A high-strength constant air volume composite air duct system suitable for power control room

Abstract

The application belongs to the technical field of heating, ventilation and air conditioning, and particularly relates to a high-strength constant air volume composite air pipe system suitable for a power control room, which comprises a metal inner lining layer, a peripheral reinforcing layer and a gradient thermal expansion transition layer between the two, a sliding interface is embedded in the transition layer or the interface, the transition layer is composed of a high-molecular elastic matrix and radially non-uniformly distributed reinforcing fibers, a linear gradient transition of a thermal expansion coefficient is realized, the sliding interface contains arrayed friction-reducing microbeads, axial displacement compensation is allowed, the system is also integrated with a constant air volume control assembly to guarantee air volume accuracy, through the above structure, thermal stress concentration is effectively eliminated, cracks are inhibited, and air tightness and control stability are maintained.

Description

Technical Field

[0001] This invention belongs to the field of HVAC technology, specifically a high-intensity constant air volume composite duct system suitable for power control rooms. Background Technology

[0002] In the modern power industry, the power control room serves as the core hub for power grid dispatch and monitoring. It integrates a large number of precision electronic devices that are highly sensitive to temperature, humidity, and cleanliness. Therefore, it is equipped with a high-precision constant air volume (CAV) air circulation and regulation system. As the physical carrier of this system, the air duct needs to have sufficient mechanical strength and sealing reliability. The existing mainstream industrial composite air duct adopts a multi-layer design with a metal lining and fiber reinforcement layer. It has good mechanical properties under constant temperature and can resist structural flutter under large air volume. However, it has gradually revealed systemic performance degradation problems during long-term operation in the power control room.

[0003] The fundamental defect of existing composite ducts is the mismatch of thermophysical properties between heterogeneous materials, especially the discontinuous abrupt change in the coefficient of linear expansion (CTE) of the interface. Frequent temperature cycles in the power control room cause inconsistent volume expansion and contraction between the metal lining and the fiber reinforcement layer. The high stiffness of both leads to the inability to cancel out the displacement deviation, resulting in the accumulation of severe shear stress at the interface. This leads to fatigue of the adhesive layer, debonding of the interface, and the propagation of internal cracks in the composite material, which damages the airtightness of the duct and causes a surge in air leakage. Ultimately, this causes the constant air volume control system to fail, threatening the accuracy of the temperature control room.

[0004] Existing technologies alleviate stress by increasing the thickness of the interfacial adhesive, but this sacrifices structural compactness and is prone to causing new structural instability due to adhesive layer creep. The core challenge is to build a stress release gradient transition mechanism that can adapt to differences in thermal expansion while maintaining the high strength of the duct, so as to solve the constant air volume failure problem caused by interfacial shear fatigue.

[0005] Therefore, the present invention provides a high-strength constant air volume composite duct system suitable for power control rooms. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a high-strength constant air volume composite duct system suitable for power control rooms, comprising a metal inner lining layer, an outer reinforcement layer, and a gradient thermal expansion transition layer disposed between the metal inner lining layer and the outer reinforcement layer; a sliding interface is embedded inside the gradient thermal expansion transition layer or at its contact interface with adjacent structural layers.

[0008] Furthermore, the gradient thermal expansion transition layer is composed of a polymer elastic matrix and reinforcing fibers distributed within the polymer elastic matrix.

[0009] Furthermore, the distribution density of the reinforcing fibers in the polymer elastic matrix is ​​non-uniformly distributed along the radial direction of the duct, so that the coefficient of thermal expansion of the gradient thermal expansion transition layer transitions linearly from the metal inner liner side to the outer reinforcing layer side.

[0010] Furthermore, the sliding interface includes an array of friction-reducing microspheres, with some of the surface of the microspheres embedded in the gradient thermal expansion transition layer and the surface of another portion of the microspheres in contact with the peripheral reinforcement layer, forming a synergistic layer with axial displacement compensation function.

[0011] Furthermore, the reinforcing fibers in the gradient thermal expansion transition layer are short-cut high-modulus fibers, and the length direction of the reinforcing fibers is randomly oriented within the matrix.

[0012] Furthermore, the outer reinforcing layer is composed of a continuous fiber-wound reinforced composite material, and its elastic modulus is higher than that of the gradient thermal expansion transition layer.

[0013] Furthermore, the system also includes a constant air volume control component, which includes a flow monitoring module, a controller, and a flow adjustment terminal; the flow monitoring module is located at a specific position in the duct and is signal-connected to the controller; the controller drives the flow adjustment terminal according to the signal fed back by the flow monitoring module.

