Design

Submersible mixers with flow housing, directly driven (RZP 20..., RZP 25‐2...) or with single‐stage planetary gear (RZP 50‐3..., RZP 60‐3..., RZP 80‐2...)

Application

• Pumping sewage via low delivery heads at high flow rates, e.g. between balancing, nitrification and denitrification basins
• for pumping process, raw, pure and cooling water, e.g. in paint finishing systems or for potable water treatment;
• Generation of fluid current in water channels, e.g. amusement parks

Type key

Special features/product advantages

• Vertical or in-line design
• Self-cleaning propeller, in part with helix hub
• Propeller in steel or PUR version
• ATEX, FM and CSA version

Technical data

Equipment/function

• Stationary installation directly on the flow pipe
• Flexible installation via lowering device
• Vertical or in-line installation possible

Materials

• Housing components: A 48 Class 35/40 B (EN-GJL-250)
• Propeller: PUR or AISI 316TI (1.4571)
• Propeller hub: AISI 316TI (1.4571)
• Screwed connections: AISI 304 (1.4301) or AISI 316TI (1.4571)
• Gear shaft: AISI 329 (1.4462) (RZP 50-3, RZP 60-3, RZP 80-2)
• Flow housing: AISI 316TI (1.4571)

Description/design

Propeller

2-, 3- or 4-blade propeller with a nominal propeller diameter of 8 inch (200 mm) to 31.5 inch (800 mm). Entwining-free design made possible by backward-curved incoming flow edge . Propeller up to a diameter of 10 inch (250 mm) have a patented helix hub.

Motor

Wilo-submersible motor of the T-series with standard connection for an easy and efficient adaptation of the motor output. The motor heat is given off directly to the fluid via the housing. The winding is equipped with a temperature monitor. Large-sized inclined (not with RZP 80‐2) and grooved ball bearings ensure long service life of the motor bearings.

Sealing

RZP 20 … 25-2

Double shaft sealing with large-volume sealing chamber to collect leakage from the mechanical seal. If desired, the sealing chamber can be equipped with an internal or external sealing chamber electrode. On the fluid side, sealing is achieved using a corrosion- and wear-resistant mechanical seal made of solid silicon carbide material; on the motor side, a rotary shaft seal is used. A seal bushing ensures long-term corrosion-protected fit of the mechanical seal.

RZP 50-3 … 80-2

Double shaft sealing with large-volume gate and sealing chamber to collect leakage from the mechanical seal. If desired, the prechamber can be equipped with an external sealing chamber electrode. On the motor and fluid side, sealing is achieved using a corrosion- and wear-resistant mechanical seal made of solid silicon carbide material. The sealing between the individual chambers is achieved using rotary shaft seals. A seal bushing ensures long-term corrosion-protected fit of the mechanical seal.

Gear RZP 50-3…80-2

Single-stage planetary gear with exchangeable transmissions. The gear bearings are dimensioned so that the resulting mixing forces are absorbed and are not transferred to the motor bearings.

Cable

The power cable is a type H07 cable (with T 12 motor) or NSSHÖU (with T 17 and T 20 motor) for heavy mechanical loads. The power cable enters the motor housing through a water pressure-tight cable lead-in with strain relief and bend protection. The individual wires as well as the cable sheath are additionally sealed to keep out fluids.

Configuration

A separate configuration must be carried out for each application to ensure optimum pumping results. Carefully follow the instructions for the supplied configuration when installing the units.

Commissioning

Operating mode S1 ‐ permanent operation:

The submersible mixer must be immersed when operated. Surfacing the propeller is strictly prohibited. In the case of fluctuating fluid levels, the system should switch off automatically if the degree of water submersion drops below the minimum level. The power cables must be installed in a way that these cannot be drawn into the propeller!

Options

• Special voltages
• Thermistor temperature sensor
• External sealing chamber control
• Ceram C0 coating
• Ex-rated to ATEX, FM or CSA

Accessories

Scope of delivery

• Recirculation pump with mounted propeller hub, flow housing and cable
• Cable length per customer request
• Accessories per customer request
• Operating and maintenance manual