10/01/2021

What is a chemical centrifugal pump?

The chemical centrifugal pump refers to the centrifugal pump used in the chemical industry. Compared with other types of pumps, the chemical centrifugal pump has the advantages of simple structure, not easy to wear, stable operation, low noise, uniform water output, convenient adjustment, and high efficiency. Therefore, the chemical industry Centrifugal pumps have been widely used. The working principle of the chemical centrifugal pump is that when the pump is filled with water, the impeller rotates to generate centrifugal force. The water in the impeller channel is thrown to the periphery and flows into the pump casing under the action of centrifugal force, so the pressure in the center of the impeller decreases, which is lower than the inlet pressure. Under the pressure in the water pipe, the water flows from the suction pool into the impeller under the action of this pressure difference. In this way, the water pump can continuously suck water and supply water continuously.

06/30/2021

Preparation before use of various pumps

1. Check whether the screws in each part are complete and whether there is any looseness to ensure the safe operation of the pump. 2. Check whether the power machine is safe and effective. If you use diesel engine or gasoline engine as power, check whether cooling water, lubricating oil, etc. are missing and running normally. If you use electric motor as power, check whether the wiring erection and connection meet the safety requirements, whether the grounding wire is reliable, whether the motor is damp, and whether the circuit is in good condition. , To prevent electric shock accidents. 3. Check whether the power of the unit is matched and whether the installation is firm. 4. Check whether the transmission connection between the power machine and the water pump is standardized and safe, and whether the protective net and protective cover have been installed at the transmission connection to avoid safety accidents.

06/30/2021

How to use fire pump

1. After starting the pump, check the running current of the motor and whether the pump is running normally. If there is any abnormality, stop the pump immediately. 2. Check the pressure gauge at the outlet of the pump. When the pointer of the pressure gauge reaches the rated working pressure and is stable, gradually open the outlet valve to try to make the pump work in the rated state. 3. After the pump is filled with water normally, move the clutch handle of the vacuum suction installation to the "split" position. 4. Check the pressure of the valve group, the pressure of the clean water valve group is maintained at about 0.8Mpa, and the pressure of the foam valve group is maintained at about 1.0Mpa. If the pressure cannot be maintained, the outlet of the pump and the return valve can be properly adjusted to control the pressure. 5. Check the temperature of the pump and motor bearing from time to time. The maximum temperature should not exceed 75 degrees. Check that the working current of the motor should be within the normal range. 6. After stopping the pump, restore all valves to the normal state according to the valve opening and closing state diagram request.

