An air duct compensator having a multi-layer bellows structure

Abstract

The application relates to a wind channel compensator with a multilayer bellows structure and belongs to the technical field of industrial ventilation and air conditioning equipment, which comprises an inlet connecting pipe, a multilayer bellows assembly and an outlet connecting pipe which are sequentially connected. The application is characterized in that the multilayer bellows assembly is arranged. During the working process, when the wind channel is caused to expand or contract due to temperature change or displacement is caused due to installation error, the bellows bodies arranged coaxially in multiple layers can be synchronously stretched / compressed in the axial direction, deviated in the lateral direction or bent and deformed in the angular direction due to the elastic properties of the bellows structure, the elastic deformation capacity of the multilayer structure is stronger than that of a traditional single-layer bellows, and the multilayer structure can adapt to displacement compensation of a larger amplitude. Meanwhile, when vibration generated by the wind channel connecting equipment is transmitted to the multilayer bellows assembly, the elastic damping material in the buffer cavity can absorb vibration energy through self-deformation, and the arrangement mode of the inner wall and the outer wall of the bellows body can weaken the vibration transmission path.

Description

Technical Field

[0001] This application relates to the field of industrial ventilation and air conditioning equipment technology, and in particular to a duct compensator with a multi-layer corrugated pipe structure. Background Technology

[0002] In industrial ventilation and HVAC (heating, ventilation and air conditioning) fields, duct systems are a key component for air transport and distribution. During long-term operation, ducts are susceptible to thermal expansion and contraction due to changes in ambient temperature (such as high temperatures in summer and low temperatures in winter), leading to axial, lateral, or angular displacement. Simultaneously, vibrations generated by connected equipment such as fans and pumps can cause structural resonance in the ductwork, accelerating wear. Furthermore, installation errors are inevitable due to limitations in construction precision and site space. All these issues negatively impact the stability and safety of the duct system.

[0003] Traditional duct compensators mostly employ a single-layer bellows structure, which has limited elastic deformation capacity and can only compensate for small displacements. When the duct displacement is large, the single-layer bellows is prone to fatigue damage, resulting in a short service life. Furthermore, the single-layer structure has poor vibration damping effect and cannot effectively block the transmission of equipment vibration to the duct, leading to significant duct operating noise. In addition, some traditional compensators have insufficient sealing performance, easily causing air leakage during air transport, reducing the transport efficiency of the duct system, and potentially affecting air quality due to the entry of external impurities into the duct. Therefore, there is an urgent need for a duct compensator that can achieve large displacement compensation, possesses good vibration and noise reduction effects, and has excellent sealing performance to solve the above-mentioned problems of existing technologies. To this end, a duct compensator with a multi-layer bellows structure is provided. Utility Model Content

[0004] The purpose of this application is to provide a duct compensator with a multi-layer corrugated pipe structure, which has the characteristics of achieving large displacement compensation, having good vibration reduction and noise reduction effect and excellent sealing performance.

[0005] This application provides a duct compensator with a multi-layer corrugated pipe structure, employing the following technical solution: It includes an inlet pipe, a multi-layer corrugated pipe assembly, and an outlet pipe connected sequentially. The two ends of the multi-layer corrugated pipe assembly are respectively sealed to the inlet pipe and the outlet pipe. The multi-layer corrugated pipe assembly includes at least two coaxially arranged corrugated pipe bodies, with a sealed buffer cavity formed between adjacent corrugated pipe bodies. The buffer cavity is filled with an elastic damping material, which is fitted against the inner and outer walls of the adjacent corrugated pipe bodies. A protective sleeve is fitted onto the outer wall of the multi-layer corrugated pipe assembly. The protective sleeve is made of a flexible, wear-resistant material, and its two ends are fixedly connected to the inlet pipe and the outlet pipe, respectively. Sealing rings are provided at the connections between the inlet pipe and the multi-layer corrugated pipe assembly, and at the connections between the outlet pipe and the multi-layer corrugated pipe assembly. These sealing rings are made of a high-temperature resistant sealing material.

