Product Category: Pulp Pump

Product Name: XWJ Non blocking Pulp Pump

Flow range: Q=25-400m3/h

Head range: H=10~32m

Transport temperature: -20-100 ℃

Inhalation pressure: 0-7.5MPa (please declare if higher than 0.3MPa)

Sealing form: mechanical seal

Sealing materials: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L

Overview of XWJ Non blocking Pulp Pump

The XWJ type non clogging pump is a new and energy-saving pulp pump. Through practical use, it has the characteristics of high efficiency, no or little leakage, good anti clogging, smooth operation, high reliability, and compact structure. Mainly reflected in the following aspects; The XWJ pulp pump adopts a semi open or fully open impeller, adjustable clearance between the wear-resistant plate and the front side of the impeller, and mainly uses mechanical seals with high-precision bearings (D-level precision) and high-quality shaft materials. Therefore, the XWJ pulp pump is your ideal "helper", and your success is also our constant pursuit.

Application of XWJ type unobstructed pulp pump product

The XWJ pulp pump can be widely used in the transportation of pulp with a temperature below 110 ℃ and a concentration below 6% in the light industry and papermaking industry. It can also be used in industrial and urban water supply, drainage and other occasions.

The significance of XWJ type unobstructed pulp pump model

For example: 150XWJ200-20A

150- Inlet diameter of pump (mm)

XWJ - New Non clogging Pulp Pump

200- Pump flow rate (m3/h)

A-impeller cutting grade

XWJ type unobstructed pulp pump model parameters

Precautions for XWJ type unobstructed pulp pump

1. Operation precautions

A. The pump is only allowed to operate within the specified parameter range;

B. The pump is not allowed to operate with the discharge valve closed or closed to a very small opening. Otherwise, it will cause the pump to heat up and reduce its lifespan. If the pump is installed in a parallel system, each pump must operate under specific parameters to ensure the flow rate of the pump;

C. The pump cannot operate with the suction valve closed. Otherwise, it will cause the pump to run dry, resulting in damage to the pump components;

D. The medium conveyed by the pump cannot contain air or gas, otherwise it will make it impossible to accurately measure the flow rate and head of the pump, and it will also cause grinding and damage to the parts.

2. Check before starting the pump

A. Before starting the pump, the rotor should be turned to check if it is flexible;

B. Check whether all bolts and pipeline leads are securely connected and the safety situation around the pump;

C. Check if all instruments, valves, and devices are functioning properly

D. Check whether the position of the oil ring and the oil level of the oil level gauge are normal;

E. Check if the direction of the electric motor is consistent with the direction of the pump.

3. Pump start-up

A. Open the suction valve of the pump and the valve of the water seal pipeline;

B. Close the outlet gate valve and pressure gauge plug of the pump; Use the conveyed liquid or vacuum system to remove air from the suction pipe and pump body; Do not start the pump when there is no liquid inside, otherwise it may damage the parts.

C. Start the motor, wait for the pump to operate normally, open the pressure gauge plug, slowly open the pump outlet gate valve, observe the indications of the pressure gauge and switch, and control the given head of the pump according to the reading of the outlet pressure gauge.

4. Pump operation

A. This type of pump relies on an internal balancing mechanism to balance axial force. The balancing device has balancing liquid flowing out. The balancing liquid is connected to the suction section through a balancing water pipe or a short pipe is set outside the balancing room. The balancing liquid flows out of the pump through the short pipe. To ensure the normal operation of the pump, the balancing water pipe must not be blocked;

B. The rolling bearings of this type of pump do not have cooling devices, and the temperature rise of the bearings reflects the assembly quality of the pump. The temperature rise of the bearings should not exceed 35 degrees Celsius above the ambient temperature, and the maximum temperature should not exceed 75 degrees Celsius;

C. The rotor of this type of pump has a certain axial movement during operation, and the clearance value between the end faces of the motor and water pump couplings should be ensured;

D. During the operation of the pump, the instruments, pump speed, impeller, sealing ring, guide vane sleeve, balance plate, and shaft sleeve should be checked for wear at regular intervals. If the wear is too large, it should be replaced in a timely manner. In addition, monitor the flow rate, head, temperature, and lubrication condition of the pump; When the pump malfunctions, it should be stopped and repaired according to the troubleshooting table.

5. Pump shutdown

Before stopping the machine, the pressure gauge plug should be closed first, and the outlet gate valve should be slowly closed. After the outlet valve is closed, the motor should be stopped. When the pump stops steadily, the suction valve of the pump should be closed.

