Axial flow pump

Axial flow pumpI. Overview     The ZLB series axial flow pump is a vertical semi-adjusting vane type axial flow pump. The blade installation angle can be manually adjusted in advance when assembling the pump according to the working conditions, so that the pump can operate normally in the high efficiency zone and

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Axial flow pump

I. Overview

     The ZLB series axial flow pump is a vertical semi-adjusting vane type axial flow pump. The blade installation angle can be manually adjusted in advance when assembling the pump according to the working conditions, so that the pump can operate normally in the high efficiency zone and play a higher pump unit. effectiveness. The series of pump ports 350, 500, 600, 700, 800, 900, 1000, 1200 are even larger, with a flow rate of 700 to 18,000 m3/hour and a head of 1.5 to 10 m. The water pump is composed of two parts: the pump body part and the transmission part. The installation is divided into two parts: the water pump foundation and the transmission (motor). The two parts are installed with high concentricity. They should be installed by professionals and their installation height (two basic parts). The elevation difference is determined by the design department based on changes in local water levels. This type of pump has low lift and large flow. It is suitable for pumping clean water or other liquids with physical and chemical properties similar to water. The maximum temperature for sucking liquid is 50°, which is mainly used for irrigation and drainage of farmland, industrial thermal power station to transport circulating water, Urban water supply and drainage, dock lifting water level or other water conservancy projects, the use of a wide range.

2.the structure description

This type of pump is mainly composed of the pump body part and the transmission part.
 1. The pump body part:
       The pump shaft is made of high-quality carbon steel and is supported by two rubber (or plastic) bearings. During the operation, good conditions for lubricating the bearing are provided. A bearing at the upper end of the pump shaft is mostly out of the water surface, so a short tube is placed on the stuffing box (or the sealing cover) to provide water to lubricate the bearing before starting. Use (after the water is started, the water can be stopped). The bearing neck is a high-quality carbon steel bushing with a hard chrome finish to improve wear resistance and corrosion resistance. Other main parts such as: flare tube, impeller seat, impeller casing, guide vane body, bearing seat, packing seat and coupling are all made of cast iron, and the water outlet elbow is steel weldment. The packing is filled with filler to improve the sealing of the pump.
       The steering of the pump impeller, viewed from the suction port, is counterclockwise (clockwise from top to bottom). The impeller casing of the pump (or connected to the vane body and the inlet horn) and the adjacent surfaces of the impeller are spherical, which ensures that the blade has a small angle between the outer circumference of the impeller and the impeller casing at any installation angle. The gap is to reduce the loss of return water.
       According to the needs of use, the pump can be used according to the "performance table" to increase or decrease the speed of the blade or to adjust the installation angle of the blade, change the flow rate and lift, and expand the scope of use. The blades are made of high quality ductile iron, and the impellers are factory-corrected by static balance. The blade is fastened to the impeller seat by the blade screw (or the blade tight ring), and the blade and the impeller seat are engraved with an angle line. When the pump is shipped from the factory, the installation angle of the blade is generally "zero". The user can adjust the blade installation angle according to the work performance table according to the needs. Before installation, the user must retighten the blade nut once to prevent loosening and accidents.
2. Pump transmission part:
      According to the dynamic situation of each region and the needs of users, the transmission mode should be determined when ordering. There are three methods for the transmission of ZLB axial flow pump.
    (1) Vertical motor direct drive:
      The motor is fastened to the motor base by bolts. One end of the drive shaft is connected to the motor by a nylon column coupling and the other end is connected with a water pump by a rigid coupling. The drive shaft is made of high quality carbon steel, and other parts such as a motor base. The bearing box and the bearing cover base are all made of cast iron. When the pump is running, its total axial force, that is, the sum of the water pressure on the pump impeller and the weight of all the pump rotors, is absorbed by the bearings in the motor base (or housing). The axial displacement of the pump rotor can be adjusted by the nut in the transmission device, which simplifies the entire pump unit and is convenient and reliable for installation and maintenance.
     (2) Vertical motor V-belt drive:
       The vertical motor is fastened to the frame by bolts. The frame is fastened to the guide rail, and the frame can be slid on the guide rail by bolts to adjust the belt tightness. The radial force during operation is absorbed by the pulley and the radial bearings on the motor.
     (3) Vertical semi-crossing flat belt drive:
     The pulley is made of cast iron and is fixed between the bearing housing and the nut and mounted on the transmission shaft. The radial force of the transmission shaft and the weight of the pump transmission parts and the axial force of the operation are all supported by the ball bearing.
3. Pump support:
      The weight of the pump body (excluding the rotor portion) is absorbed by the foundation or beam supporting the pump body. The weight of the rotor part of the pump, the transmission (including the main transmission part and the power machine) and the axial force of the pump are all supported by the floor of the transmission. Foundation bears.
4, the drive shaft:
      The drive shaft of the axial flow pump should not be too long, otherwise it will cause difficulties in installation and maintenance. To this end, the length of the drive shaft is specified and supplied according to the regulations. When ordering by the user, the pump room design should be carried out according to the "L" size specified in the installation drawing.

3, installation and operation

   1. Check if the pump shaft and drive shaft are bent due to transportation, and if necessary, straighten.
   2. The installation elevation of the pump must be in accordance with the provisions in the installation diagram to meet the NPSH and start-up requirements.
   3, the pool should be equipped with a trash rack before entering the water to prevent debris from entering the pump. The flow rate of water through the shed is not more than 0.3 m/s.
   4. Before installing the pump, check the installation angle of the blade, whether it meets the requirements, and whether it is loose.
   5. After installation, check whether the nuts of each coupling and each foot bolt are tightened. When tightening the nut on the drive shaft and the pump shaft, pay attention to the thread rotation direction.
   6. The drive shaft and the pump shaft must be installed on the same vertical line with a tolerance of less than 0.03 mm/m.
   7. It is not advisable to install a gate valve on the water outlet pipe. If so, it must be fully turned on before starting.
   8. It is best to install a counterweight when using the check valve to balance the weight of the door cover and reduce the water discharge resistance, so that the pump can operate more economically.
   9. Lubricate the bearing of the transmission with grease. During the inspection, the oil chamber should be removed and cleaned, and the grease should be re-injected. The amount should be 1/2~2/3 of the oil chamber, avoiding the bearing temperature rise during operation. . Special care must be taken that the rubber bearings must not be exposed to oil.
  10. Before starting the pump, lubricate the rubber or plastic bearing with water or soapy water in the short tube of the upper packing box. Wait until the pump is running normally.
  11. Before the pump starts, it should first move the coupling three or four turns, pay attention to whether there are any light and heavy unevenness. If so, you must check the cause and try to eliminate it before you run it.
  12. Before starting, check the direction of rotation of the motor so that it matches the pump and then connect it to the pump.
  13. When the pump is running, always pay attention to the following points:
     1 Whether the impeller depth is sufficient, that is, whether the inlet water level is too low, so as not to affect the flow or generate noise.
     2 Whether the impeller outer circle and the impeller shell have friction, whether there are any debris around the blade, whether the rubber or plastic bearing is too tight or burned, so as to avoid the shaft power increase.
     3 Whether the fastening bolt is loose, whether the center of the pump shaft and the drive shaft are consistent to prevent the unit from vibrating.

4, the performance table
Axial Flow Pump
Axial Flow Pump
Axial Flow Pump
Axial Flow Pump
Axial Flow Pump
Axial Flow Pump
 











 

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