[0006] By adopting the above technical solutions, the multi-layer corrugated pipe assembly, with at least two coaxial corrugated pipe bodies, significantly improves its elastic deformation capacity, enabling it to adapt to larger displacements in the duct caused by thermal expansion and contraction or installation errors. This solves the problems of traditional single-layer corrugated pipe compensators, which have limited deformation capacity, can only compensate for small displacements, and are prone to fatigue damage, thus extending the service life of the compensator. The elastic damping material in the buffer cavity, which is attached to the inner and outer walls of the corrugated pipe body, can efficiently absorb the vibration energy of the equipment, block the vibration transmission path, and reduce duct resonance and operating noise. The sealing ring and the sealing connection of the multi-layer corrugated pipe assembly form a double seal, preventing air leakage and the entry of external impurities, ensuring the duct conveying efficiency and air quality. The flexible and wear-resistant protective sleeve can isolate external dust and scratches from damaging the multi-layer corrugated pipe assembly, further extending the life of the core components.

[0007] Preferably, the inlet pipe is provided with an inlet flange at the end away from the multi-layer corrugated pipe assembly, and the outlet pipe is provided with an outlet flange at the end away from the multi-layer corrugated pipe assembly. Both the inlet flange and the outlet flange are provided with mounting holes for connecting to the air duct.

[0008] By adopting the above technical solution, the inlet flange and outlet flange are bolted to the compensator and the air duct through the mounting holes. Compared with the traditional non-flange connection method, this greatly improves the assembly stability and avoids the compensator from loosening and shifting during air duct operation. At the same time, the flange structure reduces the installation difficulty, adapts to the connection requirements of air ducts of different specifications, and improves the versatility of the device.

[0009] Preferably, the outer corrugated pipe body of the multi-layer corrugated pipe assembly is provided with reinforcing ribs at both the crests and troughs, and the reinforcing ribs are arranged along the circumferential direction of the outer corrugated pipe body.

[0010] By adopting the above technical solution, the reinforcing ribs set along the circumferential direction at the crests and troughs of the outer corrugated pipe body can disperse the local stress generated during displacement deformation, avoid damage such as cracking and wrinkling of the outer corrugated pipe due to stress concentration, enhance the structural load-bearing capacity of the multi-layer corrugated pipe assembly, and further extend the overall service life of the compensator, especially in long-term large displacement compensation scenarios.

[0011] Preferably, the inner walls of both the inlet and outlet pipes are provided with an anti-corrosion coating, which is made of corrosion-resistant paint.

[0012] By adopting the above technical solution, the anti-corrosion coating on the inner wall of the inlet and outlet pipes can isolate the air transported in the duct from direct contact with the inner wall of the pipe, prevent the inner wall of the pipe from rusting and corroding, avoid the reduction of structural strength or secondary air pollution caused by pipe corrosion, and expand the applicability of the compensator in corrosive environments.

[0013] Preferably, the inner wall of the protective sleeve is provided with anti-slip protrusions, which are spaced apart along the length of the protective sleeve and fit against the outer wall of the multi-layer corrugated pipe assembly.

[0014] By adopting the above technical solution, the anti-slip protrusions distributed at intervals along the length of the inner wall of the protective sleeve, through their fit with the outer wall of the multi-layer corrugated pipe assembly, restrict the sliding displacement of the protective sleeve during the operation of the compensator, ensuring that the protective sleeve always completely covers the multi-layer corrugated pipe assembly, avoiding the problem of local exposure and protection failure caused by the displacement of the protective sleeve, and ensuring the stability of the protection effect.

[0015] Preferably, the outer walls of both the inlet pipe and the outlet pipe are fitted with heat insulation sleeves, which are made of high-temperature resistant heat insulation material, and the two ends of the heat insulation sleeves extend towards the ends of the inlet pipe and the outlet pipe, respectively.

[0016] By adopting the above technical solution, the heat insulation sleeves on the outer walls of the inlet and outlet pipes can prevent the heat of the high-temperature or low-temperature air inside the pipe from being transferred to the outside, thus avoiding the impact of abnormal temperature on the outer wall of the pipe on surrounding equipment or operators. At the same time, it reduces the energy loss of the air inside the pipe and improves the energy utilization efficiency of the duct system. Furthermore, the design of extending the heat insulation sleeve to the end of the pipe further expands the heat insulation range and prevents heat leakage at the connection.

