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CN-224229454-U - Freezing-resistant heating and ventilation pipeline structure in severe cold region

CN224229454UCN 224229454 UCN224229454 UCN 224229454UCN-224229454-U

Abstract

The utility model discloses an anti-freezing heating and ventilation pipeline structure in severe cold areas, which comprises an inner metal main pipeline, a nano aerogel heat preservation layer coated on the outer wall of the main pipeline, a self-limiting heat tracing belt spirally wound outside the heat preservation layer, a high-density polyethylene protection layer covering the heat tracing belt, an aluminum foil reflection film and a UV protection coating on the outermost layer, and a plurality of drain valves uniformly distributed on the inner metal main pipeline. The utility model adopts triple anti-freezing protection (nano aerogel heat preservation, intelligent heat tracing belt and drain valve) to ensure that the pipeline can still normally run at the extremely low temperature of-50 ℃ and thoroughly solve the problem that the traditional pipeline is easy to frost crack. Triple anti-freezing protection (nano aerogel heat preservation, intelligent heat tracing belt and drain valve) ensures that the pipeline can still normally run at the extremely low temperature of-50 ℃, and thoroughly solves the problem that the traditional pipeline is easy to frost crack.

Inventors

  • HAN DONG

Assignees

  • 韩冬

Dates

Publication Date
20260512
Application Date
20250630

Claims (7)

  1. 1. An antifreeze heating and ventilation pipeline structure in severe cold areas is characterized by comprising, An inner metal main pipe (1); the nanometer aerogel heat insulation layer (2) is coated on the outer wall of the main pipeline; a self-limiting heat tracing band (3) spirally wound outside the heat-insulating layer; a high-density polyethylene protective layer (4) covering the heat tracing band; an aluminum foil reflecting film and a UV protective coating (5) at the outermost layer; The plurality of drain valves (6) are uniformly distributed on the inner metal main pipeline (1).
  2. 2. The antifreeze heating and ventilation pipeline structure in severe cold areas of claim 1, wherein the thickness of the nano aerogel heat preservation layer (2) is 15-25mm, and the heat conductivity coefficient is less than or equal to 0.02W/(m.K).
  3. 3. The antifreeze heating and ventilation pipeline structure in severe cold areas according to claim 1 is characterized in that the self-temperature-limiting heat tracing belt (3) is connected with a temperature control system, and the triggering temperature is adjustable from-5 ℃ to 0 ℃.
  4. 4. The antifreeze heating and ventilation pipeline structure in severe cold areas of claim 3, wherein the temperature control system adopts a distributed temperature sensing network, a digital temperature sensor is arranged in each 20-30 m pipeline, the temperature of the outer wall of the pipeline is monitored in real time, and the model of the digital temperature sensor is PT 100.
  5. 5. The antifreeze heating and ventilation pipeline structure in severe cold regions of claim 4, wherein the temperature control system adopts a central controller integrated PID algorithm, dynamically adjusts power output of heat tracing bands according to sensor feedback, and has temperature difference control precision of +/-0.5 ℃.
  6. 6. The antifreeze heating and ventilation pipeline structure in severe cold areas, as claimed in claim 1, is characterized in that the self-limiting temperature heat tracing belt (3) is a parallel self-limiting temperature tracing belt, the self-limiting temperature tracing belt is a PTC material, the rated power is 25-40W/m, and the highest surface temperature is 70 ℃.
  7. 7. The antifreeze heating and ventilation pipeline structure in severe cold areas according to claim 1 is characterized in that the outer surface of the aluminum foil reflecting film (7) is coated with a polyurethane UV protective coating.

