German Franke pump Franke model Franke price

Franke pumps generate centrifugal force through impeller rotation, acting on the liquid to impart pressure energy and velocity energy within the impeller. A portion of this velocity energy is then converted into pressure energy within the pump casing or diffuser for liquid transfer. They are generally classified by structural characteristics: By operating pressure: low-pressure pumps with pressure below 1MPa; medium-pressure pumps with pressure between 1 and 6.5MPa; high-pressure pumps with pressure above 6.5MPa. By number of working impellers: single-stage pumps with only one impeller on the pump shaft; multistage pumps with two or more impellers on the pump shaft. By impeller inlet method: single-suction pumps with inlet on one side; double-suction pumps with inlets on both sides. By pump casing joint form: horizontal split-case pumps with the split line passing through the axis; vertical joint pumps with the joint plane perpendicular to the axis. By pump shaft position: horizontal pumps with the shaft in a horizontal position; vertical pumps with the shaft in a vertical position. By method of directing discharge from the impeller to the discharge chamber: volute pumps where discharge enters directly into a spiral-shaped casing; diffuser pumps where discharge passes through a diffuser to the next stage or to the outlet pipe. By installation location: submerged pumps with the casing underwater and the driver above water; submersible pumps with both the drive motor and casing underwater; inline pumps directly connected between pipes; deep well pumps installed in underground deep wells. By medium application: clean water pumps (including boiler feed pumps, circulation pumps, condensate pumps, etc.); slurry/impurity pumps (including sewage pumps, mud pumps, slag slurry pumps, gravel pumps, material slurry pumps); petrochemical process pumps (including chemical pumps, process pumps, barrel pumps, oil pumps, etc.); vacuum pumps (including liquid ring vacuum pumps, vane vacuum pumps, etc.).

Franke pump structure composition

The basic construction of a centrifugal pump consists of six parts: impeller, pump casing, pump shaft, bearings, sealing rings, and packing gland. 1) The impeller is the core component of the centrifugal pump; it operates at high speed with high output. The blades on the impeller play a major role. The impeller must undergo a static balance test before assembly. The inner and outer surfaces of the impeller must be smooth to reduce friction loss from water flow. 2) The pump casing, also known as the pump shell, is the main body of the water pump. It provides support and fixation and connects to the bracket holding the bearings. 3) The pump shaft connects to the motor via a coupling to transmit the motor's torque to the impeller, making it the primary component for transmitting mechanical energy. 4) Sliding bearings use transparent oil as a lubricant, filled to the oil level line. Excessive oil will leak along the pump shaft, while insufficient oil will cause the bearing to overheat and fail, leading to accidents! During pump operation, the maximum bearing temperature is 85 degrees, with normal operation around 60 degrees. 5) Sealing rings are also known as leakage reduction rings. 6) The packing gland mainly consists of packing, a water seal ring, a packing sleeve, a packing gland follower, and a water seal pipe. The primary function of the packing gland is to seal the gap between the pump casing and the pump shaft, preventing water inside the pump from leaking out and air from entering the pump, thereby maintaining the vacuum inside the water pump. When heat is generated by friction between the pump shaft and the packing, the water seal pipe directs water into the water seal ring to cool the packing, ensuring normal pump operation. Therefore, inspection of the packing gland requires special attention during routine pump operation checks. The packing should be replaced after approximately 600 hours of operation.

Franke pump maintenance

Centrifugal pump shutdown is primarily caused by mechanical seal failure. Failure mostly manifests as leakage, with the following causes: 1) Leakage at the sealing faces of the stationary and rotating rings, mainly due to: end face flatness and roughness not meeting requirements, or surface scratches; particulate matter between the end faces preventing uniform operation; improper installation or incorrect method. 2) Leakage of the compensating ring O-ring, mainly due to: gland deformation, uneven preload; incorrect installation; O-ring quality not meeting standards; incorrect O-ring selection. Practical usage indicates that the most common failure point for sealing elements is the end faces of the rotating and stationary rings. Cracking of the mechanical seal's rotating and stationary ring end faces in centrifugal pumps is a common failure phenomenon, mainly caused by: 3) Excessive sealing face gap during installation, preventing the flushing fluid from removing heat generated by the friction pair in time; flushing fluid leaking through the sealing face gap, causing end face overheating and damage. 4) Vaporization and expansion of the liquid medium, forcing the two end faces apart due to vaporization expansion forces. When the two sealing faces are forced together, the lubricating film is destroyed, causing end face surface overheating. 5) Poor lubricity of the liquid medium, combined with excessive operating pressure, causes asynchronous tracking rotation of the two sealing faces. For example, in a high-speed pump with a speed of 20445r/min, a sealing face center diameter of 7cm, the linear speed reaches as high as 75 m/s after the pump starts. If one sealing face lags and fails to track the rotation, instantaneous high temperature causes sealing face damage. 6) Blockage of the mechanical seal flushing fluid orifice plate or filter screen, resulting in insufficient water flow and mechanical seal failure.

Franke pump industry applications

Centrifugal pumps feature a compact structure, wide flow and head ranges, and are suitable for mildly corrosive liquids. They offer multiple control options, uniform flow, smooth operation, and low vibration, eliminating the need for special vibration-damping foundations. Equipment installation, maintenance, and repair costs are low. They are widely used in industries such as power generation, metallurgy, coal, and building materials to transport slurries containing solid particles, such as hydraulic ash removal in thermal power plants, slurry transport in metallurgical concentrators, and coal slurry and heavy-medium transport in coal washing plants. When a centrifugal pump operates, it must be installed on land with the suction pipe submerged in water, requiring priming before startup. Due to structural constraints, submersible slurry pumps and vertical submerged centrifugal pumps require the motor to be positioned above the water surface while the pump is submerged; therefore, they must be securely fixed, otherwise the motor could fall into the water, resulting in motor scrapping. Furthermore, since the long shaft length is generally fixed, installation and use are more cumbersome, and application scenarios are subject to many restrictions.

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