[0017] Preferably, a support member is provided between two adjacent corrugated pipe bodies in the multi-layer corrugated pipe assembly. The support member is spaced apart along the axial direction of the corrugated pipe body, and both ends of the support member are fixedly connected to the inner wall and outer wall of the two adjacent corrugated pipe bodies, respectively.

[0018] By adopting the above technical solution, the support members that are spaced apart along the axial direction between two adjacent corrugated pipe bodies can stably maintain the distance between the two corrugated pipes, avoid the two corrugated pipes from sticking together and rubbing or the distance from being too large when the compensator deforms, ensure that the multi-layer corrugated pipes deform synchronously, and improve the accuracy and stability of displacement compensation.

[0019] Preferably, both the inlet flange and the outlet flange have sealing gasket grooves on their end faces, and a flexible sealing gasket is adapted to be installed in the sealing gasket groove, the thickness of the flexible sealing gasket matching the depth of the sealing gasket groove.

[0020] By adopting the above technical solution, the sealing gasket grooves on the end faces of the inlet and outlet flanges can fix the installation position of the flexible sealing gasket and prevent the gasket from shifting. Furthermore, the compatibility between the thickness of the flexible sealing gasket and the depth of the sealing gasket groove ensures that the gasket can be fully squeezed and deformed when the flange is connected to the air duct, filling the joint gap, strengthening the sealing of the flange connection, further reducing air leakage, and ensuring the conveying efficiency of the air duct system.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] This type of duct compensator features a multi-layered corrugated pipe structure. During operation, when the duct expands or contracts due to temperature changes or displacement occurs due to installation errors, the multiple coaxially arranged corrugated pipes can simultaneously undergo axial tension / compression, lateral displacement, or angular bending deformation thanks to the elastic properties of their corrugated structure. Compared to traditional single-layer corrugated pipes, the multi-layered structure offers stronger elastic deformation capabilities, enabling it to accommodate larger displacements. Simultaneously, when vibrations from duct connection equipment are transmitted to the multi-layered corrugated pipe assembly, the elastic damping material within the buffer cavity absorbs the vibration energy through its own deformation. Furthermore, its conformal design to the inner and outer walls of the corrugated pipe body comprehensively weakens the vibration transmission path, effectively addressing the limitations of traditional compensators that restrict elastic deformation and can only compensate for small displacements. This design addresses the issue of "easily fatigued and damaged" compensators, extending their service life while significantly improving vibration damping, reducing duct resonance and wear caused by vibration, and lowering duct operating noise. By incorporating a sealing ring and multi-layer bellows assembly, the sealing ring tightly fills the joint gaps when the inlet and outlet pipes connect to the multi-layer bellows assembly during operation. The high-temperature resistant sealing material adapts to varying air temperatures within the duct, preventing seal failure due to temperature changes. Simultaneously, the multi-layer bellows assembly's structural sealing, combined with the sealing ring, provides double-seal protection, resolving the problems of insufficient sealing performance and easy air leakage inherent in traditional compensators. This prevents air leakage within the duct, ensuring the air transport efficiency of the duct system and blocking external impurities from entering the duct, thus preventing air quality from being affected. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure in frontal three-dimensional cross-section of this application;

[0024] Figure 2 This is a three-dimensional structural diagram of the present application.

[0025] Figure 3 This is a three-dimensional structural diagram of the side of the multi-layer bellows assembly of this application;

[0026] Figure 4 This is a structural schematic diagram of the side of the imported pipe assembly in this application;

[0027] Figure 5 This is a schematic diagram of the structure of the inner wall of the protective sleeve in this application;

[0028] Figure 6 This is a schematic diagram of the end faces of the inlet flange and outlet flange in this application.

