DKN-LFC-1500 is one of the higher single-batch capacity models in the Kunning Cryo liquid nitrogen quick freezer lineup: cabinet structure, inner cavity divided into two zones, capacity 1500 kg/batch, operating temperature -150℃～room temperature, temperature control accuracy ±2℃, no-load cooling rate ≤50℃/min, total power 5 kW. The equipment is equipped with an oxygen concentration detector interlocked with operation, suitable for aquatic products, meat and poultry, prepared dishes and similar large-batch quick freezing requiring deep low temperatures and short freezing times.
Technical Parameters
| Item | Parameter |
|---|---|
| Structure | Cabinet, dual-zone (2 zones) |
| Inner cavity dimensions | 1300 mm (W) × 1700 mm (D) × 1800 mm (H), per zone |
| Overall dimensions | 3800 mm (W) × 2500 mm (D) × 2300 mm (H) |
| Operating temperature | -150℃ ～ room temperature |
| Temperature control accuracy | ±2℃ |
| Cooling rate | ≤ 50℃/min (no-load, adjustable per actual process) |
| Total power | 5 kW |
| Power supply | 380V wide voltage (50Hz grid) |
| Refrigerant | 6-8 bar liquid nitrogen |
| Capacity | 1500 kg/batch (varies with different products and packaging methods) |
| Oxygen concentration detection | Setpoint 19.5% ～ 21.5%, interlocked with equipment |
Throughput varies with product type, piece weight and packaging method; specific configuration is determined according to customer materials and capacity requirements.
Cabinet and Insulation
- Inner and outer cavities are formed from SUS304 food-grade stainless steel plate by shearing, bending and welding, with reinforcing ribs at load-bearing positions to resist deformation under long-term load.
- The joint between inner and outer cavities uses ultra-low-temperature resistant sealing strips that do not harden at low temperatures, fitting snugly and absorbing inner box contraction, reducing stress at cabinet joints.
- The insulation layer is a multi-layer adiabatic foamed structure wrapping the inner cavity, reducing cold leakage and frost formation.
- Elastic silicone strips provide thermal insulation between door cover and cabinet; the temperature sensor protection tube uses SUS304 seamless tube, positioned at the middle of the inner cavity wall to reflect the true temperature inside the cabinet.
Freezing System and Cooling
- Liquid nitrogen is fed into the equipment from an external storage tank (user-supplied) through low-temperature high-pressure transfer piping, with the pipeline externally insulated to reduce liquid nitrogen loss.
- The liquid nitrogen path is opened and closed by pneumatic cryogenic valves according to program, with flow regulated by proportional valves, injected through a multi-hole disperser, and after being broken up and vaporized with fans, directly impacts and cools the food.
- The circulation motor is a moisture-proof, explosion-proof, low-temperature resistant motor mounted externally, transmitting power into the cabinet through an extended stainless steel shaft, with a fully welded sealing flange outside to prevent cold air leakage.
- The circulation fan is a low-temperature and corrosion resistant multi-blade axial fan, resistant to frost formation, providing uniform cold air distribution inside the cabinet.
Control System and Safety Design
- Human-machine interface (touch screen) input, PLC intelligent control, equipped with temperature control module and PID auto-adjustment function; can run cooling and holding in steps, with automatic alarm and power-off after program completion.
- PT100 platinum resistance (Class A) temperature measurement, measuring range 200℃ ～ -200℃; color screen display, supports manual and automatic operation, can store multiple freezing processes, one-touch operation.
- Integrated embedded electrical control cabinet, with operation screen embedded in the upper part of the cabinet, reducing floor space.
- Safety: dual-channel temperature sensors for main control and monitoring with feedback system, over-temperature alarm; oxygen concentration detector interlocked with equipment; equipped with emergency stop switch, grounding wire and circuit breaker, phase sequence protector.
Application Scenarios
| Scenario | Description |
|---|---|
| Aquatic processing | Large-batch quick freezing of fish, shrimp, shellfish, requiring rapid passage through the 0℃～-5℃ ice crystal growth zone |
| Meat and poultry processing | IQF and block freezing of cut meat and poultry, requiring deep low temperature and short freezing time |
| Prepared dishes and ready meals | Multi-category batch switching, freezing programs started per batch |
| Central kitchen | Intermittent quick freezing coordinated with portioning rhythm |
The same series also includes DKN-LFC-300 / DKN-LFC-600 / DKN-LFC-1200 and other models, with different zone quantities, inner cavity dimensions and single-batch capacities; for how to choose between cabinet and tunnel types, see Liquid Nitrogen Quick Freezer Selection; for structure and configuration descriptions of the cabinet series, see Liquid Nitrogen Quick Freezer. For continuous production with stable hourly output, see Liquid Nitrogen Quick Freezing Tunnel.
Installation Conditions
- Site: Reserve operating and maintenance space according to overall dimensions, with cabinet door opening direction aligned with the trolley transfer passage.
- Power: 380V/50Hz wide voltage, wiring and grounding according to total power and on-site distribution capacity.
- Medium: On-site liquid nitrogen storage tank and transfer piping required (user-supplied), supplied at 6-8 bar pressure and flow.
- Ventilation: Set up ventilation per site requirements, matching the operating conditions of oxygen concentration detection.
Warranty and After-Sales
One-year warranty for the complete machine; solution provided within 2 hours after receiving request, on-site arrival within 24 hours, fault resolution within 72 hours; one free on-site service per year, lifetime technical support.
Frequently Asked Questions
How is the 1500 kg/batch capacity of DKN-LFC-1500 calculated?
1500 kg/batch refers to the loading and processing capacity per batch. The equipment has a dual-zone structure; actual loading capacity is calculated according to the number of zones and material placement, and needs to be confirmed in combination with piece weight and tray specifications.
What is the cooling rate of this equipment?
No-load cooling rate ≤ 50℃/min, adjustable according to actual production process. Loaded freezing time depends on material thickness, initial temperature, packaging method and target core temperature, calculated per specific product.
What capacity is needed for power distribution?
Total power 5 kW, power supply specification 380V wide voltage (50Hz grid). On-site distribution capacity, wire diameter and grounding are determined according to equipment installation requirements.
Where does the liquid nitrogen come from, and does the equipment come with a storage tank?
The equipment does not include a liquid nitrogen storage tank; liquid nitrogen is supplied from the user’s on-site storage tank through low-temperature transfer piping, at working pressure 6-8 bar.
What is the oxygen concentration detection for?
Liquid nitrogen vaporization can cause localized oxygen deficiency. The equipment is equipped with an oxygen concentration detector, setpoint 19.5%～21.5%, interlocked with the equipment to protect operator safety.
To verify the model according to materials and capacity, visit Contact Us and provide piece weight, target core temperature and shift output requirements; we will calculate according to parameters.