1、 Overview of FY type corrosion-resistant submersible pump

The FY corrosion-resistant vertical submersible pump is a single-stage single suction long shaft submersible centrifugal pump. Its markings, rated performance points, and flange connection dimensions are equivalent to the ISO2858 international standard, and its technical conditions are based on the ISO5199 standard. Compared with the original FY corrosion-resistant submersible pump, it has the advantages of small size, high efficiency, good energy-saving effect, and reliable operation. Suitable for conveying corrosive media containing slightly solid particles and abrasives.

The conveying temperature of the pump is generally between 0 and 105 ℃ When the temperature is between -20~0 ℃ and 105~180 ℃, insulation jackets and cooling jackets can be used, and low-temperature or high-temperature wear-resistant guide bearings can be used. Users should explain this situation.

If there are a small amount of solid particles in the conveying medium, the sliding bearing should be lubricated externally (with water and other allowed media with an external pressure greater than 0.2 MPa), and the user should explain this situation.

The working pressure of the pump is designed to be 1.6MPa.

The performance range of the pump is 1.6-2600m3/h flow rate and 5-132m head.

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2、 Structural Description of FY Corrosion Resistant Submersible Pump

The FY type mainly consists of pump body, pump cover, impeller, shaft, elastic coupling, pipe flange, guide bearing, intermediate connecting pipe, upper and lower outlet pipes, bearing frame, bottom plate and other parts.

The suction port of the pump follows the axis direction: the outlet is parallel to the axis.

The pump rotates clockwise when viewed from the suction port towards the motor end.

The vertical motor of FY type corrosion-resistant submersible pump is fixed to the motor seat with double headed bolts and directly rotates with the pump through an elastic coupling. The middle connecting pipe of the pump body, the outlet pipe of the bearing frame, and the pipe flange are connected by bolts to form a whole and fixed on the large plate. The whole of the pump is installed on the container through the bottom plate. Except for the contact parts, other main components of FY type pump, such as the motor seat and bearing frame, are made of cast iron.

3、 Schematic diagram of FY type corrosion-resistant submersible pump structure

4、 Loading, unloading, installation, start-up, and operation

1. The disassembly sequence of the pump

(1) Close the gate valve in the discharge pipeline, remove the connecting bolts of the upper half flange of the discharge pipeline, and dismantle a section of the pipeline whose length does not hinder the start of the pump.

(2) Loosen the connecting bolts between the motor frame and the bearing box, and lift off the motor.

(3) Loosen the connecting bolts between the bottom plate and the container, and lift the pump out of the container along with the bottom plate. And clean it with clean water. To prevent air oxidation and corrosion, it should be dismantled immediately.

(4) Remove the pump cover, unscrew the impeller nut (left turn), and remove the impeller.

(5) Remove the pump body, take out the guide bearing, lower protective shaft sleeve, and flat key.

(6) Remove the half flange of the outlet pipe connected to the bottom plate.

(7) Remove the middle connecting pipe. (If there is an intermediate guide bearing, remove it together)

(8) Remove the bottom plate, take off the pump coupling and key, remove the bearing cover and packing cover, and take out the rotor body.

(9) Unscrew the round nut and remove the ball bearing and upper bushing.

The assembly sequence of the pump is opposite to the disassembly sequence. When assembling rotor components, the radial runout of the sealing ring and the outer circumference of the shaft sleeve should be checked and not exceed the values listed in the table.

3. Installation:

(1) After the pump is assembled, rotate the coupling to see if it rotates flexibly, check for any metal friction sounds, and prepare tools and lifting machinery.

(2) Check the concentricity between the pump shaft and motor shaft. The difference between the outer circles of the two couplings should not exceed 0.1 millimeters, and the gap between the end faces of the two couplings should not exceed 0.3 millimeters per week.

(3) The guide bearing should be able to be immersed in liquid, otherwise an appropriate amount of liquid should be drawn out from the outlet pipeline to lubricate the guide bearing and prevent dry wear damage.

(4) When there may be debris falling into the container in the chemical process system, to prevent damage to the pump body from debris, a required form of fence net can be installed at the suction point.

(5) The distance from the suction port of the pump to the bottom of the container should be 1.5 to 2 times the suction diameter, and there should be no less than 2.5 parts around it. For small diameters, the larger value should be taken, and for large diameters, the smaller value should be taken.

(6) The outlet pipeline of the pump should be supported by a separate bracket, and its weight should not be added to the pump body.

(7) After installation, it is necessary to check whether the nuts of each component are tightened, and rotate the coupling to see if it rotates flexibly before assembling the pump motor on the container. After installation, check again.

4. Start and stop:

(1) Check the bearing chamber to maintain a certain amount of clean butter. Usually, it is advisable to fill the oil chamber with 1/2 to 1/3. Avoid excessive temperature rise of bearings during operation. At the same time, apply an appropriate amount of butter lubrication to the filling area.

(2) Rotate the coupling and check for uneven weight. Otherwise, the cause must be identified and eliminated before operation.

(3) Check the direction of rotation of the electric motor to match the specified rotation direction of the pump.

(4) Close the gate valve and pressure gauge on the outlet pipeline. If cooling is required at the sealing point of the packing, circulating cooling water should be used.

(5) Start the motor, turn on the pressure gauge, slowly close the outlet gate valve, then stop the motor and turn off the pressure gauge.

(6) To shut down normally, slowly close the outlet gate valve first, then stop the motor and turn off the pressure gauge.

(7) If the pump is parked or not used for a long time, it should be removed from the container, cleaned, reinstalled, refueled and stored.

5. Operation:

(1) The bearing temperature should not exceed 75 ℃, and there should be an appropriate amount of butter inside the bearing box.

(2) Always pay attention to ensuring the purity of the lubricating oil.

(3) If the following faults occur during the operation of the pump, it should be stopped immediately and repaired.

5、 Self flushing and external flushing

As shown in Figures 1 and 2 below:

The lubrication of the intermediate guide bearing generally adopts a self-lubricating method with an internal self flushing pipe (Figure 1)

If the conveyed medium is dirty or contains hard particles, an external lubrication method using an external flushing tube should be used (Figure 2).