[0029] In the picture:

[0030] 1. Inlet pipe; 2. Multi-layer corrugated pipe assembly; 201. Corrugated pipe body; 202. Buffer cavity; 203. Elastic vibration damping material; 204. Support component; 3. Outlet pipe; 4. Protective sleeve; 5. Sealing ring; 6. Inlet flange; 7. Outlet flange; 8. Reinforcing rib; 9. Anti-corrosion coating; 10. Anti-slip protrusion; 11. Heat insulation sleeve; 12. Sealing gasket groove; 13. Flexible sealing gasket. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0032] Example 1: A duct compensator with a multi-layer corrugated pipe structure, referring to... Figure 1 , Figure 2 and Figure 3The system includes an inlet pipe 1, a multi-layer corrugated pipe assembly 2, and an outlet pipe 3 connected in sequence. Both ends of the multi-layer corrugated pipe assembly 2 are sealed to the inlet pipe 1 and the outlet pipe 3, respectively. The multi-layer corrugated pipe assembly 2 includes at least two coaxially arranged corrugated pipe bodies 201, with a sealed buffer cavity 202 formed between adjacent corrugated pipe bodies 201. The buffer cavity 202 is filled with elastic damping material 203, which adheres to the inner and outer walls of the adjacent corrugated pipe bodies 201. A protective sleeve 4 is fitted onto the outer wall of the multi-layer corrugated pipe assembly 2. The protective sleeve 4 is made of flexible wear-resistant material, and both ends of the protective sleeve 4 are fixedly connected to the inlet pipe 1 and the outlet pipe 3, respectively. Sealing rings 5 ​​are provided at the connection points between the inlet pipe 1 and the multi-layer corrugated pipe assembly 2, and at the connection points between the outlet pipe 3 and the multi-layer corrugated pipe assembly 2. The sealing rings 5 ​​are made of high-strength wear-resistant material. Made of heat-sealing material, the multi-layer corrugated pipe assembly 2 has at least two coaxial corrugated pipe bodies 201, which greatly improves the elastic deformation capacity and can adapt to larger displacements caused by thermal expansion and contraction or installation errors in the air duct. This solves the problems of "limited deformation capacity, only able to compensate for small displacements, and easy fatigue damage" of traditional single-layer corrugated pipe compensators, and extends the service life of the compensator. The elastic damping material 203 in the buffer cavity 202, which is attached to the inner and outer walls of the corrugated pipe body 201, can efficiently absorb the vibration energy of the equipment, block the vibration transmission path, and reduce the resonance and operating noise of the air duct. The sealing ring 5 and the sealing connection of the multi-layer corrugated pipe assembly 2 form a double seal to prevent air leakage and the entry of external impurities, ensuring the air duct conveying efficiency and air quality. The flexible and wear-resistant protective sleeve 4 can isolate the multi-layer corrugated pipe assembly 2 from external dust and scratches, further extending the life of the core components.

[0033] Reference Figure 1 , Figure 2 and Figure 3 An inlet flange 6 is provided at the end of the inlet pipe 1 furthest from the multi-layer corrugated pipe assembly 2, and an outlet flange 7 is provided at the end of the outlet pipe 3 furthest from the multi-layer corrugated pipe assembly 2. Both the inlet flange 6 and the outlet flange 7 have mounting holes for connection to the duct. Reinforcing ribs 8 are provided at the crests and troughs of the outer corrugated pipe body 201 of the multi-layer corrugated pipe assembly 2, and these reinforcing ribs 8 are arranged along the circumference of the outer corrugated pipe body 201. The inlet flange 6 and the outlet flange 7 are bolted to the duct via the mounting holes, which is a more efficient method compared to traditional non-flange connections. This design significantly improves assembly stability and prevents the compensator from loosening or shifting during duct operation. Simultaneously, the flange structure reduces installation difficulty, adapts to the connection requirements of different duct specifications, and enhances the device's versatility. The reinforcing ribs 8, located at the crests and troughs of the outer bellows body 201 along the circumferential direction, disperse localized stress generated during displacement deformation, preventing cracking, wrinkling, and other damage to the outer bellows due to stress concentration. This enhances the structural load-bearing capacity of the multi-layer bellows assembly 2, especially in long-term large displacement compensation scenarios, further extending the overall service life of the compensator.

