German TAPFLO pump TAPFLO model TAPFLO price

TAPFLO pump is a typical positive displacement hydraulic machine, driven by a prime mover, converting input mechanical energy into pressure energy of the liquid, and then inputting it into the system in the form of pressure and flow. It is the power source of the hydraulic system. Since it can transport liquids under high pressure, it is widely used in various industries in industrial production and daily life, such as water conservancy, construction, and energy. In addition, it is also widely used in shipbuilding, oil extraction, and loaders.

TAPFLO pump usage method

For plunger pump cylinders with inserted copper sleeves, installation can be performed by replacing the copper sleeves. First, trim the outer diameter of a set of plunger rods to a uniform size, and then polish the outer diameter with sandpaper of 1000# or higher. Three methods for installing copper sleeves in the cylinder block: a) Heating the cylinder block for hot assembly or cryogenic compression of the copper sleeve for interference fit; b) Adhesive assembly using Loctite, which requires grooves on the outer diameter surface of the copper sleeve; c) Tapping the cylinder bore, machining threads on the outer diameter of the copper sleeve, applying Loctite, and screwing it in for assembly. Installation methods for cylinder blocks and copper sleeves combined by sintering are as follows: a) Use a grinding rod to manually or mechanically grind and repair the cylinder bore; b) Use a coordinate boring machine to re-bore the cylinder block hole; c) Use a reamer to repair the cylinder block hole. Methods using "surface engineering technology" are as follows: a) Electroplating technology: Plate a layer of hard chrome on the plunger surface; b) Brush plating technology: Brush plate wear-resistant materials on the plunger surface; c) Thermal spraying, arc spraying, or electric spraying: Spray high-carbon martensitic wear-resistant materials; d) Laser cladding: Clad high-hardness wear-resistant alloy powder on the plunger surface. e) Cylinder blocks without copper sleeves are mostly made of ductile iron, with amorphous films or coatings prepared on the inner wall of the cylinder block. Because of this special material on the inner wall of the cylinder bore, a hard-to-hard friction pair can be formed.

TAPFLO pump mechanical structure

The submersible electric pump unit consists of four main parts: the water pump, the submersible motor (including cable), the water delivery pipe, and the control switch. The submersible pump is a single-suction multi-stage vertical centrifugal pump; the submersible motor is a sealed water-filled wet-type vertical three-phase squirrel-cage asynchronous motor, directly connected to the water pump via a claw-type or single-key cylindrical coupling; it is equipped with three-core cables of different specifications; the starting equipment includes air switches and autotransformer reduced-voltage starters of different capacity ratings; the water delivery pipes are made of steel pipes of different diameters, connected by flanges, and high-head electric pumps use gate valves for control. A labyrinth-type sand preventer and two reverse-assembled skeleton oil seals are installed on the upper part of the submersible motor shaft to prevent flowing sand from entering the motor. The submersible motor uses water-lubricated bearings, with a rubber pressure-regulating membrane and pressure-regulating spring installed at the bottom to form a pressure-regulating chamber, adjusting pressure changes caused by temperature; the motor windings use polyethylene insulation and nylon-sheathed water-resistant electromagnetic wire. The cable connection follows cable joint craftsmanship: strip the joint insulation, scrape off the paint layer, connect them separately, weld firmly, wrap with a layer of raw rubber, then wrap with 2-3 layers of waterproof adhesive tape, and finally cover with 2-3 layers of waterproof cloth or bond a layer of rubber (bicycle inner tube) with water-soluble glue to prevent water seepage. Each guide shell stage of the submersible pump contains a rubber bearing; the impeller is fixed to the pump shaft with a tapered sleeve; the guide shells are connected into one unit by threads or bolts. A check valve is installed at the top of high-head submersible pumps to avoid damage to the unit caused by water hammer during shutdown. The motor is sealed, using precision spigot bolts, with rubber gaskets added at the cable outlet for sealing. There is a water injection port and an air vent at the top of the motor, and a drain hole at the bottom. Upper and lower thrust bearings are installed at the bottom of the motor, with grooves on the thrust bearings for cooling, and a stainless steel thrust disc mating with it to withstand the upper and lower axial forces of the water pump.

TAPFLO pump precautions for use

1) Install a residual current device (RCD): An RCD is also known as a life saver, and its function can be understood from the term "life saver." Since submersible pumps operate underwater, leakage can easily cause energy loss or even electric shock accidents. If an RCD is installed, as long as the leakage value of the submersible pump exceeds the operating current value of the RCD (generally not exceeding 30 milliamperes), the RCD will cut off the power supply to the submersible pump, avoiding energy waste due to leakage and ensuring safety. 2) Do not start if the power supply voltage is abnormal: When low-voltage supply lines are long, low voltage at the end of the line is common. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the speed of the submersible pump motor decreases. When it fails to reach 70% of the rated speed, the starting centrifugal switch will close, causing the starting winding to be energized for a long time, leading to heating and even burning out the winding and capacitor. Conversely, excessive voltage causes motor overheating and burns out the winding. Therefore, during operation, the operator must monitor the power supply voltage value. If it is more than 10% below the rated voltage or more than 10% above the rated voltage, the motor should be stopped to identify the cause and eliminate the fault. 3) Avoid frequent switching: Do not frequently switch the submersible pump on and off, because backflow occurs when the electric pump stops. Immediate restart will cause the motor to start under load, resulting in excessive starting current that can burn out the winding. Since the starting current is very high, frequent starts will also burn out the submersible pump motor winding. 4) Do not allow the submersible electric pump to operate under overload for long periods: To avoid long-term overload operation of the submersible electric pump, do not pump water with high sand content, and monitor whether the current value is within the range specified on the nameplate. If the current is too high, stop the machine for inspection. In addition, the running time of the electric pump without water should not be too long to prevent motor overheating and burnout. 5) Ensure correct motor rotation direction: Clarify the motor's rotation direction. Many types of submersible pumps can discharge water in both forward and reverse rotations, but reverse rotation results in lower water output and higher current. Prolonged reverse rotation will damage the motor winding. 6) Cable installation and insulation resistance requirements for submersible electric pumps: When installing the submersible pump, keep the cable suspended and avoid excessively long power cords. Do not subject the cable to stress when lowering or lifting the submersible pump to prevent power cord breakage. Do not let the submersible pump sink into mud during operation, as this will lead to poor motor heat dissipation and burn out the motor winding. During installation, the motor's insulation resistance should not be less than 0.5 megohms. 7) Regularly inspect and promptly repair any issues found: Frequently check the motor. If cracks are found in the lower cover, or if the rubber sealing ring is damaged or failed, replace or repair it in time to prevent water from entering the submersible pump.

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