1、 Overview

The ZM slurry pump is designed using the theory of solid-liquid two-phase flow and incorporating the advantages of advanced slurry pump structures from both domestic and international sources. This material has excellent wear resistance and can work in any harsh working condition, greatly extending the service life of the pump. In addition, the reasonable design of the impeller flow channel makes the energy conversion more complete.

2、 Purpose and Characteristics

The ZM type slurry pump is a cantilever horizontal centrifugal pump. Suitable for conveying high concentration (50%) and large particle (50mm) slurry in industrial sectors such as metallurgy, mining, coal, building materials, and thermal power plants.

1. Reliable operation and long service life.

Under the premise of reasonable selection, ZM type slurry pump has the characteristics of reliable operation and long service life. Using a pH pump, it usually takes only 20-30 days to disassemble and replace parts. The use of ZM slurry pump can increase the service life by 2-3 times. Reliable and stable operation, reducing maintenance hours and costs.

2. Advanced performance indicators, high efficiency, and significant energy-saving effects.

This pump has a wide range of flow and head parameters, excellent anti cavitation performance, especially high efficiency, significant energy-saving effect, and can improve efficiency by about 15-20% compared to PH type pumps and PN type pumps. Taking the 150ZM slurry pump as an example to replace the 6PH pump, each pump can save nearly 400000 kilowatt hours. Just focusing on energy conservation alone can basically recoup the investment in new pumps within one year.

3. Reasonable structure and easy installation, disassembly, and maintenance.

The ZM type slurry pump adopts a side opening design, and the transmission part of the bearing component adopts a split structure, which facilitates the adjustment of the clearance between the impeller and the front and rear guard plates. It can be disassembled as a whole during maintenance. The shaft seal of the pump can use packing seal and secondary impeller seal. Due to its reasonable structure and easy installation and disassembly, according to the practical experience of domestic users, the installation and disassembly time alone can save more than 50% compared to the old series products.

4. Excellent material quality and complete specifications.

The overcurrent components of ZM slurry pump are made of high chromium molybdenum wear-resistant alloy, which fully meets the requirements for use in various media working conditions. And our factory's product specifications are complete, which can adapt to the needs of users with different parameters.

5. The degree of standardization of components is high.

The same pump head of ZM slurry pump can be equipped with different brackets according to the required motor power. The universality of the bracket and bearing components is strong. The entire series of slurry pumps with 58 specifications only requires 6 brackets and 6 bearing components to match.

3、 Material characteristics and progressiveness

The overcurrent components of ZM slurry pump are made of high chromium molybdenum wear-resistant alloy, a new type of wear-resistant material. This material has excellent resistance to abrasive wear, especially for the erosion wear of slag slurry, and its wear resistance performance is particularly outstanding. This material has good hardenability, even thick parts can be fully quenched, and the hardness can reach HRC65. After years of production, our factory has accumulated rich practical experience and fully mastered all production processes, achieving good performance indicators of this material.

High chromium molybdenum wear-resistant alloy is currently an advanced wear-resistant material both domestically and internationally, surpassing the British BS4844 and German DIN1695 standards, thus ensuring that the wear resistance of our ZM slurry pump is in a good position both domestically and internationally.

4、 Structural description of ZM slurry pump

ZM type slurry pump is a single-stage single suction cantilever horizontal centrifugal pump. Designed by absorbing the advantages of similar products both domestically and internationally in terms of structure. This pump is easy to install, disassemble, and maintain.

Pump head: The ZM slurry pump has a dual pump casing structure, consisting of front and rear pump covers, front guard plates, rear guard plates, protective sleeves, bearings, etc. The overcurrent section is made of high chromium molybdenum wear-resistant alloy, and the outer shell is made of gray cast iron or ductile iron. The outlet position of the pump can be installed and used by rotating eight different angles at 45 ° intervals as needed, and can be installed at the angle required by the user. The front and rear cover blades of the impeller are used to reduce leakage and improve the service life and efficiency of the pump.

Shaft seal: There are two forms of shaft seals, auxiliary impeller shaft seal and packing shaft seal. The secondary impeller shaft seal has the advantages of not diluting the slurry, long sealing service life, and good sealing effect. The packing seal structure is simple and easy to maintain, and can be used with a packing shaft seal for suction use.

