Standard Welded Sanitary Magnetic Stirrer

The CJ Series Standard Welded Sanitary Magnetic Stirrer is a bottom-mounted mixing system engineered specifically for sterile, high-purity fluid processing. Unlike traditional top-driven agitators that rely on dynamic mechanical seals, the CJ series operates using a non-contact magnetic coupling drive.

The core design utilizes a static isolation sleeve welded directly into the vessel tank bottom. This construction completely removes the dynamic drive shaft from the product containment zone. By replacing dynamic moving seals with absolute static sealing, this equipment provides a reliable, 100% enclosed environment. It eliminates the root causes of product leakage, lubricant contamination, and external bacterial ingress, making it a foundational component for high-cleanliness production lines.

Core Advantages and Structural Features

The engineering of the CJ series focuses on absolute batch isolation, cleanability, and long-term mechanical stability. Below are the primary advantages and structural characteristics that define this equipment:

Leak-Free Magnetic Coupling Drive

The primary advantage of the CJ series is the total elimination of shaft seals. Power from the external drive motor is transmitted to the internal impeller purely through synchronous magnetic fields generated by high-strength permanent magnets. Because there is no rotating shaft passing through the vessel wall, there is no packing gland to tighten, no seal support liquid to monitor, and no mechanical pathway for atmospheric contamination or batch leakage. If an unexpected torque overload occurs, the magnets safely decouple without causing mechanical breakage or compromising the tank sealing.

Active Self-Cleaning via Perforated Flow Channels

A common drawback of standard bottom-mounted mixers is the risk of product stagnation. The narrow gaps between the internal drive magnet and the static isolation sleeve often trap fluid, leading to batch cross-contamination. The CJ series solves this issue by machining perforated fluid-bypass channels directly into the impeller body.

During Clean-in-Place (CIP) cycles, these multi-hole channels utilize the rotational centrifugal force to drive a continuous loop of cleaning fluid down through the center of the rotor. This fluid flow actively flushes the area underneath the dynamic bearings and completely submerges the inner magnetic steel. This active rinsing eliminates chemical and product residue, allowing the equipment to pass strict CIP and Steam-in-Place (SIP) microbial validation.

Streamlined Maintenance and High Cost-Performance

Designed as a foundational baseline mixer, the CJ series features a simplified mechanical layout with a minimal number of moving components. The clean, open geometry contains no hidden corners or uncleaned dead zones. For maintenance, technicians can unbolt the external drive motor and outer magnetic housing from underneath the tank without opening the vessel or breaking the sterile barrier. The process piping and tank interior remain completely sealed during routine motor inspections, which significantly lowers long-term operational costs and plant downtime.

Reliable Low-Volume and Low-Level Agitation

Because the CJ series is positioned at the lowest point of the tank bottom dish, the impeller stays in physical contact with the fluid even when the tank holds a very small volume of material. This bottom-mount setup prevents the mixer from running dry or losing agitation efficiency during the initial filling phase or the final drawdown phase. The specific orientation of the blades allows the system to handle fluctuating fluid levels while maintaining stable, homogenous blending and suspension across different medium densities.

High-Grade Traceable Materials

To withstand aggressive CIP chemicals, high-temperature SIP sterilization, and corrosive process fluids, the CJ series uses premium certified materials:

• Product-Wetted Metallurgy: Available in premium SS316L or SS304 stainless steel, polished to strict sanitary specifications to prevent protein binding and bacterial adhesion.

• Dynamic Bearings: Built using technical ceramic friction pairs, with options for Silicon Carbide (SiC) or Tungsten Carbide (Hard Alloy). SiC offers extreme hardness and resistance against aggressive acids, while Tungsten Carbide provides superior mechanical impact resistance, and both ensure zero particle shedding.

The complete physical assembly comprises the inner magnetic steel (integrated with the mixing blades), the welded static isolation sleeve, precision dynamic bearings, the outer magnetic driver, and the heavy-duty electric drive motor.

Sizing and Process Capability

The CJ series provides a highly scalable operational range to match a wide variety of processing requirements:

• Working Volumetric Range: Standard models are engineered to fit vessel sizes from compact 10-liter pilot setups up to large 50,000-liter industrial tanks, covering small-scale R&D up to mass production.

• Speed and Power Ratings: The selection covers multiple motor configurations delivering optimized torque profiles across specific operational speeds, including standard low-shear mixing at 200 rpm up to high-intensity dispersion and dissolution at 960 rpm.

• Environmental Limits: The equipment is designed to operate safely in temperatures up to 130°C and internal vessel pressures ranging from a deep vacuum of -0.09 MPa up to a positive pressure of 0.6 MPa.

Brief Application and Selection Notes

The CJ series is primarily used for dissolving, blending, and ingredient mixing in the biopharmaceutical, food, and cosmetic industries. Typical applications include sterile buffer preparation, vaccine blending, media preparation, and liquid food fortification.

For processing fluids with viscosities exceeding 100 CP, or for operations running outside the standard pressure and temperature limits listed above, custom technical selections are required to ensure correct motor torque and magnetic coupling stability.