Description

Freezing-resistant heating and ventilation pipeline structure in severe cold region Technical Field The utility model relates to the technical field of heating and ventilation engineering, in particular to an anti-freezing heating and ventilation pipeline structure in a severe cold region. Background In severe cold areas (such as high latitude or high altitude areas), the warm-through pipeline is often frozen by internal media (such as water, steam or antifreeze solution) caused by extremely low temperature, so that the problems of pipeline expansion, system paralysis and the like are caused. Conventional antifreeze measures usually employ a single insulation layer or an electric tracing band, but have the following problems: The heat insulation performance is insufficient, the heat conductivity coefficient of the common heat insulation material (such as rubber plastic and glass wool) is high, heat dissipation cannot be effectively prevented, and uneven heat tracing is caused by low control precision of heat tracing bands, so that local overheating or heat tracing blind areas are easy to cause. Poor weather resistance, insufficient protection of the outer layer and easy aging after long-term exposure to low temperature and ultraviolet environment. Therefore, a heating and ventilation pipeline structure with high efficiency of heat preservation, intelligent heat tracing, rapid drainage and strong weather resistance is needed. Disclosure of utility model In order to solve the technical problems, the utility model provides a freezing-resistant heating and ventilation pipeline structure in severe cold areas, which comprises, An inner metal main pipe; the nanometer aerogel heat insulation layer is coated on the outer wall of the main pipeline; Self-limiting heat tracing band spirally wound outside the heat preservation layer; A high-density polyethylene protective layer covering the heat tracing band; an outermost aluminum foil reflective film and a UV protective coating; the drain valves are uniformly distributed on the inner metal main pipeline. Further, the thickness of the nano aerogel heat preservation layer is 15-25mm, and the heat conductivity coefficient is less than or equal to 0.02W/(m.K). Further, the self-temperature-limiting heat tracing belt is connected with a temperature control system, and the trigger temperature is adjustable from-5 ℃ to 0 ℃. Further, the temperature control system adopts a distributed temperature sensing network, a digital temperature sensor is arranged in each 20-30 m pipeline, the temperature of the outer wall of the pipeline is monitored in real time, and the model of the digital temperature sensor is PT 100. Compared with the prior art, the utility model has the advantages that: 1. excellent freezing resistance Triple anti-freezing protection (nano aerogel heat preservation, intelligent heat tracing belt and drain valve) ensures that the pipeline can still normally run at the extremely low temperature of-50 ℃, and thoroughly solves the problem that the traditional pipeline is easy to frost crack. The self-temperature-limiting heat tracing belt (PTC material) is matched with the PID temperature control system, so that the heating power is accurately adjusted, the local overheating or insufficient heat tracing is avoided, and the anti-freezing reliability is improved by more than 90%. 2. Super heat preservation and great reduction of heat loss Compared with the traditional rubber-plastic/glass wool heat insulation material, the heat dissipation of the nano aerogel heat insulation layer (the heat conductivity coefficient is less than or equal to 0.02W/(m.K)) is reduced by more than 50%, and the energy utilization efficiency is remarkably improved. The aluminum foil reflecting film effectively blocks radiation and heat dissipation, so that the pipeline can still maintain stable medium temperature in a severe cold environment. Drawings FIG. 1 is a schematic structural view of an antifreeze heating and ventilation pipeline structure in severe cold areas; FIG. 2 is a front view of an antifreeze heating and ventilation pipeline structure in severe cold areas; FIG. 3 is a schematic cross-sectional view of a warm air duct. Wherein, 1, an inner metal main pipeline, 2, a nano aerogel heat preservation layer, 3, a self-limiting temperature heat tracing belt, 4, a high-density polyethylene protective layer, 5, a UV protective coating, 6, a drain valve, 7 and an aluminum foil reflecting film. Detailed Description The present utility model will be described in further detail with reference to the accompanying drawings. The present utility model will be described in detail with reference to the accompanying drawings. The utility model provides an antifreeze heating and ventilation pipeline structure in severe cold areas when in implementation, which comprises, An inner metal main pipe 1; the nanometer aerogel heat preservation layer 2 is coated on the outer wall of the main pipeline; A sel