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My companyHigh wear-resistant self-balancing multistage centrifugal pump adopts heavy-duty design conceptBased on the comprehensive analysis of the structure characteristics of regular multistage pump, the influence of medium on the pump equipment, the performance and operation characteristics of multistage pump, the hydraulic performance of the pump is studied by using the speed coefficient method and similar design method, and the pressure and wall thickness of the main components are analyzed by three-dimensional software to ensure the rationality of the design. The overall structure design is carried out, and the calculation and improvement of shaft diameter, reasonable selection of bearing and bearing seal structure are carried out. The strength and rigidity of rotor components are greatly improved, and the pump is more suitable for operation under complex working conditions with unstable medium density. The self-balancing multistage mud pump developed by our company has been applied to the field, and the operation shows that, pump equipment running smoothly, trouble-free, greatly improve the service life of the pump.

  • Material and heat treatment process measures for key parts such as interstage sealing unit

1)The interstage seal unit is an important part of multistage centrifugal pump, which is composed of guide vane, middle section, impeller, sealing ring, guide vane sleeve and so on. Specifically, the role of its various parts is as follows:

Guide vane:The guide vane is located between the inlet section and the secondary inlet section and is an important part of guiding the inlet water flow to the impeller blades. The design of its shape and quantity directly affects the flow rate and flow direction of the inlet fluid, and affects the performance and efficiency of the entire interstage sealing unit.

Middle section:The middle section is located between the impeller and the sealing ring, and its main function is to support the impeller and the guide vane sleeve, and to reduce the leakage flow by forming a gap with the sealing ring.

Impeller:The impeller is one of the key components of a centrifugal pump. Its rotation can accelerate the water flow and convert it into pressure energy, thereby generating fluid kinetic energy. In the interstage seal unit, the impeller is located between the middle section and the seal ring, and its shape, size, blade number and angle have an impact on the flow rate, flow rate and pressure of the water flow.

Sealing ring:The sealing ring is located between the impeller and the guide vane sleeve, and its main function is to isolate the water flow between the inlet and the outlet to prevent leakage. The quality and sealing performance of the sealing ring have an important influence on the efficiency and reliability of the multistage centrifugal pump.

Guide vane sleeve:The guide vane sleeve is located between the impeller and the middle section, and its main function is to reduce the leakage flow through the gap between the middle section and the sealing ring.

In summary, the various components of the interstage seal unit work together to improve the efficiency and performance of the centrifugal pump by adjusting the flow rate, direction and pressure of the fluid. When designing and manufacturing the interstage sealing unit, it is necessary to comprehensively consider the parameters and characteristics of each part to ensure their mutual matching and cooperative work, so as to realize the high efficiency and long life of the centrifugal pump.

2) In order to control the fluid isolation between impellers at all levels from the aspects of material wear resistance, manufacturing accuracy, and accessory gap dimensions, prevent leakage and backflow, and achieve the purpose of high efficiency and energy saving, the following measures can be taken:

Material wear resistance: the key components in the interstage sealing unit, such as impeller, sealing ring, guide vane sleeve, etc., are made of high wear resistance materials. This can greatly extend the service life of the sealing element, reduce the frequency of maintenance and replacement, and improve the reliability and operating efficiency of the centrifugal pump.

Manufacturing accuracy: In order to ensure the sealing performance between the impellers at all levels, the manufacturing accuracy of each component needs to be ensured during the manufacturing process. For example, the machining accuracy of the impeller needs to be achieved.Q2 of GB/T3216-2005, the machining accuracy of seal ring and guide vane sleeve needs to reach IT6 of GB/T1804-2000. This ensures the fit accuracy of the components and reduces the possibility of leakage and backflow.

Fitting gap size: In order to ensure the sealing performance between the impellers at all levels, the fitting gap size needs to be accurately controlled. For example, the gap size of the impeller and the sealing ring needs to be controlledWithin 0.5mm, the gap size between the guide vane and the guide vane sleeve needs to be controlled within 0.5mm, which can effectively reduce the gap leakage and backflow between the fluid fittings.

 

Part name

Peer-selected process

Hardness value achieved by peer process

Wear resistance achieved by peer process

The hardness value achieved by the process adopted by our company

The wear resistance of the process adopted by our company

Seal ring,Guide vane sleeve

Increase the sealing gap

<HRC55

 

Low hardness, poor wear resistance

≥HRC65

Higher than peer mechanical performance

Impeller

Increase the sealing gap

<HRC70

 

Low hardness, poor wear resistance

≥HRC75

 

Higher than peer mechanical performance

Throttling device

Increase the sealing gap

<HRC70

Low hardness, poor wear resistance

≥HRC75

 

Higher than peer mechanical performance