjusting the tension of the fiber rope 9 to adapt to the thermal expansion effect, so as to ensure the stable operation of the flue system;
[0043] Finally, the heat-reflective coating on the inner wall of the expansion tube 4 and the ceramic fiber insulation layer 16 on the side wall work together to improve the thermal efficiency of the flue system; the heat-reflective coating reflects most of the incident heat and reduces heat loss; and the ceramic fiber insulation layer 16, with its excellent high-temperature stability and low thermal conductivity, effectively reduces the heat conduction loss through the side wall of the flue tube; the combination of the two not only improves the thermal efficiency of the system, but also extends the service life of the equipment.
[0044] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the utility model is not limited by the described action sequence, because according to the utility model, some steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the utility model.
[0045] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.
[0046] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0047] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.
Claims
1. A new type of flue expansion joint, characterized in that: include: Front smoke pipe and rear smoke pipe; An expansion joint body disposed between the front section smoke pipe and the rear section smoke pipe; Wherein, the expansion joint body comprises: A pipe expansion device connected between the front smoke pipe and the rear smoke pipe; The expansion tube includes an expansion chamber arranged at the front position, and the cross section of the expansion chamber is arranged in a radially parallel cylindrical shape; and A limiting cavity is arranged at the rear position, wherein the cross section of the limiting cavity is arranged in a conical shape which gradually decreases in radial direction; The expansion chamber is sleeved at the outer position of the front section smoke pipe and an expansion gap is provided between the expansion chamber and the front section smoke pipe; A pressure plate disposed outside the expanded tube; A fiber rope is provided at one end of the pressing plate; The other end of the fiber rope is evenly arranged around the outer position of the front smoke pipe located in the expansion gap.
2. A novel flue expansion joint as claimed in claim 1, characterized in that: A support frame is arranged at the bottom side of the expanded tube, and an arc-shaped groove is opened on the upper surface of the support frame, and the inner diameter of the groove is consistent with the outer diameter of the expanded tube.
3. A novel flue expansion joint as claimed in claim 2, characterized in that: A plurality of shock absorbing springs are arranged in the groove, a damper is integrated in each of the plurality of shock absorbing springs, and a rubber pad is arranged on a side of the plurality of shock absorbing springs away from the groove.
4. A novel flue expansion joint as claimed in claim 1, characterized in that: A temperature sensor and a controller are arranged in the expansion joint body, and the controller is electrically connected to the temperature sensor and the expansion joint body.
5. A novel flue expansion joint as claimed in claim 2, characterized in that: The inner side wall of the expanded tube is provided with a heat reflective coating.
6. A novel flue expansion joint as claimed in claim 5, characterized in that: The front section smoke pipe, the rear section smoke pipe and the side walls of the expansion pipe are all provided with a heat-insulating layer, and the heat-insulating layer is a ceramic fiber type heat-insulating material.