Anti-freezing heating and ventilation pipeline structure in severe cold area

Abstract

The utility model discloses an anti-freezing heating and ventilation pipeline structure in severe cold areas, which comprises an inner-layer metal main pipeline, an outer-layer metal main pipeline and an outer-layer metal main pipeline, the outer wall of the main pipeline is coated with the nanometer aerogel heat preservation layer; the self-temperature-limiting heat tracing band is spirally wound outside the heat preservation layer; the high-density polyethylene protection layer covers the heat tracing band; the aluminum foil reflecting film and the UV protective coating are arranged on the outermost layer; and the plurality of drain valves are uniformly distributed on the inner-layer metal main pipeline. Triple anti-freezing protection (nano aerogel heat preservation, the intelligent heat tracing band and the drain valve) is adopted to ensure that the pipeline can still operate normally at the extremely low temperature of-50 DEG C, and the problem that a traditional pipeline is prone to frost cracking is thoroughly solved. Triple anti-freezing protection (nano aerogel heat preservation, an intelligent heat tracing band and a drain valve) ensures that the pipeline can still operate normally at the extremely low temperature of-50 DEG C, and the problem that a traditional pipeline is prone to frost cracking is thoroughly solved.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning (HVAC) engineering technology, specifically to a freeze-resistant HVAC pipe structure for extremely cold regions. Background Technology

[0002] In frigid regions (such as high-latitude or high-altitude areas), HVAC ducts often experience freezing of their internal media (such as water, steam, or antifreeze) due to extreme low temperatures, leading to pipe bursts and system failures. Traditional antifreeze measures typically employ a single insulation layer or electric heating tape, but these methods have the following drawbacks:

[0003] Insufficient thermal insulation: Ordinary insulation materials (such as rubber and plastic, glass wool) have high thermal conductivity and cannot effectively prevent heat loss; Uneven heat tracing: The heat tracing tape has low control precision, which can easily cause local overheating or heat tracing blind spots. Poor weather resistance: The outer layer protection is insufficient, and long-term exposure to low temperature and ultraviolet radiation can easily lead to aging.

[0004] Therefore, there is an urgent need for a heating, ventilation and air conditioning (HVAC) duct structure that combines high-efficiency insulation, intelligent heat tracing, rapid drainage, and strong weather resistance. Utility Model Content

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a freeze-resistant HVAC duct structure for extremely cold regions, comprising,

[0006] Inner metal main pipe;

[0007] A nano-aerogel insulation layer covering the outer wall of the main pipeline;

[0008] A self-regulating heat tracing cable spirally wound around the outside of the insulation layer;

[0009] A high-density polyethylene protective layer covering the heat tracing tape;

[0010] The outermost aluminum foil reflective film and UV protective coating;

[0011] Multiple drain valves are evenly distributed on the inner metal main pipe.

[0012] Furthermore, the thickness of the nano-aerogel insulation layer is 15-25 mm, and the thermal conductivity is ≤0.02 W / (m·K).

[0013] Furthermore, the self-regulating heating tape is connected to a temperature control system, and the trigger temperature is adjustable from -5℃ to 0℃.

[0014] Furthermore, the temperature control system adopts a distributed temperature sensor network, with a digital temperature sensor arranged every 20-30 meters of pipeline to monitor the temperature of the outer wall of the pipeline in real time. The digital temperature sensor is a PT100 model.

[0015] The advantages of the utility model compared to the prior art are:

[0016] 1. Excellent antifreeze properties

[0017] Triple antifreeze protection (nano aerogel insulation, intelligent heating tape, and drain valve) ensures that the pipeline can still operate normally at extreme low temperatures of -50℃, completely solving the problem of traditional pipelines being prone to freezing and cracking.

[0018] The self-regulating heating cable (PTC material) combined with the PID temperature control system precisely adjusts the heating power to avoid local overheating or insufficient heating, improving antifreeze reliability by more than 90%.

[0019] 2. Superior heat insulation, significantly reducing heat loss.

[0020] Nano-aerogel insulation (thermal conductivity ≤0.02W / (m·K)) reduces heat loss by more than 50% compared to traditional rubber / plastic / glass wool insulation materials, significantly improving energy efficiency. Aluminum foil reflective film effectively blocks radiative heat loss, enabling pipelines to maintain a stable medium temperature even in extremely cold environments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a freeze-resistant HVAC duct structure for extremely cold regions according to the present invention;

[0022] Figure 2 This is a front view of a freeze-resistant HVAC duct structure for extremely cold regions according to this utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of HVAC ductwork.

[0024] The components include: 1. Inner metal main pipe; 2. Nano-aerogel insulation layer; 3. Self-regulating heat tracing tape; 4. High-density polyethylene protective layer; 5. UV protective coating; 6. Drain valve; and 7. Aluminum foil reflective film. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] The present invention will be described in detail with reference to the accompanying drawings.

[0027] In its specific implementation, this utility model provides a freeze-resistant HVAC duct structure for extremely cold regions, including:

[0028] Inner metal main pipe 1;

[0029] 2. Nano-aerogel insulation layer covering the outer wall of the main pipeline;

[0030] 3. A self-regulating heat tracing cable spirally wound around the outside of the insulation layer;

[0031] 4. High-density polyethylene protective layer covering the heat tracing cable;

[0032] The outermost aluminum foil reflective film and UV protective coating 5;

[0033] Multiple drain valves 6 are evenly distributed on the inner metal main pipe 1.