[0014] Furthermore, the metal inner liner, the gradient thermal expansion transition layer, and the outer reinforcement layer are constructed into an integrated pipeline structure through a hot pressing process.

[0015] Furthermore, the friction-reducing microspheres of the sliding interface are made of a wear-resistant polymer material with a low coefficient of friction.

[0016] Furthermore, a leak-proof sealing layer is provided between the metal liner and the gradient thermal expansion transition layer, and the leak-proof sealing layer is composed of a heat-resistant sealant layer.

[0017] Compared with existing technologies, this invention has the following advantages: By setting a gradient thermal expansion transition layer, this invention achieves physical matching and smooth transition of the thermal expansion coefficients between the metal liner and the composite material reinforcement layer, eliminating the interface shear stress concentration caused by thermal mismatch. By embedding a sliding interface between structural layers, while ensuring radial support strength, it allows the material to generate a small amount of thermal expansion displacement in the axial direction, effectively suppressing the initiation and propagation of microcracks. This structure fundamentally solves the interface debonding problem of composite ducts under frequent temperature change loads, maintains the long-term airtightness of the duct system, eliminates the interference of uncontrolled air leakage on the constant air volume control accuracy, and ensures the stability and reliability of the power control room environmental control system. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a structural block diagram of a high-intensity constant air volume composite duct system suitable for power control rooms according to the present invention;

[0020] Figure 2 This is a flowchart of the internal control logic of the controller in this invention. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figure 1 As shown in the embodiment of the present invention, a high-strength constant air volume composite duct system suitable for power control rooms includes a metal inner lining layer, a leak-proof sealing layer, a gradient thermal expansion transition layer, a sliding interface, and an outer reinforcement layer.

[0023] As the innermost layer that directly contacts the conveyed medium, the metal liner serves as a fundamental airtight barrier. The metal liner is preferably made of thin metal sheets with excellent corrosion resistance and good electrical conductivity, such as stainless steel or rust-resistant aluminum alloy. In the environment of a power control room, the metal liner not only provides absolute physical isolation, preventing moisture or trace amounts of corrosive gases from penetrating into the composite layer, but also acts as electromagnetic shielding, reducing the impact of external electromagnetic interference on the airflow monitoring sensors within the duct.

[0024] A leak-proof sealing layer is tightly bonded to the outside of the metal liner. This sealing layer consists of a heat-resistant sealant layer with high elongation at break and excellent adhesive strength. The purpose of this leak-proof sealing layer is to ensure that even under extreme temperature fluctuations and minute deformations in the metal liner, the sealing layer can fill any microscopic gaps that may appear at the interface through its own elastic deformation. This leak-proof sealing layer tightly couples the metal liner to the subsequent gradient thermal expansion transition layer, ensuring a very high level of airtightness even under pressure fluctuations, thus solving the problem of air leakage at joints in traditional ductwork.

[0025] The gradient thermal expansion transition layer, located between the metal inner liner and the outer reinforcing layer, is essentially a functional material with a gradient distribution of physical properties. It consists of a polymeric elastic matrix and reinforcing fibers distributed within the matrix. The polymeric elastic matrix is ​​typically made of modified epoxy resin or polyurethane, which possesses good toughness and heat resistance. These materials can absorb internal stresses generated by thermal expansion within a certain range. The reinforcing fibers, on the other hand, regulate the material's coefficient of thermal expansion and enhance its mechanical strength.

[0026] To achieve a smooth transition in the coefficient of thermal expansion, the distribution density of reinforcing fibers within the polymer elastic matrix of the gradient thermal expansion transition layer is non-uniform along the radial direction of the duct. Specifically, on the side closer to the metal liner, the distribution density of reinforcing fibers is set to a lower or specific ratio, so that the coefficient of thermal expansion on this side matches or is close to that of the metal liner. As the radial position moves towards the outer reinforcing layer, the distribution density of reinforcing fibers gradually increases or exhibits a specific gradient change, thus ensuring a linear gradient transition in the overall coefficient of thermal expansion of the gradient thermal expansion transition layer from the metal liner side to the outer reinforcing layer side. This gradient design significantly alleviates the abrupt stress at the interface of heterogeneous materials, dispersing the shear force originally concentrated on a single interface throughout the entire gradient layer, thereby effectively preventing interface debonding.

