Equipment Overview
The LN2 Blast Freezer uses liquid nitrogen as the refrigerant medium. Liquid nitrogen flow is controlled by a solenoid valve, sprayed through a multi-hole disperser, and forcefully broken up and vaporized by fans for direct heat exchange with the food. The extreme temperature of liquid nitrogen is -196℃, allowing the food to pass rapidly through the maximum ice crystal formation zone of 0℃～-5℃, forming fine ice crystals and reducing drip loss.
The equipment has a cabinet structure and is available in two types: manual door opening and side door opening. It mainly consists of the cabinet, the cooling system, and the control system.
Models and Parameters
| Item | QF300 | QF600 | QF1200 |
|---|---|---|---|
| Internal chamber dimensions | 900×1320×1800 mm | — | 2000×1500×1750 mm × four-zone |
| External dimensions | 1740×1730×2220 mm | 2900×1700×2450 mm | 8730×2350×2170 mm |
| Working temperature | -150℃～room temperature | -150℃～room temperature | -150℃～room temperature |
| Temperature control accuracy | ±1℃ | ±1℃ | ±2℃ |
| Temperature uniformity | ±3℃ | ±3℃ | — |
| Cooling rate (no load) | ≥20℃/min | ≥20℃/min | ≤50℃/min |
| Total power | 2.5 kW | 5 kW | 12 kW |
| Power supply | 380V/52Hz | 380V/52Hz | 380V wide voltage |
| Refrigerant | 5-8 bar liquid nitrogen | 5-8 bar liquid nitrogen | 6-8 bar liquid nitrogen |
| Throughput | 300 kg/h | 600 kg/h | 0～1200 kg per zone |
| Oxygen concentration detection | — | — | 19.5%～21.5% |
Throughput varies with product type and packaging method. Parameters come from the equipment technical proposal; the specific configuration is determined by the customer’s material and capacity requirements.
Matching Trolleys and Racks
| Model | Trolley/rack | Loading |
|---|---|---|
| QF300 | Trolley 1050×750×873 mm; rack clear height 1600 × width 605 × depth 807 mm | 40 trays per batch |
| QF1200 | 10 racks (depth 1300 × width 1500 × height 1470 mm, two levels) | Independent loading in four zones |
Standard tray size 400×600×25 mm stainless steel (can be supplied by the buyer or provided with the equipment).
Main Structure
Cabinet
- Inner and outer chambers are formed from SUS304 food-grade stainless steel sheet by shearing, bending and welding, with reinforcing ribs added at load-bearing positions
- The insulation layer is a multi-layer adiabatic foamed low-temperature insulation layer, 150 mm thick
- The joint between the inner and outer chambers uses an ultra-low-temperature sealing ring that does not harden at low temperatures and can absorb the cold-shrinkage stress of the inner cabinet
- Integrated embedded electrical control cabinet, with the operation screen embedded in the upper part of the cabinet
- The exhaust vent is located at the rear of the equipment to prevent condensate from dripping onto the food or trays
- The temperature sensor protection tube is a SUS304 seamless tube, located at the middle position of the inner chamber wall
Cooling System
- Composed of a liquid nitrogen tank, liquid nitrogen delivery pipe, solenoid valve, disperser, circulation motor and fan, and guide plates
- The liquid nitrogen flow control solenoid valve is an imported low-temperature liquid nitrogen solenoid valve
- The liquid nitrogen disperser sprays through multiple holes, working with the fans to forcefully break up and vaporize the liquid nitrogen
- The circulation motor is a sealed, low-temperature-resistant external motor, with an extended stainless steel shaft transmitting power and a fully welded sealing flange on the outside
- The circulation fan is a low-temperature-resistant engineering plastic multi-blade axial fan with a hydrophobic surface that resists frosting; the air field is designed by simulation, and the air speed is adjustable
- The liquid nitrogen delivery pipe is insulated on the outside to reduce liquid nitrogen loss
Control System
- Touch screen input, PLC intelligent control, with PID automatic regulation
- Cooling and holding can run in ten steps, with automatic alarm and power-off after the program ends
- PT100 platinum resistance temperature measurement, Class A accuracy
- Main electrical components are imported brands
Main Configuration
| Component | Quantity | Brand | Origin |
|---|---|---|---|
| Solenoid valve | 1 batch | KEIHIN | Japan |
| Temperature control module | 1 set | Siemens | Germany |
| PLC | 1 set | Siemens | Germany |
| Touch screen | 1 set | Siemens | Germany |
| Platinum resistance sensor | 1 set | Heraeus | Germany |
| Relays, contactors | 1 set | Schneider | France |
| Sealing strips | 1 batch | Dow Corning | USA |
| Cabinet insulation material | 1 set | BASF | Germany |
| Moisture-proof, explosion-proof, low-temperature-resistant motor | 1 batch | Taichuang | China |
| Cabinet material | 1 batch | Stainless steel SUS304 | China |
Applications
| Industry | Typical materials |
|---|---|
| Seafood processing | Crayfish, fish head, fish fillet, abalone, sea cucumber, oysters |
| Meat and poultry processing | Beef and mutton, lamb skewers, chicken, duck and goose cuts |
| Prepared food | Sauce packs, skin-pack semi-finished products |
| Fruits and vegetables | Bamboo shoots, fruit and vegetable raw materials |
| Central kitchen | Prepared dishes, catering portions |
Installation Requirements
- Wiring from the main power line to the electrical control cabinet is to be completed by the buyer
- Exhaust ducting, liquid nitrogen and the liquid nitrogen tank are to be provided by the buyer
- The equipment is delivered to the site by the supplier, with personnel dispatched for installation and commissioning
Service
- 1-year warranty on the complete machine, 2-year warranty on the control system
- Free on-site after-sales follow-up visit arranged every year
- After a fault report is received, we first communicate by phone and provide a solution within 2 hours; if the issue cannot be resolved by phone, we arrive on site within 24 hours and clear the problem within 72 hours
- During the warranty period, faults caused by design or manufacturing are repaired free of charge by the supplier; long-term technical support is provided after the warranty period
Want to confirm which model suits your product? Tell us your material type, single-package weight, capacity requirement and target core temperature, and we will propose a solution based on your product.
Product Photos
