Anti-corrosion application device of plastic-aluminum composite heating radiator in air energy anti-freezing solution heating system

Abstract

The invention discloses an anti-corrosion application device of a plastic-aluminum composite heating radiator in an air energy anti-freezing solution heating system, and belongs to the technical field of air source heat pump low-temperature heating. According to the device, an existing plastic-aluminum composite heating radiator is innovatively applied to an air energy heating system, an inner-layer plastic inner container is adopted to enable anti-freezing liquid to be completely isolated from a metal structure of the heating radiator, and corrosion prevention and leakage prevention are achieved; the built-in condensing coil is immersed in the anti-freezing solution to realize indirect heat exchange with a refrigerant; the system is provided with multiple independent control valves, and heating can be controlled in groups. The industrial problem that the metal heating radiator is corroded by the anti-freezing solution is solved structurally, the use scene of the plastic-aluminum composite heating radiator is expanded, and the plastic-aluminum composite heating radiator has the advantages of corrosion prevention, freezing prevention, energy conservation, safety, reliability and the like and is suitable for household type air energy heating systems in northern low-temperature areas.

Description

[0001] Invention Title: A Corrosion Protection Device for Plastic-Aluminum Composite Radiators in Air Source Heat Pump Antifreeze Heating Systems

[0002] Technical Field: This invention belongs to the field of low-temperature heating technology of air source heat pumps, specifically involving a special heating device that applies existing plastic-aluminum composite radiators to air source heat pump antifreeze heating scenarios, achieving full isolation and corrosion prevention of antifreeze and built-in condensation heat exchange.

[0003] Background technology: Air source heat pump heating systems in low-temperature areas usually require the addition of antifreeze at the heating terminals to prevent the equipment from freezing and cracking in low-temperature environments.

[0004] The existing technology has the following drawbacks: 1. Traditional metal radiators are in direct contact with antifreeze, which is corrosive. Long-term use can easily cause corrosion, perforation, leakage, or even bursting of the radiators, resulting in a short service life. 2. Existing air source heat pump heating technologies mainly focus on improving heat exchange efficiency and system control, but have not effectively solved the problem of antifreeze corrosion and leakage of radiators; 3. Existing plastic-aluminum composite radiators are only used in conventional water heating circulation systems and have not yet been applied to dedicated heating scenarios with built-in condenser heat exchange and antifreeze corrosion protection in air source heat pumps.

[0005] In summary, the industry lacks a dedicated technical solution that can combine aluminum-plastic composite radiators with air source heat pump heating systems and achieve complete isolation and corrosion prevention between antifreeze and metal radiators. Summary of the Invention: 1. Technical problems to be solved: (1) Solve the leakage and bursting problems caused by antifreeze corrosion of air source heat pump radiators; (2) Adapt existing plastic-aluminum composite radiators to the built-in condenser heat exchange scenario of air source heat pumps, and give them the purpose of antifreeze and anti-corrosion in air source heating systems; (3) Realize the indirect heat exchange between refrigerant and antifreeze through condenser coils, so that the refrigerant circuit and antifreeze circuit are completely isolated, thereby improving the safety and reliability of the system. 2. Technical Solution: A corrosion-resistant application device for a plastic-aluminum composite radiator in an air-source heat pump antifreeze heating system, comprising an air-source heat pump unit, a plastic-aluminum composite radiator, a condensing coil, antifreeze, and independent control valves; the plastic-aluminum composite radiator is composed of an inner plastic liner and an outer aluminum alloy finned tube heat dissipation layer, the plastic liner being a sealed cavity; the plastic liner is filled with low-temperature heating-specific antifreeze, which is completely isolated from all metal parts of the radiator; the condensing coil is sealed inside the plastic liner and completely immersed in the antifreeze; the refrigerant pipeline of the air-source heat pump unit is divided into multiple lines, each connected to a group of condensing coils via an independent control valve, achieving independent control of each group; the refrigerant flows within the condensing coils, indirectly exchanging heat with the antifreeze through the pipe wall, and the heat is dissipated into the room through the aluminum alloy finned tube heat dissipation layer. 3. Creative Core (1) New Application: The conventional water heating plastic-aluminum composite radiator is innovatively applied to the antifreeze and anti-corrosion heating scenario of air source heat pump; (2) New Structural Combination: Plastic-aluminum plastic inner tank + built-in condensing coil + antifreeze and metal are completely isolated to form a special antifreeze and anti-corrosion heat exchange structure; (3) New Effect: The corrosion problem of antifreeze on radiators is solved from the structural root, significantly extending the service life; (4) Non-obviousness: Those skilled in the art usually only focus on the heat dissipation, pressure bearing and appearance of radiators, and rarely combine the air source heat pump refrigerant condensation and antifreeze anti-corrosion requirements for structural design. Therefore, the combination scheme of the present invention is not obvious to those skilled in the art. 4. Beneficial effects (1) Full isolation and corrosion prevention: The plastic inner liner completely blocks the contact between the antifreeze and the metal parts, avoiding corrosion and leakage from the source; (2) Low temperature antifreeze: It can be used with antifreeze and will not freeze or crack in an environment of -35℃; (3) Expanding new uses: It realizes the special anti-corrosion application of plastic-aluminum composite radiators in air source heating systems; (4) Group controllable and energy saving: Multi-way independent control valves can realize regional heating on demand, reducing operating energy consumption; (5) Dual-circuit safety: The refrigerant and antifreeze are completely isolated, with no risk of media mixing or cross-contamination, making the system safer and more reliable. Attached image description: Figure 1 is a schematic diagram of the overall system structure of the present invention; Figure 2 is a schematic cross-sectional view of the aluminum-plastic composite radiator of the present invention.

