Semi-hermetic Two-Stage Screw Refrigeration Compressor Unit

Our Semi-hermetic Two-Stage Screw Refrigeration Compressor Unit features a semi-hermetic design, completely eliminating the external shaft seal and eradicating the most common refrigerant leakage problem in open compressors. The motor is placed within the refrigerant environment and directly cooled by the intake gas, effectively isolating it from moisture and impurities, significantly reducing maintenance costs and extending its service life far beyond open units.

The two-stage compression distributes the total pressure ratio across two stages of a single compressor, reducing discharge temperature and improving volumetric efficiency, enabling stable operation at evaporation temperatures as low as -50°C. A built-in economizer interface further enhances system energy efficiency by injecting medium-pressure flash gas between compression stages.

All units are assembled, tested, and inspected at the factory before shipment. Standard compatible refrigerants include R134a, R404A, R507A, R22 (legacy model), and R449A, ensuring quality.

What are the advantages of this product?

1. Semi-hermetic Structure: Seal-free design, motor cooled by intake gas, IP54 protection rating, effectively dust and moisture resistant.

2. Integrated Dual-Stage Compression: Single compressor achieves dual-stage compression, automatically maintaining optimal intermediate pressure, eliminating the need for complex interstage piping design.

3. Built-in Economizer Circuit: Interstage flash gas injection effectively improves refrigerant mass flow rate, increasing system COP by up to 12%.

4. Compact Skid-Mount Design: All components, including the compressor and oil separator, are pre-installed in a single base, minimizing on-site installation work.

5. Fully PLC Automated Control: Uses Siemens/Delta PLC + touchscreen HMI, supporting automatic start/stop, capacity adjustment, defrosting management, and remote monitoring via Modbus or BACnet.

6. Made in China Quality: Manufactured in an ISO 9001 certified factory, conforming to CE standards and GB/T national standards, ensuring reliable and traceable quality.

Technical Parameters

Application Scope

Supermarket & Commercial Refrigeration  |  −20 °C to −35 °C

The Semi-hermetic Two-Stage Screw Refrigeration Compressor Unit is suitable for multi-door display cases, remote condensing units, and central refrigeration systems in supermarkets and food retail stores. Its semi-enclosed design significantly reduces the risk of refrigerant leaks in densely populated areas, minimizing maintenance frequency and meeting the core needs of retail scenarios.

Food Processing & Quick Freeze  |  −30 °C to −45 °C

Spiral freezers, blast chillers, plate freezers, and IQF tunnels for meat, poultry, seafood, and bakery products. Units produced at our China manufacturing facility (Produced in China) are designed for 24/7 continuous operation with minimal planned downtime.

Cold Storage & Distribution  |  −20 °C to −35 °C

Frozen warehouses, distribution centers, and refrigerated logistics hubs. The compact skid footprint reduces plant room space requirements, making it suitable for both new facilities and retrofit installations.

Chemical & Industrial Process Cooling  |  −30 °C to −50 °C

Reactor cooling, condensation systems, and process temperature control. The sealed motor eliminates ignition risk from refrigerant contact with open windings — an important safety feature for chemical plant environments.

Pharmaceutical & Biotech  |  −25 °C to −45 °C

API manufacturing, lyophilization support cooling, and controlled-environment storage. Semi-hermetic construction supports GMP-compatible documentation and minimizes contamination risk from lubricant or seal degradation.

Why Choose Lynxcool?

1. 20 Years of Industry Experience: Over 20 years of experience in industrial refrigeration, accumulating rich installation expertise and continuously optimizing units manufactured in China.

2. Customized Engineering Support: Providing heat load calculations, selection reports, drawings, and equipment lists based on customer needs.

3. Factory Pre-assembly and Testing: All units are assembled in our Chinese factory and undergo rigorous acceptance testing to ensure stable operation.

4. Standardized and Easy-to-Maintain Components: Using components from well-known brands, with ample global spare parts availability, eliminating the need for specialized tools for on-site replacements.

5. Global After-Sales Network: Global service partners ensure spare parts delivery within 48 hours and provide remote diagnostic support.

6. Certification Guarantee: Certified by ISO 9001, CE, PED, etc., with optional UL certification for the North American market.