Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit

Lynxcool Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit is developed for refrigeration systems that require stable operation under medium and low-temperature conditions. As a professional refrigeration equipment manufacturer in China, Lynxcool combines compressor manufacturing experience with complete refrigeration engineering capabilities to provide equipment solutions for cold storage, food processing, pharmaceutical storage, logistics centers, and industrial cooling projects.

The unit adopts a semi-hermetic reciprocating structure with integrated components, including filter, service shut-off valve, temperature sensor, and motor protection module. The optimized internal design reduces installation complexity while improving system reliability during long-term operation.

With multiple cylinder configurations from 2 to 8 cylinders and power ranges from 3 HP to 70 HP, this compressor unit can be configured according to different cooling capacities and project requirements. It supports various refrigerants including R290, R404A, R407C, R134a, and R22, making it suitable for different refrigeration system designs.

Working Principle

The Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit works by converting the reciprocating movement of pistons into refrigeration compression power. During operation, refrigerant gas enters the compressor cylinder, where the piston compresses the refrigerant and increases its pressure and temperature before discharge into the refrigeration system.

The semi-hermetic design integrates the compressor and motor into one sealed housing. Refrigerant suction gas passes through the motor chamber to provide cooling for motor windings, helping maintain stable motor temperature during continuous operation.

The two-stage compression structure allows the compressor to handle higher pressure ratios more efficiently compared with conventional single-stage designs. This makes it suitable for low-temperature applications such as blast freezing, cold storage, and pharmaceutical refrigeration systems where stable evaporation temperatures are required.

Technical Features

Stable Operation Under High Pressure Conditions

The compressor unit supports maximum working pressure up to 28 bar, allowing it to operate safely in demanding refrigeration environments. The robust structure is suitable for systems requiring continuous cooling performance, including industrial refrigeration plants and temperature-controlled storage facilities.

Integrated Design for Easier Installation

Lynxcool integrates key components such as filtration devices, service valves, and temperature sensors into the compressor assembly. This design reduces external piping requirements, saves installation space, and helps refrigeration contractors simplify system assembly.

Reduced Vibration Through Precision Mechanical Design

The RefComp crankshaft with counterweight balancing reduces mechanical vibration during compressor operation. This improves operating stability and helps reduce stress on connected refrigeration system components.

Flexible Capacity Selection for Different Projects

The SP series provides different cylinder configurations, including 2, 4, 6, and 8 cylinders. Engineers can select suitable models according to cooling load requirements, operating conditions, and system design.

Built-in Motor Protection System

The integrated protection module monitors important operating conditions including over-current, over-temperature, and phase faults. This helps reduce equipment damage caused by abnormal operation and improves maintenance efficiency.

Suction Gas Motor Cooling Structure

The compressor uses suction refrigerant gas to cool the motor winding during operation. This design improves motor thermal management and supports stable performance during long operating cycles.

Available Configurations

Key Technical Specifications

Semi-Hermetic Two-stage vs Conventional Refrigeration Compressor Unit

When selecting a refrigeration compressor for cold storage or industrial cooling projects, the compressor structure and compression method directly affect system efficiency, operating stability, and maintenance requirements.

Compared with conventional single-stage refrigeration compressor units, Lynxcool Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit is designed for applications requiring higher pressure ratios, lower evaporation temperatures, and continuous operation.

Applications

The SP Series Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit is suitable for a wide range of commercial and industrial refrigeration and air conditioning applications, including:

● Commercial Refrigeration: Supermarkets, convenience stores, walk-in coolers and freezers, and food retail display cases.

● Industrial Refrigeration: Food processing plants, cold storage warehouses, and blast freezing facilities.

● Air Conditioning Systems: Commercial HVAC, rooftop package units, and precision cooling for data centers and clean rooms.

● Food & Beverage Industry: Breweries, dairy processing, beverage chilling, and perishable goods preservation.

● Pharmaceutical & Healthcare: Temperature-controlled storage for medicines, vaccines, and biological materials.

● Hospitality & Retail: Hotels, restaurants, catering facilities, and shopping centers.

● Transportation Refrigeration: Refrigerated transport and logistics cooling infrastructure.

● Environmental & Green Building Projects: Energy-efficient solutions for LEED-certified and low-carbon buildings.

Engineering Capability and Project Support

As a China refrigeration equipment manufacturer, Lynxcool provides more than individual compressor supply. Our engineering team supports customers with refrigeration system selection, equipment matching, installation guidance, commissioning, and after-sales service.

With experience in cold storage, food processing, pharmaceutical refrigeration, and industrial cooling projects, Lynxcool understands the requirements of different working environments, including temperature range, operating conditions, energy consumption targets, and maintenance requirements.

The Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit can be integrated into complete refrigeration solutions together with Lynxcool condensing units, evaporators, cold room systems, and other refrigeration equipment.

FAQ

Q1: What applications are suitable for Semi-Hermetic Two-stage Reciprocating Refrigeration Compressor Unit?

It is suitable for cold storage, blast freezing, food processing, pharmaceutical storage, logistics refrigeration, commercial refrigeration, and industrial cooling systems requiring stable low-temperature operation.

Q2: What refrigerants can this compressor unit use?

The unit supports multiple refrigerants including R290, R404A, R407C, R134a, and R22. The final refrigerant selection depends on system design requirements and local regulations.

Q3: Why choose a two-stage reciprocating compressor?

Two-stage compression improves performance under high compression ratios and is especially suitable for low-temperature refrigeration applications where stable operation is required.

Q4: How does the compressor protect the motor?

The integrated protection module monitors abnormal conditions such as over-current, overheating, and phase faults to help prevent motor damage.

Q5: What is the advantage of suction gas motor cooling?

Suction gas cooling helps control motor temperature during operation, improving motor reliability for continuous refrigeration applications.

Q6: Can this compressor be used for customized refrigeration projects?

Yes. Lynxcool provides refrigeration engineering support and can recommend suitable compressor configurations according to cooling capacity, temperature requirements, and system design.

Q7: How does the semi-hermetic structure benefit maintenance?

The semi-hermetic design provides a compact structure and allows professional technicians to service internal components when required, reducing replacement costs compared with fully sealed designs.