[0006] Figure label: 1— Air source heat pump main unit 2— Compressor 3— Outdoor evaporator 4— Throttling components 5— Refrigerant Main Pipe 6— One-to-N connector 7— Independent control valve 8— Aluminum-plastic composite radiator 9— Plastic inner liner 10— Aluminum alloy finned tube heat dissipation layer 11— Condensing coil 12— Antifreeze 13-N Combination Connector Detailed implementation method: 1. Specifications of core components (1) Air source heat pump main unit: adopts low temperature air source heat pump, refrigerant is R410A; (2) Plastic-aluminum composite radiator: the plastic inner liner is made of modified PPR or PE-RT material injection molding and hot melt molding, and the outside is tightly composite with aluminum alloy finned tube, pressure resistance ≥1.0MPa, operating temperature range -50℃~110℃; (3) Condensing coil: adopts φ9.52mm internal thread copper pipe or stainless steel pipe, the effective length of a single group is about 40m, and each group of radiators is equipped with a condensing coil; (4) Antifreeze: adopts propylene glycol type food grade antifreeze, suitable for low temperature environment up to -35℃; (5) Independent control valve: adopts special copper ball valve or solenoid valve for refrigeration system to realize independent control of multiple groups of radiators. 2. Installation and Connection Method (1) Seal the condenser coil into the plastic inner liner of the aluminum-plastic composite radiator, add antifreeze and reserve space for thermal expansion, and seal the plastic inner liner; (2) Compressor outlet → refrigerant main pipe → one-to-n connector → independent control valve → each group of condenser coils; (3) Condenser coil outlet → N-to-one connector → throttling component → outdoor evaporator → compressor, forming a complete refrigerant circulation loop; (4) The plastic inner liner and the aluminum alloy finned tube heat dissipation layer are firmly bonded to ensure heat exchange and heat dissipation efficiency. 3. Working Method The refrigerant on / off of each group of radiators is controlled by the independent control valve; the refrigerant condenses and releases heat in the condenser coil, and indirectly exchanges heat with the antifreeze; the antifreeze circulates naturally in the sealed plastic inner liner, and the heat is dissipated to the room through the outer aluminum alloy finned tube heat dissipation layer, realizing low-temperature heating with group control, corrosion prevention and antifreeze.

Claims

1. A corrosion-resistant application device for a plastic-aluminum composite radiator in an air-source heat pump antifreeze heating system, comprising an air-source heat pump unit, a plastic-aluminum composite radiator, a condenser coil, antifreeze, and an independent control valve, characterized in that: The plastic-aluminum composite radiator is composed of an inner plastic liner and an outer aluminum alloy finned tube heat dissipation layer. The plastic liner is a sealed cavity filled with antifreeze. The condenser coil is sealed inside the plastic inner liner and is completely immersed in antifreeze; The antifreeze is completely isolated from all metal parts of the radiator; The refrigerant exchanges heat indirectly with the antifreeze through the condenser coil, and the antifreeze transfers heat to the aluminum alloy finned tube heat dissipation layer to achieve heat dissipation. The independent control valve enables independent control of each group of radiators.

2. The apparatus according to claim 1, characterized in that: The plastic inner liner is made of modified PPR or PE-RT material by injection molding and hot melt molding, and is tightly composited with the outer aluminum alloy finned tube. It has a pressure resistance of ≥1.0MPa and a temperature range of -50℃ to 110℃.

3. The apparatus according to claim 1, characterized in that: The condenser coil is a φ9.52mm internally threaded copper or stainless steel tube, with an effective length of approximately 40m per unit.

4. The apparatus according to claim 1, characterized in that: The antifreeze is a propylene glycol-based food-grade antifreeze, suitable for low-temperature environments down to -35°C.

5. The apparatus according to claim 1, characterized in that: The system contains N sets of plastic-aluminum composite radiators that can be started, stopped, and controlled independently.

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