[0027] Furthermore, the reinforcing fibers in the gradient thermal expansion transition layer are chopped high-modulus fibers. These chopped high-modulus fibers exhibit a three-dimensional random orientation distribution along their length within the matrix. The advantage of this random orientation distribution is that it endows the gradient thermal expansion transition layer with nearly uniform mechanical properties and thermal response characteristics in all directions, exhibiting isotropic characteristics. When the duct is subjected to radial expansion forces from internal air pressure and axial expansion forces from temperature differences, the randomly distributed chopped high-modulus fibers can block the propagation path of microcracks in multiple dimensions, improving the fracture toughness of the material.

[0028] At the interface between the gradient thermal expansion transition layer and the outer reinforcing layer, or inside the outer edge of the gradient thermal expansion transition layer, this invention scientifically embeds a sliding interface. The sliding interface is a key structural feature of this invention for solving axial thermal stress release. The sliding interface comprises an array of anti-friction microspheres. These microspheres are made of wear-resistant and low-friction-coefficient polymer materials, such as polytetrafluoroethylene (PTFE) or ultra-high molecular weight polyethylene (UHMWPE). The structural morphology of the anti-friction microspheres is characterized in that part of their spherical surface is firmly embedded within the gradient thermal expansion transition layer, while another part of their spherical surface remains in contact with the outer reinforcing layer.

[0029] This embedded distribution forms a synergistic layer with axial displacement compensation. Its working principle is as follows: when the duct system experiences a drastic temperature rise, the metal liner and the gradient thermal expansion transition layer tend to elongate axially due to heat. At this time, because the outer reinforcement layer has a high elastic modulus and strong structural constraint, if the two are rigidly connected, a huge axial shear stress will be generated. Through the anti-friction microspheres at the sliding interface, the gradient thermal expansion transition layer can generate an extremely small axial relative displacement with respect to the outer reinforcement layer at a microscale. This small displacement does not compromise the overall stability of the structure, but it provides an effective release channel for thermal expansion, similar to setting countless miniature "bearings" inside the material. This design not only ensures radial support strength, ensuring that the duct does not burst under high pressure, but also allows for free axial expansion and contraction, completely solving the structural cracking problem caused by thermal mismatch.

[0030] The outer reinforcement layer, serving as the primary load-bearing structure of the duct system, is composed of continuously wound reinforced composite materials. Continuous fibers, such as glass fiber or carbon fiber, are uniformly wrapped around the outermost layer of the system at a predetermined winding angle. The elastic modulus of the outer reinforcement layer is set to be higher than that of the gradient thermal expansion transition layer. This allows the outer reinforcement layer to act like a robust suit of armor, constraining the deformation of the inner layer and protecting the duct from damage caused by external mechanical impacts.

[0031] To achieve the precise constant air volume control required by the power control room, the system also integrates a sophisticated constant air volume control component. This component includes a flow monitoring module, a controller, and flow regulation terminals. The flow monitoring module is installed at a specific location in the duct to collect real-time data on airflow velocity and pressure within the duct. The flow monitoring module converts the collected physical signals into electrical signals and transmits them to the controller.

[0032] like Figure 2 As shown, the internal logic operation of the controller is as follows: The controller first receives the real-time flow signal from the flow monitoring module, then compares the real-time flow signal with the preset target flow value, and calculates the flow deviation value between the two. The controller uses a control algorithm based on proportional-integral-derivative (PID) logic to process the flow deviation value. Specifically, the controller multiplies the flow deviation value by the proportional coefficient to obtain the proportional term, multiplies the cumulative integral of the flow deviation value over time by the integral coefficient to obtain the integral term, and multiplies the rate of change of the flow deviation value by the derivative coefficient to obtain the derivative term. The controller adds the proportional term, integral term, and derivative term to calculate the adjustment increment of the output control command.

[0033] Subsequently, the controller sends a drive command to the flow regulation terminal based on the calculated adjustment increment. The flow regulation terminal is typically a high-performance electric damper. Upon receiving the command, the drive motor of the flow regulation terminal precisely adjusts the opening angle of the valve. If the real-time flow is lower than the target flow, the controller increases the valve opening; if the real-time flow is higher than the target flow, the controller decreases the valve opening. Because the duct system described in this invention has extremely high airtightness and structural stability, eliminating the risk of accidental air leakage due to structural cracks, every command output by the controller can produce the expected flow change, greatly improving the accuracy and response speed of constant air volume control.

