English Product Name

Overview

The Zhengzhou Great Wall DLSB-ZC Low-Temperature Vacuum Pump is an integrated laboratory system engineered for simultaneous vacuum generation and active cooling—designed specifically to enhance the performance of rotary evaporators in solvent removal, concentration, and low-boiling-point compound recovery applications. Unlike conventional water aspirators or standalone diaphragm vacuum pumps, the DLSB-ZC employs a closed-loop refrigeration cycle combined with a high-flow circulation pump to deliver stable sub-ambient coolant temperatures while maintaining deep vacuum conditions. Its operational principle relies on vapor-compression refrigeration (using R404A or equivalent environmentally compliant refrigerant) coupled with a three-port vacuum manifold, enabling independent pressure control across multiple evaporation vessels. The system maintains coolant temperature at approximately 4 °C under typical ambient conditions (5–25 °C), ensuring consistent condensation efficiency and minimizing solvent backstreaming—a critical factor in preserving distillate purity and improving overall recovery yield.

Key Features

• Integrated dual-function architecture: Combines vacuum generation (ultimate vacuum ≤2 kPa absolute) and precision temperature-controlled coolant circulation (−10 °C to 25 °C range, ±2 °C stability) in a single compact unit.
• Triple independent vacuum ports with dedicated analog vacuum gauges—enabling real-time monitoring and parallel operation with up to three rotary evaporators or other vacuum-dependent apparatuses.
• Stainless steel evaporator core and insulated 20 L reservoir ensure long-term corrosion resistance and thermal inertia, supporting uninterrupted operation during extended distillation cycles.
• High-efficiency refrigeration system featuring a Panasonic rotary compressor, Danfoss dryer filter, air-cooled condenser (Xin’ao), and proprietary expansion device—optimized for laboratory-grade reliability and energy efficiency.
• Robust circulation pump (Jingyi brand, 280 W, 30 L/min rated flow) delivers uniform coolant distribution to external condensers, sustaining optimal heat exchange even at elevated load conditions.
• Intuitive local controller (Haihong) with thermal protection, overpressure cutoff, and dry-run prevention logic—compliant with IEC 61000-6-2/6-4 EMC standards for laboratory environments.

Sample Compatibility & Compliance

The DLSB-ZC is compatible with standard ground-glass jointed rotary evaporators (e.g., Buchi, IKA, Yamato, and domestic OEM systems) using standard 19/22 or 24/29 taper interfaces. Its stainless steel evaporator and inert refrigerant pathway prevent contamination of sensitive organic, aqueous, or mildly acidic samples. While not certified to UL/CSA or CE for North American/EU regulatory markets, the unit conforms to GB/T 22989–2008 (Chinese national standard for laboratory refrigerated vacuum systems) and incorporates safety features aligned with ISO 13850 (emergency stop) and IEC 61010-1 (electrical safety for lab equipment). For GLP/GMP-aligned workflows, the analog vacuum gauges support manual logbook recording; digital data acquisition requires external USB/RS485 interface integration (not included).

Software & Data Management

The DLSB-ZC operates via embedded hardware control without proprietary software or cloud connectivity. All operational parameters—including setpoint temperature, actual reservoir temperature, and vacuum status—are displayed locally via LED indicators and analog dials. No built-in data logging, audit trail, or FDA 21 CFR Part 11 compliance is provided. Users requiring electronic recordkeeping must integrate third-party DAQ systems (e.g., LabVIEW-compatible thermocouple/vacuum transducers) or use external chart recorders. Firmware updates are not supported; maintenance is limited to scheduled compressor oil checks, refrigerant leak verification, and filter replacement per manufacturer-recommended intervals (every 12 months under continuous operation).

Applications

• Rotary evaporation of heat-sensitive compounds (e.g., natural product extracts, pharmaceutical intermediates, polymer precursors) where precise condenser temperature control prevents thermal degradation.
• Multi-vessel parallel concentration in analytical chemistry labs—supporting high-throughput sample preparation for HPLC, GC-MS, or ICP-MS workflows.
• Vacuum drying of hygroscopic solids or crystalline materials, leveraging stable low-pressure environment and cold trap functionality to minimize residual moisture.
• Short-path distillation and molecular distillation setups requiring coordinated vacuum and chilled condensation.
• Supporting vacuum-assisted filtration and degassing of solvents prior to spectroscopic analysis or chromatographic injection.

FAQ

What is the recommended coolant medium for the DLSB-ZC reservoir?
Deionized water or 30% ethylene glycol/water mixture is recommended. Pure water may freeze below 0 °C; glycol mixtures extend low-temperature operational margin and inhibit microbial growth.
Can the DLSB-ZC be used with non-rotary vacuum applications (e.g., vacuum ovens or glove boxes)?
Yes—provided the connected system’s vacuum demand does not exceed 30 L/min total flow and the ultimate vacuum requirement remains ≥2 kPa. Avoid connecting to systems with large internal volumes unless pre-evacuated.
Is the refrigeration circuit serviceable by end users?
No. Refrigerant handling, compressor servicing, and sealed-system diagnostics require certified HVAC-R technicians trained in ODP/POPs regulations. Zhengzhou Great Wall provides authorized service centers in mainland China only.
Does the unit include vacuum tubing or fittings?
No. Standard 6–10 mm ID silicone or Viton vacuum tubing and PTFE-tipped clamps must be sourced separately per application requirements.
What maintenance intervals are specified for continuous 8-hour/day operation?
Compressor oil inspection every 6 months; dryer filter replacement annually; reservoir cleaning and descaling every 3 months if using tap water; vacuum gauge calibration recommended semiannually using NIST-traceable reference.