[0034] Example:

[0035] I. Pipeline Assembly:

[0036] First, a nano-aerogel insulation layer 2 is wrapped around the outer wall of the inner metal main pipe 1;

[0037] A spiral-wound self-limiting heat tracing tape 3 is connected to the temperature control system;

[0038] 4. Cover with a high-density polyethylene protective layer, and finally wrap with an aluminum foil reflective film and a UV coating 5.

[0039] II. Drain valve installation:

[0040] Install inclined drain valves at the lowest point of the pipeline or every 5-8 meters to ensure that the liquid is completely drained when the machine is stopped.

[0041] III. Control System Debugging:

[0042] Configure a temperature sensor network and adjust the PID parameters to enable the heat tracing cable to start at -5℃ and shut down at 0℃.

[0043] To improve the thermal insulation performance of the pipeline, the thickness of the nano-aerogel insulation layer 2 is 15-25mm, and the thermal conductivity is ≤0.02W / (m·K).

[0044] To facilitate temperature control of the self-regulating heating cable, the self-regulating heating cable 3 is connected to the temperature control system, and the trigger temperature is adjustable from -5℃ to 0℃.

[0045] To facilitate temperature monitoring of the pipe's outer wall, the temperature control system employs a distributed temperature sensor network, with a digital temperature sensor installed every 20-30 meters of pipe to monitor the pipe's outer wall temperature in real time. The digital temperature sensor is a PT100 model.

[0046] To improve temperature control accuracy, the temperature control system adopts a central controller with integrated PID algorithm to dynamically adjust the power output of the heating cable based on sensor feedback, achieving a temperature difference control accuracy of ±0.5℃.

[0047] As a further description of this utility model, the self-regulating heating cable is a parallel self-regulating heating cable of type 3, wherein the self-regulating heating cable is made of PTC material, has a rated power of 25-40W / m, and a maximum surface temperature of 70℃.

[0048] As a further explanation of this utility model, the outer surface of the aluminum foil reflective film 7 is coated with a polyurethane UV protective coating. The function of the polyurethane UV protective coating is as follows:

[0049] 1. Resistant to ultraviolet (UV) aging

[0050] Blocking ultraviolet radiation: The polyurethane coating can effectively absorb or reflect ultraviolet rays (UV-A / UV-B) in sunlight, preventing the aluminum foil reflective film and polyethylene protective layer from becoming brittle and cracked due to long-term exposure, thus extending the life of the outer protective layer of the pipeline.

[0051] Preventing material degradation: Ultraviolet light can break the chemical bonds of polymer materials, causing the outer protective layer to chalk and discolor. Polyurethane coatings can slow down this process, maintaining the pipe's appearance and mechanical properties.

[0052] 2. Enhanced weather resistance

[0053] Resistance to extreme temperatures: The polyurethane coating remains flexible in the range of -40℃ to 80℃, preventing the coating from cracking in cold environments or softening and peeling off at high temperatures.

[0054] Moisture and corrosion resistant: The dense coating structure can block the corrosion of rain, snow, frost, salt spray and other substances, and prevent metal parts (such as drain valves and fasteners) from rusting. It is especially suitable for high humidity or coastal areas.

[0055] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A freeze-resistant HVAC duct structure for extremely cold regions, characterized in that: include, Inner metal main pipe (1); Nano-aerogel insulation layer covering the outer wall of the main pipe (2); A self-regulating heat tracing cable spirally wound around the outside of the insulation layer (3); High-density polyethylene protective layer covering the heat tracing cable (4); The outermost aluminum foil reflective film and UV protective coating (5); Multiple drain valves (6) are evenly distributed on the inner metal main pipe (1).

2. The frost-resistant HVAC duct structure for extremely cold regions according to claim 1, characterized in that: The thickness of the nano-aerogel insulation layer (2) is 15-25 mm, and the thermal conductivity is ≤0.02 W / (m·K).

3. The frost-resistant HVAC duct structure for extremely cold regions according to claim 1, characterized in that: The self-regulating heating cable (3) is connected to the temperature control system, and the trigger temperature is adjustable from -5℃ to 0℃.

4. The frost-resistant HVAC duct structure for extremely cold regions according to claim 3, characterized in that: The temperature control system adopts a distributed temperature sensor network, with a digital temperature sensor installed every 20-30 meters of pipeline to monitor the temperature of the outer wall of the pipeline in real time. The digital temperature sensor is a PT100 model.

5. The frost-resistant HVAC duct structure for extremely cold regions according to claim 4, characterized in that: The temperature control system adopts a central controller with integrated PID algorithm, which dynamically adjusts the power output of the heat tracing cable based on sensor feedback, and the temperature difference control accuracy is ±0.5℃.

6. The frost-resistant HVAC duct structure for extremely cold regions according to claim 1, characterized in that: The self-regulating heating cable (3) is a parallel self-regulating heating cable. The self-regulating heating cable is made of PTC material, with a rated power of 25-40W / m and a maximum surface temperature of 70℃.

7. The frost-resistant HVAC duct structure for extremely cold regions according to claim 1, characterized in that: The outer surface of the aluminum foil reflective film (7) is coated with a polyurethane UV protective coating.

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