[0034] In terms of manufacturing process, the metal inner liner, gradient thermal expansion transition layer, and outer reinforcing layer are constructed into an integrated pipeline structure through hot pressing. During the hot pressing process, by controlling the temperature profile and pressure gradient of the mold, the resin matrix between each layer undergoes a full cross-linking reaction, forming molecular-level penetration and bonding. In particular, the friction-reducing microspheres in the sliding interface are partially squeezed into the incompletely cured gradient thermal expansion transition layer matrix during hot pressing. After curing, a stable semi-embedded structure is formed, ensuring the long-term effectiveness of the sliding function.

[0035] The technical solution of the present invention will be illustrated with data through specific implementation examples below.

[0036] Example 1

[0037] This embodiment is designed for a standard medium-sized power control room. The metal liner is made of 0.5 mm thick stainless steel. The leak-proof sealing layer uses 0.2 mm thick high-performance silicone sealant. The gradient thermal expansion transition layer is 5 mm thick, with bisphenol A type epoxy resin as its polymer elastic matrix and 3 mm long chopped glass fibers as reinforcing fibers. On the side near the metal liner, the chopped glass fibers account for 15% of the mass, while on the side near the outer reinforcing layer, the mass percentage gradually increases to 45% through five layers, thus achieving a smooth transition in the coefficient of thermal expansion from 16 parts per million to 7 parts per million. The friction-reducing microspheres in the slip interface are 0.3 mm diameter polytetrafluoroethylene microspheres with a distribution density of 50 per square centimeter. The outer reinforcing layer is made of continuous glass fibers wound at a 60-degree angle, with a thickness of 3 mm.

[0038] In this embodiment, after the duct system underwent 1,000 cycles of hot and cold cycling from -20°C to 60°C, no signs of delamination were found between the lining and the composite layer, and the system's air leakage rate remained below 0.05 cubic meters per square meter per hour, which is far superior to the national standard.

[0039] Example 2

[0040] This embodiment is designed for power equipment rooms in extreme high temperature and humidity environments. The metal liner uses a corrosion-resistant aluminum alloy plate with a thickness of 0.8 mm. The gradient thermal expansion transition layer uses modified polyurethane as the matrix to enhance its flexibility. The reinforcing fibers are high-modulus chopped carbon fibers with a length of 2 mm. The fiber distribution gradient is steeper, rapidly increasing from 10% distribution density near the liner side to 50% on the outer side, to match the high thermal expansion coefficient of the aluminum alloy. The diameter of the anti-friction microspheres at the slip interface is increased to 0.5 mm, and an extremely thin molybdenum disulfide lubricating film is pre-coated on the surface of the anti-friction microspheres to further reduce the coefficient of friction.

[0041] Experimental data show that the duct system of Example 2 exhibits excellent dimensional stability under high-temperature conditions. The feedback deviation of the constant air volume control component during system operation remains within two percent of the preset flow rate value. Due to the presence of the sliding interface, the axial internal stress caused by thermal expansion and contraction is reduced by more than seventy percent.

[0042] Example 3

[0043] This embodiment relates to a large-diameter main composite duct system. Due to the increased duct diameter, extremely high radial strength is required. The thickness of the outer reinforcing layer is increased to six millimeters, and a hybrid winding method of carbon fiber and glass fiber is adopted. The thickness of the gradient thermal expansion transition layer is increased to ten millimeters. To ensure the accuracy of the gradient of the reinforcing fibers in the thickness direction, a layered spraying combined with electrostatic fiber implantation process is adopted, resulting in a perfect linear growth curve of fiber density. The sliding interface uses a double-layer array of anti-friction microspheres, with the two layers of microspheres separated by an ultra-thin polymer film, forming a multi-level sliding structure.

[0044] The system demonstrated exceptional structural integrity in a simulated high-temperature test simulating a short-circuit fire in a power control room. Despite the dramatic thermal expansion of the inner metal layer, the outer composite material did not crack or experience significant interlaminar shear failure due to the synergistic compensation of the gradient layer and slip interface, ensuring the safety of smoke extraction and ventilation under accident conditions.

[0045] Comparative Example 1

[0046] Comparative Example 1 uses a traditional pure metal duct (stainless steel) and lacks a composite layer, gradient thermal expansion transition layer, and sliding interface. Under the same hot and cold cycling conditions, Comparative Example 1, due to the extremely high thermal conductivity of the metal material, experiences drastic temperature changes between the inside and outside of the duct wall, causing the sealing gaskets at the duct connections to age and fail rapidly. After one thousand cycles, the air leakage at the connections increased threefold. Furthermore, due to the poor damping characteristics of the metal duct, the vibration generated by the fan operation results in extremely high signal noise in the flow monitoring module of the constant air volume control component, leading to a flow regulation error as high as 15%.

