How to choose hot water pump

How to choose hot water pump
        First, select businesses. Pay attention to the agricultural sector recognized point of sale or store to buy, and ask for a formal invoice to avoid quality problems and helpless. After the business of the sale of additional services, must be signed with the contract or written on the invoice, or business greatly reduced.
        Second, the election factory. To choose a large scale, good reputation, strong technical force, excellent quality of the manufacturers products. Purchase must be tested "three certificates" (agricultural machinery promotion permit, production license and product inspection certificate), in order to avoid the purchase of obsolete products and poor quality products, do not seek cheap, buy "three no" products Manufacturers, no production date, no production license).
        Third, select the power phase. Phase pump, due to the same specifications single-phase pump compared with the three-phase pump, three-phase pump small size, light weight, low power consumption, low power consumption, Vibration, light, but also more economical.
        Fourth, the election parameters. Select the focus of the submersible pump is to determine the pump flow and head and other parameters. Pump flow selection, with the water to the water and water consumption and family economic conditions to adapt. Users need to choose the best head and pump nameplate lift close to the use of the economy, efficiency can be achieved the highest. If the selected pump head is too small, low-lift pump for high-lift work, that is, "small horse cart", even if the Sheung Shui, water is also very small. At the same time, due to motor overload, if the long run, the motor temperature, the winding insulation layer will gradually aging, and even burn the motor; pump head is too high, high-lift pump for low lift work, "big horse car" There will be run-time traffic is too large, waste of energy and equipment resources.
        Fifth, test quality. Submersible pump motor has a water-filled, oil-filled and shielded structure, generally the most widely used water-filled type. This water pump must be used before the two water-hole bolts all unscrewed, a water injection (no sand), the other air emissions, water and other static after about 15 minutes, so the motor cavity after all the air exhausted with water, Until the full water and then tighten the two water injection bolts, so that the motor is sealed. After the motor is filled with water, the windings work in the water, the insulation of the motor can be measured, the insulation resistance must be measured with a megohmmeter that can not be used with a multimeter, the range of the universal meter is limited, the insulation resistance between the winding and the earth Not clear. Insulation qualified, the pump test run test. When the condition is complete, fill the water in the motor, tighten the water injection bolts, the pump can be energized in the pool test run, but not long-term operation, unconditional idle time in the well, the time shall not exceed 5 minutes.