Model: NL-MYSB-10
The problem
A commercial compressor needs 10,000 hours to finish a life run. On a single bench that means years of queueing - a whole row of machines waits for a slot, so the test duration gets cut and the life conclusion loses its meaning. The working condition is the second problem: inside cold stores, heat pumps and magnetic-bearing chillers, suction temperature, discharge pressure and economizer state all differ, so data from an idle run on room-temperature air does not survive the field. Add flammable refrigerants such as R32 and R290, and a leak found by manual patrol is already too late.
Capability
The bench solves both issues at once. Ten stations are arranged as 5 + 5 in two groups, each group with its own control system, safety door and partition, so maintenance on one group never stops the other. Station cooling capacity runs 20-200kW (R410A basis) with a 150kVA three-phase regulator per station that also works single-phase, covering fixed-speed and inverter compressors. Eight refrigerants are supported - R22, R410A, R134a, R407C, R404A, R32, R290 and R454B - without swapping benches. Conditions are established by the hot-cold fluid mixing method (air ring): superheated discharge vapour is blended with cold liquid-vapour from the condenser outlet in a controlled ratio and fed to the suction line, closing the loop on target suction temperature and pressure. Two condensers of 120kW and 80kW are combined and staged, so small samples do not waste a large condenser and large samples need no series operation. Every station carries both vapour-injection and liquid-injection economizing with displayed, coarsely and finely adjustable economizer temperature and pressure. Life programmes run continuously for 1-29999h or intermittently for 1-999999 starts with 1s-300h on/off times, stopping automatically at target. Suction and discharge temperature and pressure, four shell temperature points per station, voltage, current and frequency all feed one recorder and one software package with curve retrieval by model and date and txt/excel export. Cooling water uses two secondary loops with tank, two plate exchangers and two pumps of equal capacity that switch over, satisfied by 35C tower water, with water pressure and pre/post heat-exchanger temperature monitored. Locked-rotor and protector matching run on the same bench: after locking the rotor at rated voltage the 4s cold locked-rotor current is recorded, then overlaid with starting current on the protector trip characteristic to fix the model, followed by limit-condition, final-break and locked-rotor verification. Sixteen alarms cover high and low pressure, over and under current, discharge over-temperature, shell over-temperature, water shortage and high temperature, pump overload, low cooling water pressure and smoke in station and inverter cabinets. For R32 and R290 the room is protected by two-level concentration detection (level one audible-visual plus forced exhaust, level two power cut-off), explosion-proof fans moving more than 12 air changes per hour, explosion-proof electrics, lighting and vacuum pump, equipotential bonding below 4 ohm, and a fire wall rated over 2h with differential pressure monitoring.
Key specifications
- Stations: 10 (5 + 5 in two groups), independent control per group
- Station cooling capacity: 20-200kW (R410A basis)
- Refrigerants: R22, R410A, R134a, R407C, R404A, R32, R290, R454B
- Condition control: hot-cold fluid mixing (air ring) with closed-loop suction T and P
- Condensers: combined 120kW plus 80kW, staged
- Discharge pressure: 1.0-6.0MPa-G, plus or minus 0.02MPa
- Suction pressure: 0.05-3.5MPa-G, plus or minus 0.01MPa
- Suction/discharge temperature: -40 to 80C (2C); 20-150C (3C)
- Shell temperature: 20-200C, 3C, four points per station
- Economizer: vapour and liquid injection; 0.5-3.0MPa (0.02MPa), superheat 3-10C
- Voltage/current: 0-300V single or 0-540V three-phase (0.25 percent); 0-200A (0.2A)
- Continuous life: 1-29999h settable with auto stop and resettable counter
- Intermittent life: 1-999999 starts; on/off 1s-300h settable
- Cooling water: two secondary loops (tank, 2 plate exchangers, 2 pumps incl. standby), 35C tower water
Applications
Type testing and routine sampling at air-conditioner and heat pump compressor plants; compressor selection validation for screw, magnetic-bearing and VRF commercial units; trip-characteristic matching at protector manufacturers; commissioned life testing at third-party laboratories and whole-machine laboratories
About the manufacturer
Guangdong Endurance Electronic Equipment Co., Ltd provides non-standard customization, drawing confirmation, factory acceptance, on-site installation and commissioning, operation training and long-term technical service; 12-month warranty and long-term spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.
Applicable standards
Test methods and product requirements follow GB/T 15765 (hermetic motor-compressors for room air conditioners) and GB/T 18429 (hermetic scroll refrigerant compressors); compressor safety assessment follows GB 4706.17; explosion protection of the test room for flammable refrigerants follows customer EHS requirements and explosion-proof electrical practice. Working points, life duration and acceptance criteria are per the customer technical agreement.