ZLQ-ZQ Single Chamber Vacuum Gas-Carrier Aluminum Brazing Furnace Energy Saving Fast Cycle

Product Overview

The ZLQ-ZQ series single chamber vacuum gas-carrier aluminum brazing furnace is purpose-built for high-efficiency brazing of automotive and industrial heat exchangers, including intercoolers, oil coolers, radiators, evaporators, condensers, radar grid antennas, waveguides, and various plate-fin or tube-fin assemblies. By utilizing low-vacuum constant-pressure inert gas protection in place of traditional high-vacuum processing, it significantly shortens evacuation time and accelerates part heating. An external circulating cooling fan further reduces the cooling stage, bringing the total working cycle down to approximately 3.5 hours — nearly half that of conventional high-vacuum brazing. The fully automatic process covers loading, evacuation, inert gas cycling, heating, brazing, forced cooling, and unloading, all with continuous pressure and real-time energy monitoring. Each furnace can be customized in working zone dimensions, load capacity, heating power, and control configuration to match specific production demands.

Key Advantages

• Fast cycle time – completes a full cycle in about 3.5 hours, compared to 6–8 hours for traditional high-vacuum brazing
• Energy efficient – consumes approximately 450 kWh per cycle, far lower than high-vacuum processes, with real-time energy monitoring
• Faster cooling – external circulating cooling fan improves cooling rate and shortens time to unload
• ±3°C temperature uniformity across the entire working zone for consistent brazing quality
• Low pressure rising rate ≤0.3 Pa/h maintains stable low-vacuum conditions
• Flexible automation – choose touch screen or industrial computer for manual or fully automatic control
• Customizable dimensions, load capacity, heating power, and control system to suit your parts and throughput requirements

Technical Specifications

Custom working zone sizes, load capacities, and heating powers are available upon request.

Process Introduction

1. Open the furnace to let the workpieces in and close the door.
2. Open the bypass valve,start vacuum.
3. When the furnace vacuum degree is ≤670pa, start the roots pump.
4. When the vacuum degree in the furnace reaches ≤3Pa, start heating, after heating to the furnace temperature > 360 ℃, close the vacuum valve of the main pump, turn off the roots pump and mechanical pump, open the bypass pump - open the bypass valve and slow charging valve, the system automatically fills and evacuates, keeps the pressure in the furnace within a certain range, and carries out inert gas replacement.
5. During the heating, the furnace body is always kept in a certain pressure range for cyclic replacement, and the filling rhythm is adjusted by the furnace pressure control system and the micro-charging system, and the program is completed automatically.
6. Heating, heat preservation and brazing end power off to stop heating.
7. When the furnace and furnace temperature are cooled off to about 580 degrees, shut off the bypass valve, shut off the micro-charging valve, open the inflation valve to inflate to 0.6 bar and start the air-cooled motor cooling, wait for the furnace temperature to drop to about 450 degrees, turn off the air-cooled motor.
8. Open the bleed valve to balance the pressure outside the furnace in the furnace, prepare for the furnace, wait until the furnace pressures restored to the atmospheric pressure, then close the furnace bleeder valve (automatical delay control). Open the door in place, remove the workpieces, and close the furnace in place.
9. The whole process control is completed by fully automatic control.

For over 15 years, SUNHOPE has been a leading manufacturer and developer specializing in automotive radiator and condenser components, exporting globally. Our expertise encompasses the entire radiator production line.

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• Technical Expertise: As equipment users ourselves, we possess deep operational understanding, enabling us to quickly identify and resolve potential production issues.

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• True One-Stop Solution: From factory design, equipment supply, and component sourcing to technical support - SUNHOPE delivers seamless integration for successful radiator production startup and operation.