6. Pump maintenance

In order to maintain the efficient and stable working condition of the pump, it must be regularly maintained. The maintenance items and intervals between each maintenance depend on the working conditions and operating conditions of the pump. Regularly check the performance of the pump (such as flow rate, head, vibration, etc.) and keep records. Use these recorded data to analyze whether the pump is working properly, whether maintenance is needed, or determine which part needs to be repaired. Under normal conditions, if precise testing, recording, and regular summary records are maintained, reliable information on whether the pump needs maintenance can be obtained every few months. In addition to monitoring the pump at designated times, the following maintenance is regular;

A. Check if the pump base, pump, and motor are securely fastened. If they are loose, it may cause vibration in the pump;

B. Check the condition of instruments and leads, inspect pipelines for leaks, looseness, or other forms of damage. If necessary, it should be repaired immediately;

C. The packing gland should not be pressed too tightly, otherwise it will affect the service life of the packing;

D. Replace the bearing lubricating oil every 1000 hours of operation.

Assembly and disassembly of XWJ type unobstructed pulp pump

1. Disassembly of pump

When disassembling, the manufacturing accuracy of the parts should be strictly protected from damage: while disassembling the through rod, each middle section should be cushioned to prevent loosening and sinking of the middle section stopper, which may cause the shaft to bend and bend

【 Attention to Matters 】

a. Drain the liquid inside the pump casing:

b. If the bearing components are lubricated with thin oil, the lubricating oil should be drained;

c. Remove the auxiliary pipelines that hinder disassembly, such as balance pipes, water seal pipes, and lead wires,

【 Disassembly sequence 】

The disassembly steps of the pump should start from removing the bearing components on the discharge side, and the order is roughly as follows (due to differences in the structure of the pump, there may be slight differences during the disassembly process):

a. Remove bearing component B from the bolt and connecting nut between the discharge section, packing box body, and bearing body on the side bearing cover of Ningxia

b. Unscrew the round nut on the shaft, remove the sleeve, bearing inner ring (bearing), perforated bearing pressure cover, and water stop ring in sequence, and then remove the packing body (including packing cover, packing ring, and packing, etc.):

c. After sequentially removing the O-ring, shaft sleeve, balance disk, and key on the shaft, remove the discharge section (including the last stage guide vane, balance ring, balance sleeve, etc.);

d. After removing the last stage impeller and key, remove the middle section (including guide vanes): Remove the other stages of impellers, middle section, and guide vanes in the same order until the first stage impeller is removed:

e. After unscrewing the connecting nut between the suction section and the bearing body, as well as the bolt on the bearing cover, remove the bearing component A (before that, the pump coupling should be removed first);

f. Pull the shaft out of the suction section, unscrew the locking nut on the shaft, and sequentially remove the bearing inner ring, O-ring seal, shaft sleeve, and stopper sleeve.

At this point, the dismantling work is basically completed, but during the above dismantling process, some parts are still connected to each other. Generally, after unscrewing the connecting bolts or nuts, they can be removed.

2. Pump assembly

Cleaning and Inspection

a. Clean all parts with kerosene, dry in the air or wipe dry with a cloth;

b. Check the wear and tear of all parts, and replace any parts that cannot ensure normal operation;

c. Check whether there is dust or rust on the pump shaft, and use a dial gauge to check the shaft's unsuitability (the radial runout value of the shaft should not exceed level 8 accuracy);

d. When the sealing gap exceeds 50% of the maximum recommended value, the sealing element should be replaced.

The assembly sequence of the pump is generally carried out in reverse according to the disassembly sequence;

The quality of the assembly of this type of pump directly affects whether the pump can operate normally, and affects the service life and performance parameters of the pump; Affects the vibration and noise of the unit. The following points should be noted during assembly:

a. The concentricity of the fixed parts after assembly is ensured by the manufacturing accuracy and assembly quality of the parts. The machining accuracy and surface roughness of the parts should be protected, and collisions and scratches are not allowed. Molybdenum disulfide used as sealant should be clean, and screws and bolts used for fastening should be evenly stressed.

b. The alignment between the impeller outlet channel and the guide vane inlet channel is ensured based on the axial dimensions of each component. The quality of the neutral flow channel directly affects the performance of the pump, so the size of the pump cannot be adjusted arbitrarily.

c. After the pump assembly is completed and before packing is installed, manually rotate the pump rotor to check whether the rotor rotates flexibly inside the housing, whether there is any friction noise, and whether the axial displacement meets the specified requirements.

d. After the above inspection meets the requirements, add packing to the shaft seals at both ends of the pump, paying attention to the position of the packing ring in the packing chamber.

Installation of Pump

The installation steps of a pump generally include placing the pump on a base, leveling, adjusting, and connecting the pump's pipelines.

1. Equipment required for pump installation

The following conventional specialized equipment and tools are required for pump installation:

a. A lifting equipment with suitable and safe load capacity;

b. Each anchor screw must be equipped with a shim or wedge iron for finding a flat bottom seat;

c. The grouting material must be non shrink grout. To grout, a wooden box needs to be prepared and equipped with a funnel;

d. Installation and disassembly of fillers require a set of specialized tools, such as hooked fixtures.

2. When transporting pumps, safety precautions should be taken to prevent accidents. The following items should be noted during transportation:

A. When transporting pumps, the lifting hook of the crane should be hung below the base. Alternatively, a forklift can be used to transport pumps, and it is not allowed to lift them from the bolt holes of the pump's prime mover or the bearing body of the pump, let alone from the pump shaft;

B. The lifting load should be evenly balanced, and attention should be paid to the load-bearing capacity of the lifting equipment. When lifting, care should be taken to prevent collision of the pump components, especially to avoid damage to the shaft machining fitting surface at the pump coupling.