[0047] Comparative Example 2

[0048] Comparative Example 2 uses a conventional double-layer composite duct, which consists of a metal inner liner directly covered with a layer of fiber-reinforced plastic of a fixed composition. This structure lacks a gradient thermal expansion transition layer and a sliding interface. In the hot and cold cycling test, after only fifty cycles, noticeable peeling sounds appeared between the metal inner liner and the composite layer. Disassembly revealed a large area of ​​debonding at the interface. Due to the mismatch in thermal expansion coefficients, multiple visible longitudinal cracks appeared on the surface of the composite layer, leading to a loss of airtightness. The constant air volume control system frequently alarmed and shut down because it could not establish effective feedback pressure.

[0049] Comparative Example 3

[0050] Comparative Example 3 incorporated a gradient thermal expansion transition layer but did not embed a sliding interface at the interface. While the gradient layer alleviated interlayer stress to some extent, the lack of an axial displacement compensation mechanism led to slight serpentine bending deformation of the duct system under axial expansion and contraction. This geometric change disrupted the flow field within the duct, rendering the data collected by the flow monitoring module inaccurate. During long-term operational testing, the duct flange connection underwent metal fatigue fracture due to excessive stress caused by the long-term accumulation of axial stress.

[0051] By quantitatively comparing the performance indicators of the above embodiments and comparative examples, the technical advantages of the present invention can be clearly seen.

[0052] The table below shows a comparison of the comprehensive performance test data of each scheme in a simulated power control room environment:

[0053] Test Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Interfacial peel strength (Newtons per square millimeter) 18.5 19.2 20.1 not applicable 3.2 12.4 Air leakage rate (cubic meters per hour per square meter) after 1000 heat cycles 0.04 0.03 0.05 0.85 2.10 0.45 Constant air volume adjustment accuracy deviation (percentage) 1.2 0.8 1.5 15.2 22.0 8.5 Axial residual stress value (megapascals) 2.1 1.8 2.5 45.0 58.0 22.0 Structural service life prediction (years) 30 35 30 10 3 12

[0054] Analysis of the data in the table above shows that the system described in this invention far surpasses ordinary composite solutions in terms of critical interface peel strength. This is directly attributed to the design of the gradient thermal expansion transition layer, which effectively dilutes the destructive stress peaks physically. Regarding air leakage rate and adjustment accuracy, this invention solves the structural deformation problem caused by axial thermal stress through a sliding interface, ensuring the stability and airtightness of the duct geometry, thereby providing stable physical boundary conditions for the constant airflow control components. In contrast, comparative solutions lacking these core features exhibit severe performance degradation or structural damage during long-term operation.

[0055] In summary, this invention, through the synergistic innovation of a multi-layered composite structure, utilizes the properties of gradient materials to smooth thermal stress, achieves displacement compensation through a sliding interface, and combines precise automatic control logic to provide a highly reliable, high-precision, and long-life air supply solution for power control rooms. Those skilled in the art can reproduce and apply this system based on the disclosed structural parameters and logical steps, combined with specific engineering requirements.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength constant air volume composite duct system suitable for power control rooms, characterized in that, The system includes: A metal liner layer, which forms the innermost sealing barrier of the system, is used to provide physical isolation and electromagnetic shielding. An outer reinforcement layer, which is disposed on the outermost layer of the system, is used to provide radial support stiffness and constrain the mechanical deformation of the overall structure; A gradient thermal expansion transition layer is disposed between the metal inner liner and the outer reinforcement layer. The coefficient of thermal expansion of the gradient thermal expansion transition layer forms a gradient physical transition between the metal inner liner and the outer reinforcement layer to eliminate interfacial stress caused by the mismatch of the coefficients of thermal expansion of the materials. And a sliding interface, which is disposed inside the gradient thermal expansion transition layer or on the contact interface between the gradient thermal expansion transition layer and the peripheral reinforcement layer, the sliding interface being configured to allow the gradient thermal expansion transition layer and the peripheral reinforcement layer to generate relative displacement in the axial direction to compensate for the axial thermal stress generated by temperature difference cycling.

2. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 1, characterized in that, The gradient thermal expansion transition layer includes a polymeric elastic matrix and reinforcing fibers distributed within the polymeric elastic matrix; the polymeric elastic matrix is ​​composed of a viscoelastic polymer material and is used to absorb local stress within the gradient thermal expansion transition layer; the reinforcing fibers are used to adjust the coefficient of thermal expansion of the gradient thermal expansion transition layer at different radial positions.

3. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 2, characterized in that, The distribution density of the reinforcing fibers inside the polymer elastic matrix is ​​non-uniform along the radial direction of the system. On the side near the metal liner, the distribution density of the reinforcing fibers is set to match the thermal expansion coefficient of the region with that of the metal liner; on the side near the outer reinforcement layer, the distribution density of the reinforcing fibers is higher than that on the side near the metal liner, so that the overall thermal expansion coefficient of the gradient thermal expansion transition layer exhibits a linear gradient decrease from the metal liner to the outer reinforcement layer, thereby constructing a smooth transition mechanism of thermal expansion properties at the physical level.

4. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 1, characterized in that, The sliding interface includes friction-reducing particles distributed in an array; part of the spherical surface of the friction-reducing particles is embedded in the edge region of the gradient thermal expansion transition layer, and another part of the spherical surface of the friction-reducing particles maintains sliding contact with the inner surface of the peripheral reinforcement layer, thereby forming a synergistic layer with axial displacement compensation function between the gradient thermal expansion transition layer and the peripheral reinforcement layer.

5. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 2, characterized in that, The reinforcing fiber is a short-cut high-modulus fiber, and the length direction of the reinforcing fiber is randomly oriented within the polymer elastic matrix, so that the gradient thermal expansion transition layer exhibits isotropic mechanical and thermal response characteristics in the radial and axial directions, thereby inhibiting the initiation and propagation of cracks in all directions.

6. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 1, characterized in that, The outer reinforcing layer is composed of a continuous fiber-wound reinforced composite material, and the elastic modulus of the outer reinforcing layer is higher than that of the gradient thermal expansion transition layer; the outer reinforcing layer constrains the overall deformation of the system through a high-strength fiber skeleton.

7. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 1, characterized in that, The system also includes a leak-proof sealing layer disposed between the metal liner and the gradient thermal expansion transition layer. The leak-proof sealing layer is made of a heat-resistant sealant material and is used to fill the local gap between the metal liner and the gradient thermal expansion transition layer through the elastic deformation of the heat-resistant sealant material, so as to maintain the long-term airtightness of the system.

8. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 1, characterized in that, The system also includes a constant air volume control component, which includes a flow monitoring module, a controller, and a flow regulation terminal. The flow monitoring module is installed inside the pipeline of the system to collect the physical state parameters of the airflow in real time and convert the physical state parameters into flow signals. The controller is signal-connected to the flow monitoring module and is used to receive the flow signal and calculate adjustment instructions; The flow regulation terminal is connected to the controller signal and is used to adjust the output air volume of the system according to the regulation command.

9. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 8, characterized in that, The controller internally operates control logic based on deviation adjustment, and the specific steps of the control logic are as follows: The first step is for the controller to compare the received real-time flow signal with the preset target flow value and calculate the flow deviation value. The second step involves the controller processing the flow deviation value, including: Multiply the flow deviation value by a scaling factor to obtain the scaling treatment term; The cumulative integral of the flow deviation value over time is multiplied by the integration coefficient to obtain the integral processing term; Multiply the real-time rate of change of the flow deviation value by the differential coefficient to obtain the differential processing term; Third, the controller adds the proportional processing term, the integral processing term, and the derivative processing term to calculate the adjustment increment of the output control command; Fourth, the controller drives the flow regulation terminal according to the adjustment increment, and eliminates the flow deviation value by changing the opening degree of the flow regulation terminal.

10. A high-intensity constant air volume composite duct system suitable for power control rooms according to claim 1, characterized in that, The metal inner liner, the gradient thermal expansion transition layer, and the outer reinforcement layer are constructed into an integrated structure through a hot pressing process. The friction-reducing particles in the sliding interface are made of a polymer material with a low coefficient of friction, and the friction-reducing particles are partially pressed into the matrix material of the gradient thermal expansion transition layer during the hot pressing process, thereby forming a fixed semi-embedded support structure. The metal liner, the gradient thermal expansion transition layer, and the outer reinforcement layer achieve physical and chemical bonding between the layers through the cross-linking reaction of the matrix material during hot pressing.

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