[0034] Reference Figure 1 , Figure 4 and Figure 5 The inner walls of both the inlet pipe 1 and the outlet pipe 3 are coated with an anti-corrosion coating 9, which is made of corrosion-resistant paint. The inner wall of the protective sleeve 4 is provided with anti-slip protrusions 10, which are spaced along the length of the protective sleeve 4 and fit against the outer wall of the multi-layer corrugated pipe assembly 2. The anti-corrosion coating 9 on the inner walls of the inlet pipe 1 and the outlet pipe 3 can isolate the air transported in the duct from direct contact with the inner wall of the pipe, prevent the inner wall of the pipe from rusting and corroding, avoid the reduction of structural strength or secondary air pollution caused by pipe corrosion, and expand the applicability of the compensator in corrosive environments. The anti-slip protrusions 10 spaced along the length of the inner wall of the protective sleeve 4, by fitting against the outer wall of the multi-layer corrugated pipe assembly 2, limit the sliding displacement of the protective sleeve 4 during the operation of the compensator, ensure that the protective sleeve 4 always completely covers the multi-layer corrugated pipe assembly 2, avoid the problem of local exposure and protection failure caused by the displacement of the protective sleeve 4, and ensure the stability of the protection effect.

[0035] Reference Figure 1 , Figure 4 and Figure 6Both the inlet pipe 1 and the outlet pipe 3 are fitted with heat insulation sleeves 11. The heat insulation sleeves 11 are made of high-temperature resistant heat insulation material, and both ends of the heat insulation sleeves 11 extend towards the ends of the inlet pipe 1 and the outlet pipe 3, respectively. In the multi-layer corrugated pipe assembly 2, a support member 204 is provided between two adjacent corrugated pipe bodies 201. The support member 204 is spaced along the axial direction of the corrugated pipe body 201, and both ends of the support member 204 are fixedly connected to the inner and outer walls of the two adjacent corrugated pipe bodies 201, respectively. The end faces of the inlet flange 6 and the outlet flange 7 are provided with sealing gasket grooves 12. A flexible sealing gasket 13 is fitted into the sealing gasket groove 12. The thickness of the flexible sealing gasket 13 matches the depth of the sealing gasket groove 12. The heat insulation sleeves 11 on the outer walls of the inlet pipe 1 and the outlet pipe 3 can prevent the heat of the high-temperature or low-temperature air inside the pipe from being transferred to the outside, avoiding abnormal temperature of the outer wall of the pipe from causing damage to surrounding equipment or operators. This design reduces energy loss of air inside the pipe and improves the energy efficiency of the duct system. Furthermore, the design of the insulation sleeve 11 extending towards the end of the pipe further expands the insulation range, preventing heat leakage at the connection point. The axially spaced support members 204 between adjacent corrugated pipe bodies 201 stably maintain the distance between the two corrugated pipes, preventing friction or excessive spacing between the two layers of corrugated pipes when the compensator deforms, ensuring synchronous deformation of multiple corrugated pipes, and improving the accuracy and stability of displacement compensation. The sealing gasket grooves 12 on the end faces of the inlet flange 6 and the outlet flange 7 fix the installation position of the flexible sealing gasket 13, preventing gasket displacement. The compatibility between the thickness of the flexible sealing gasket 13 and the depth of the sealing gasket groove 12 ensures that the gasket can be fully compressed and deformed when the flange is connected to the duct, filling the connection gap, strengthening the sealing of the flange connection, further reducing air leakage, and ensuring the conveying efficiency of the duct system.

[0036] In this embodiment, by setting up a multi-layer corrugated pipe assembly 2, during operation, when the duct expands and contracts due to temperature changes or when there is displacement due to installation errors, the multi-layer coaxial corrugated pipe body 201 can simultaneously undergo axial tension / compression, lateral displacement, or angular bending deformation due to the elastic characteristics of its own corrugated structure. Compared with the traditional single-layer corrugated pipe, the multi-layer structure has a stronger elastic deformation capacity and can adapt to a larger displacement compensation. At the same time, when the vibration generated by the duct connection equipment is transmitted to the multi-layer corrugated pipe assembly 2, the elastic damping material 203 in the buffer cavity 202 will absorb the vibration energy through its own deformation. Moreover, the way it is set to fit the inner and outer walls of the corrugated pipe body 201 can comprehensively weaken the vibration transmission path, effectively solving the problems of "limited elastic deformation capacity, only able to compensate for small displacements, and easy fatigue" of traditional compensators. This addresses the issue of "damage," extending the service life of the compensator while significantly improving vibration reduction, reducing duct resonance and wear caused by vibration, and lowering duct operating noise. By setting up a sealed connection structure between the sealing ring 5 and the multi-layer bellows assembly 2, during operation, when the inlet pipe 1, outlet pipe 3, and multi-layer bellows assembly 2 are connected, the sealing ring 5 tightly fills the joint gap. Furthermore, the high-temperature resistant sealing material adapts to different air transport environments within the duct, preventing seal failure due to temperature changes. Simultaneously, the structural sealing of the multi-layer bellows assembly 2, combined with the sealing ring 5, forms a double-seal protection, solving the problem of "insufficient sealing performance and easy air leakage" in traditional compensators. This prevents air leakage within the duct, ensuring the air transport efficiency of the duct system, while also blocking external impurities from entering the duct, preventing air quality from being affected.