C. It is strictly prohibited for foreign objects or dust to fall into the pump and motor during transportation

​

3. Pump unboxing inspection

After the pump is transported to the user unit, open the box and check whether the pump parts are lost or damaged during transportation. If there is any loss or damage during transportation, immediately declare to the transportation department or manufacturer.

4. Temporary inventory

If the pump needs to be stored for a period of time before installation, it still needs to be packaged and placed in a suitable dry, rainproof, and dust-proof place. The discharge and suction ports of the pump should be covered to prevent foreign objects from falling in. The pump shaft, bearings, and other precision machined parts should be moisture-proof and coated with a protective oil layer.

5. The foundation of the pump

a. The foundation of the pump must have sufficient strength, and the quality of the foundation should be equal to 3-5 times the mass of the unit. The foundation of the pump should be 50-70cm longer than the base of the pump, and anchor bolt holes (3-5 times the diameter of the steel pipe for the anchor bolts) should be left;

b. Laying the foundation includes the following contents: positioning the anchor bolt holes of the foundation, grouting and leaving space for external connecting pipelines, and then grouting in other spaces. The surface of the foundation may be rough, but the grouting effect is good on one side;

c. Install equipment after the foundation is completely solidified.

6. Moving and leveling up

a. Place steel pads and wedges or adjustment pads under the base, usually at the anchor bolts. If the base is long, a shim can be placed between the two foot bolts;

b. Inspect the foundation beneath the base, clean any flying dust, oil, and other debris.

c. Lift the lifting hook onto the four corners of the base, suspend the base above the foundation, and slowly place the base at the position of each bolt hole (for the position of the anchor bolt hole)

d. Place a knife edge ruler and a mechanical level on the machining plane of the pump and motor base, and adjust the thickness of the wedge iron or adjusting pad to determine the levelness of the base in all directions. It is recommended that the unevenness be less than 0.25 millimeters every 100 millimeters. At this time, tighten the nut of the anchor bolt to an appropriate degree (not too tight), and tighten the wedge iron or adjusting pad.

e. The base should be leveled and tightly matched with the foundation before grouting.

7. Grouting of the base

A. During grouting, ensure that all air in each space is completely expelled

B. After the grouting material solidifies, tighten the nuts of the anchor bolts, and then apply moisture-proof paint to the grouting material

C. After grouting, perform pump and engine calibration work

8. Adjustment of equipment

Equipment adjustment includes adjusting the angle and adjusting the centerline position. The equipment should be checked and adjusted at least during the following three periods.

First time: The pump and base have been tightened, but the motor is not tightened;

Second time: The pump and motor have been tightened, but the bolts of the suction and discharge pipeline flanges are not tightened;

Third time: After 24 hours of pump operation, check again and finally tighten the pump and motor.

9. Attention should be paid to the following matters during the adjustment work

a. When installing the motor and water pump in combination, the end shaft of the pump coupling should be extended outward to ensure the axial clearance value between the pump and motor couplings.

b. The pump can only withstand its own internal forces and cannot withstand any external forces.

c. Before adjusting, check all pipelines to ensure that they do not exert any force or torque on the pump seat;

d. When adjusting the pump and motor, the gasket should be placed under the motor.

Angle adjustment is to ensure the parallelism of the two planes of the coupling. Use a dial gauge to check the four points on the flange end face of the coupling, with a reading of 0.02~0.03 on the dial gauge; The parallelism can also be checked using a feeler gauge, and the difference between the two coupling planes (a-b) should be ≤ 0.06. Centerline alignment refers to the degree of alignment between the pump and motor shaft centerlines

10. Connection of main pipelines

After grouting the pump and fastening it to the foundation, align and connect the pump flange and pipeline flange without external force; This positive connection cannot rely on the force of flange bolts. Pipeline support (additional) should avoid vibration of the pipeline system. The external force of the pipeline on the pump should be reduced. To prevent damage to the pump, the piping system should be cleaned before connecting the pump piping.

Precautions for installing pipelines:

a. The specifications and length of the pipeline used should be appropriate and have sufficient pressure bearing capacity; Minimize bends and attachments in the pipeline as much as possible;

b. The suction pipeline of the pump should be short and straight. The diameter of the pipeline should be greater than or equal to the diameter of the pump's suction port, and the bending radius of the pump's suction pipeline should be made as large as possible.

11. Connection of accessory devices

Pressure gauge: The pressure gauge used on the suction and discharge pipelines must be of good quality and qualified performance. It is best to install the discharge pressure gauge at a distance of twice the diameter of the pump discharge flange, and it cannot be installed next to bends and gate valves. To prevent interference from unstable flow.

Coupling: Before connecting the motor coupling of the pump, recheck its neutrality; Check if the direction of the electric motor meets the requirements. If the direction of the electric motor does not match the direction of the pump, it must be adjusted to the correct direction.

Shaft seal: If necessary, readjust or reassemble the shaft seal before the pump runs.