06/30/2021

Precautions for water pump maintenance

First, the water pipeline must ensure a high degree of sealing, and check whether the connection between the water pump and the water pipeline is loose. Second, add bearing lubricating oil to the bearing body to observe that the oil level should be at the center line of the oil mark, and the lubricating oil should be replaced or replenished in time. After 500 hours of operation of the oil-immersed water pump, the sealed oil must be replaced once. The oil in the water pump motor cavity should also be replaced once a year. Fourth, close the gate valve, outlet pressure gauge and inlet vacuum gauge of the outlet pipe of the water pump. Fifth, start the water pump motor, and try to see if the rotation direction of the water pump motor is correct. Start the water pump motor, when the water pump is running normally, open the outlet pressure gauge, if the pressure is suitable, gradually open the gate valve, and check whether the water pump motor is under load. Sixth, try to control the flow and head of the water pump within the specified range to ensure that the water pump runs at the highest efficiency point in order to obtain the greatest energy-saving effect. Seventh, during the operation of the pump, the bearing temperature should not exceed the ambient temperature of 35C, and the maximum temperature should not exceed 80C. Eighth, if there is any abnormal sound from the water pump, stop and check the cause immediately. Before stopping the water pump, the gate valve and pressure gauge must be closed before stopping the water pump motor. Ninth, adjust the packing gland frequently to ensure that the leakage in the packing chamber is normal. Tenth, check the wear of the water pump shaft sleeve regularly, and replace it in time when the wear is large. Eleventh. If the water pump is out of service for a long time, it is necessary to disassemble the water pump completely, wipe off the water, apply grease to the rotating parts and joints, and store them properly. Twelfth, the mechanical seal lubrication should be clean and free of solid particles. It is strictly forbidden for the mechanical seal to work under dry grinding conditions. Thirteenth, the water pump motor should be turned several times before starting, so as to avoid sudden start and cause the sealing ring to break and damage. Fourteenth, the pump cannot be operated for a long time under the cavitation state. Be sure to prevent the water pump from rusting: when the water pump is not in use, it should be wiped clean and placed in a ventilated and dry place. If the surface of the electric water pump is damaged and peeled off, the rust should be removed in time, and anti-rust paint should be applied to protect it. Fifteenth, it is forbidden to run the water pump motor over current for a long time when the water pump is running at a flow rate. When checking the operation of the water pump regularly, the motor of the water pump runs for a long time with overcurrent. Sixteenth, the water pump should be supervised by a special person during operation to avoid accidents. Seventeenth, the bearing should be refueled every 500 hours of operation of the water pump. The water pump motor power is greater than 11KW and equipped with a refueling device, which can be directly injected with a high-pressure oil gun to ensure excellent bearing lubrication. Eighteenth. After the water pump has been running for a long time, if the noise and vibration of the unit increase due to mechanical wear, the unit should be stopped for inspection, and the vulnerable parts and bearings can be replaced if necessary. Nineteenth, do a good job of comprehensive maintenance. Generally every two years of use, the water pump must be comprehensively maintained. For the worn parts and the parts with poor sealing performance, repairs that can be repaired, and those that cannot be repaired must be replaced completely. Do not use reluctantly. So as not to bring serious consequences. Generally, the above nineteen points should be done well when using the water pump, which can greatly increase the service life of the water pump and also bring us more convenience.

06/30/2021

What is the function of the fire pump? How many types are there

Fire pumps are used to pump all kinds of liquids. They are ideal pumps and fire-fighting systems for creating non-leakage, non-polluting civilized workshops and civilized factories. They are often installed on fire trucks, fixed fire-extinguishing systems or other fire-fighting facilities for transportation. A special pump for liquid fire extinguishing agents such as water or foam solution. Fire pumps are widely used in environmental protection, water treatment, fire protection and other departments. Classification of fire pumps: 1. Divided by purpose: It can be divided into unpowered fire pump (relying on the rotation of the impeller to transfer energy to the liquid without a power source); vehicle fire pump (installed on the chassis of the fire truck); marine fire pump (installed on ships, offshore working platforms, and water Working environment); engineering fire pumps (used for fire hydrant systems, water sprinkler fire extinguishing systems, foam fire extinguishing systems and other engineering sites), etc. 2. Divided by composition: Can be divided into fire pumps (consisting of a set of fire pumps, power sources, control cabinets and auxiliary devices); water supply fire pumps; stabilized fire pumps; deep well fire pumps; submersible fire pumps; ordinary fire pumps and Hand-carried motorized fire pump set (a fire pump set that can be carried by hand and assembled with a light engine), etc.

06/30/2021

The difference between chemical centrifugal pump and ordinary centrifugal pump

First of all, the medium is different. Chemical pumps are generally used in the chemical industry to output chemical raw materials. Generally speaking, chemical raw materials are acid-base, corrosive, toxic, and so on. The main medium of the water pump is water, clean water or non-corrosive water. Some sewage works too. The second is that the material of the pump is different. The materials of chemical pumps are generally corrosion-resistant, metals such as stainless steel, 304, 316, 316L and so on. Non-metals such as rubber lining, fluorine lining and so on. The main function is to prevent corrosion. The material of the water pump, because the water is not corrosive, the general material is cast iron or cast steel. The inside can be painted with anti-rust paint, and the outside can be painted. Finally, the biggest difference between chemical pumps and water pumps is the manufacturing process and safety. The manufacturing process of chemical pumps requires precision, because once there is a problem, it is a very serious problem. Security can't be compared. The flow, head and pressure of the pump not only meet the requirements of the pump, but also safety.