[0037] The implementation principle of this application embodiment is as follows: First, the compensator and the two sections of the duct system are bolted together using the mounting holes on the inlet flange 6 at the end of the inlet pipe 1 and the outlet flange 7 at the end of the outlet pipe 3. During the connection process, the flexible sealing gasket 13 in the sealing gasket groove 12 on the end face of the inlet flange 6 and the outlet flange 7 will be squeezed and deformed, tightly filling the connection gap between the flange and the duct, realizing the initial sealing and stable assembly of the compensator and the duct. When the duct expands and contracts due to changes in ambient temperature, or when there is axial, lateral, or angular displacement due to installation errors, the multi-layer coaxial bellows body 201 in the multi-layer bellows assembly 2 will synchronously undergo corresponding changes due to the elastic characteristics of its own bellows structure. Deformation – During axial displacement, the bellows body 201 is stretched or compressed along the axial direction; during lateral displacement, the bellows body 201 bends and shifts to one side; during angular displacement, the bellows body 201 rotates slightly around the axis; simultaneously, the support 204 between adjacent bellows bodies 201 in the multi-layer bellows assembly 2 maintains a stable distance between the two bellows along the axial direction, avoiding friction between the two bellows or excessive spacing during deformation, ensuring synchronous deformation of the multi-layer bellows, accurately compensating for duct displacement, and preventing displacement stress from being transmitted to the duct and connected equipment; when the fan, pump, or other equipment connected to the duct vibrates during operation, the vibration is transmitted to the compensator through the duct; at this time, the buffer in the multi-layer bellows assembly 2... The elastic damping material 203 inside the cavity 202 deforms due to vibration, absorbing vibration energy. Simultaneously, the elastic damping material 203, fitted to the inner and outer walls of the bellows body 201, completely blocks the transmission path of vibration on the bellows body 201. Furthermore, the multi-layer structure of the multi-layer bellows assembly 2 weakens the noise generated when air flows within the duct, further reducing the operating noise of the duct system. During air transport, the sealing rings 5 ​​at the connections between the inlet pipe 1 and the multi-layer bellows assembly 2, and at the connections between the outlet pipe 3 and the multi-layer bellows assembly 2, tightly fill the gaps. Combined with the structural sealing of the multi-layer bellows assembly 2 itself, this forms a double seal, preventing air from entering the duct from entering through the gaps. Leakage at the connection point prevents external impurities from entering the duct; the high-temperature resistance of the sealing ring 5 allows it to adapt to different air transport environments within the duct, preventing sealing failure due to temperature changes; the protective sleeve 4 on the outer wall of the multi-layer corrugated pipe assembly 2 isolates external dust and impurities from corroding the corrugated pipe body 201, while also preventing damage to the corrugated pipe caused by accidental contact or external force; the anti-slip protrusions 10 on the inner wall of the protective sleeve 4 fit against the outer wall of the multi-layer corrugated pipe assembly 2, limiting the sliding of the protective sleeve 4 on the outer wall of the corrugated pipe assembly and ensuring a stable protective position; the anti-corrosion coating 9 on the inner wall of the inlet pipe 1 and outlet pipe 3 directly contacts the air transported within the duct, isolating corrosive components in the air from the inner wall of the pipe and preventing corrosion of the pipe;When high-temperature or low-temperature air is transported within the duct, the heat insulation sleeves 11 on the outer walls of the inlet pipe 1 and the outlet pipe 3 prevent the transfer of hot or cold energy from the pipe to the outside, avoiding the impact of abnormal temperatures on surrounding equipment and personnel, and reducing energy loss of the air inside the pipe. Furthermore, the reinforcing ribs 8 at the crests and troughs of the outer corrugated pipe body 201 of the multi-layer corrugated pipe assembly 2 disperse the localized stress generated during deformation along the circumferential direction, enhancing the structural load-bearing capacity of the outer corrugated pipe and preventing cracking or fatigue damage due to stress concentration.