Transmission part: ZM type slurry pump can be directly driven. The bearing seat and bearing body components have high structural strength. The pump shaft has a large diameter and good rigidity. The cantilever is short and will not bend or vibrate under harsh working conditions. The bearings selected are thrust ball bearings and short cylindrical rolling bearings, which can withstand the axial and radial loads of the pump. The bearing adopts grease lubrication. The bearing body has bearing covers at both ends, with seals inside and a water slinger ring on the outer end to effectively prevent slurry from entering and grease and oil from leaking out, ensuring the stable operation of the bearing.

Structural diagram of ZM slurry pump (packing form)

1. Suction short pipe 2, front guard plate 3, impeller 4, front pump cover 5, outlet short pipe

6. Rear pump cover 7, protective sheath 8, rear guard plate 9, packing box 10, shaft

11. Auxiliary impeller 12, bearing 13, bearing seat cover 14, bearing seat 15, coupling

Structural diagram of ZM slurry pump (mechanical seal form)

1. Suction short pipe 2, front guard plate 3, impeller 4, front pump cover 5, outlet short pipe

6. Rear pump cover 7, protective sheath 8, rear guard plate 9, packing box 10, mechanical seal

11. Shaft 12, bearing 13, bearing seat cover 14, bearing seat 15, coupling

5、 Assembly, start stop and operation precautions

1. The outlet direction of the ZM pump can rotate at 8 different 45 ° angles in the circumferential direction for easy installation and use by users. The split type bearing assembly and the cylindrical type bearing are lubricated with 20 # engine oil and lithium based grease respectively, which improves the service life of the bearings. All vulnerable parts of the pump are equipped with sealing rings, which have a good sealing effect. The pump is directly driven by a motor or driven by a pulley, and its rotation is in the direction of the arrow. The impeller is connected to the shaft through a threaded connection.

2. Disassembly and assembly shall be carried out according to the general assembly drawing.

3. The inlet pipe should not have sharp bends and should tilt downwards as much as possible to facilitate exhaust.

4. The pressure of the shaft seal water should be greater than the pump outlet pressure by 0.035MPa. If a secondary impeller seal is used, no leakage can be achieved during operation. When starting the pump, the outlet valve should be closed first, and then the outlet valve should be opened after the operation is stable.

5. It is necessary to grasp the operation situation, timely check the changes in current and voltage, and ensure that the temperature rise of the bearings does not exceed 75 ℃. Prevent accidents.

6. The amount of slurry and particles should not exceed the design range to avoid vibration and precipitation of the slurry.

7. When stopping the pump, rinse the overcurrent part with clean water to prevent blockage.

8. Before testing the pump, the motor direction should be checked. When the direction of the steering is consistent with the direction of the pump arrow, conduct a directional test.

9. The inlet and outlet pipes should be designed with separate brackets and should not be supported by the pump body.

10. The connection between the pump and the pipeline should maintain good airtightness, especially the inlet pipe must ensure no air leakage.

11. If the pump unit is installed above the inlet level, a bottom valve should generally be installed, and vacuum water diversion method can also be used.

12. A gate valve and a check valve should be installed behind the gate valve between the pump and the outlet pipeline.

13. For series operation, before starting, close the outlet gate valve and start the first stage pump. After the pump starts, open the outlet gate valve and then start the second stage pump.

14. For series operation, stop the second stage pump first when shutting down, close the outlet gate valve after the pump stops, and then stop the first stage pump.

15. If any abnormal sound is detected during operation, immediately stop the vehicle and investigate the cause.

6、 Possible faults and troubleshooting methods

7、 Precautions for using mechanical seals

Before starting the pump, it is necessary to add shaft seal water, and the pressure of the shaft seal water must be greater than or equal to the outlet pressure.

2. After stopping the pump, the shaft seal water can only be turned off after 10 minutes

3. The leakage phenomenon of mechanical seals is as follows:

a、 The foundation is unbalanced, causing significant vibration

b、 Mechanical seal clearance adjustment too large or too small

c、 Failure to add shaft seal water during startup or insufficient shaft seal water causing heating or burnout

d、 The hot plate or "O" ring seal is damaged.