Claims

1. A duct compensator with a multi-layer corrugated pipe structure, comprising an inlet pipe (1), a multi-layer corrugated pipe assembly (2), and an outlet pipe (3) connected in sequence, characterized in that: The two ends of the multi-layer corrugated pipe assembly (2) are respectively sealed to the inlet pipe (1) and the outlet pipe (3); the multi-layer corrugated pipe assembly (2) includes at least two coaxially arranged corrugated pipe bodies (201), and a closed buffer cavity (202) is formed between the two adjacent corrugated pipe bodies (201); the buffer cavity (202) is filled with elastic damping material (203), and the elastic damping material (203) is attached to the inner and outer walls of the two adjacent corrugated pipe bodies (201); the outer wall of the multi-layer corrugated pipe assembly (2) is fitted with a protective sleeve (4), the protective sleeve (4) is made of flexible wear-resistant material, and the two ends of the protective sleeve (4) are respectively fixedly connected to the inlet pipe (1) and the outlet pipe (3); the connection between the inlet pipe (1) and the multi-layer corrugated pipe assembly (2) and the connection between the outlet pipe (3) and the multi-layer corrugated pipe assembly (2) are provided with sealing rings (5), the sealing rings (5) are made of high temperature resistant sealing material.

2. A duct compensator with a multi-layer corrugated pipe structure according to claim 1, characterized in that: The inlet pipe (1) is provided with an inlet flange (6) at the end away from the multi-layer corrugated pipe assembly (2), and the outlet pipe (3) is provided with an outlet flange (7) at the end away from the multi-layer corrugated pipe assembly (2). Both the inlet flange (6) and the outlet flange (7) are provided with mounting holes for connecting to the air duct.

3. A duct compensator with a multi-layer corrugated pipe structure according to claim 1, characterized in that: The outer corrugated pipe body (201) of the multi-layer corrugated pipe assembly (2) is provided with reinforcing ribs (8) at both the crests and troughs, and the reinforcing ribs (8) are arranged along the circumferential direction of the outer corrugated pipe body (201).

4. A duct compensator with a multi-layer corrugated pipe structure according to claim 1, characterized in that: The inner walls of the inlet pipe (1) and the outlet pipe (3) are provided with anti-corrosion coating (9), which is made of corrosion-resistant paint.

5. A duct compensator with a multi-layer corrugated pipe structure according to claim 1, characterized in that: The inner wall of the protective sleeve (4) is provided with anti-slip protrusions (10), which are distributed at intervals along the length of the protective sleeve (4) and are in contact with the outer wall of the multi-layer corrugated pipe assembly (2).

6. A duct compensator with a multi-layer corrugated pipe structure according to claim 1, characterized in that: The outer walls of the inlet pipe (1) and the outlet pipe (3) are both fitted with heat insulation sleeves (11). The heat insulation sleeves (11) are made of high temperature heat insulation material, and the two ends of the heat insulation sleeves (11) extend to the ends of the inlet pipe (1) and the outlet pipe (3), respectively.

7. A duct compensator with a multi-layer corrugated pipe structure according to claim 1, characterized in that: In the multi-layer corrugated pipe assembly (2), a support member (204) is provided between two adjacent corrugated pipe bodies (201). The support member (204) is spaced apart along the axial direction of the corrugated pipe body (201), and the two ends of the support member (204) are fixedly connected to the inner wall and outer wall of the two adjacent corrugated pipe bodies (201), respectively.

8. A duct compensator with a multi-layer corrugated pipe structure according to claim 2, characterized in that: Both the inlet flange (6) and the outlet flange (7) are provided with sealing gasket grooves (12) and flexible sealing gaskets (13) are adapted to be installed in the sealing gasket grooves (12). The thickness of the flexible sealing gaskets (13) matches the depth of the sealing gasket grooves (12).

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