Where is the self balancing multistage pump better, to a horizontal type, ask the industry senior pe

In order to meet the needs of users and accelerate the development of high-pressure multistage pump technology, Changsha Zhonglian Pump Industry adopts the advanced technology of similar foreign products combined with the company's many years of design experience, and develops high-efficiency high-pressure multistage centrifugal pump products according to the APL610 standard; It is a leading technology in the industry. It has the advantages of wide efficiency area, wide performance range, good cavitation performance, safe and stable operation, low noise, less wearing parts, and convenient installation and maintenance. It is used to convey clear water that does not contain solid particles, has a temperature of less than 100 or liquids with physical and chemical properties similar to clean water.

It is suitable for mines, factories and urban water supply and drainage projects. The working principle of the self-balancing multistage pump: the pump shaft rotates under the drive of the motor, and works on the liquid to increase its energy, so that the required amount of liquid is passed through the pump by the suction pool....

The horizontal type of self-balancing multistage pump is generally used to adapt to mines, factories and urban water supply and drainage, and is used to transport clean water without solid particles or liquid with physical and chemical properties similar to clean water, and the temperature of the medium to be conveyed is 0 80, and the inlet pressure is allowed.

Generally, when buying a pump, you need to choose, if you don't know much, go to Hunan Lishengde Energy Saving Technology Co., Ltd. to understand, there will be a special person for your problem.

Summary. Extended information: The pump is divided into rotor components and stator components, the rotor components are called rotor components that rotate with the motor, the so-called channeling means that the rotor can rotate at the same time can move back and forth in the stator, generally this channeling to 3mm.

Because the motor also has axial channeling when rotating, if there is no margin on the pump side, it will lead to axial extrusion between the impeller, the guide vane and the middle section, which will damage the life of the pump. When installing the pump, it is necessary to measure the forward and backward channeling of the rotor relative to the pump body, which is an important part of the multistage pump installation.

Hello dear, the balance plate string is half a string. The half-string amount should be slightly larger than the total string amount. About around. Because the gap between the balance disc when the normal number of answers is working.

Extended information: The pump is divided into rotor parts and stator parts, rotor parts are called rotor parts that rotate with the motor, the so-called channeling means that the rotor can rotate at the same time can move back and forth in the stator, generally this channeling to 3mm. Because the sun shed is also axial when the motor rotates, if there is no margin on the pump side, it will lead to axial extrusion between the impeller, the guide vane and the middle section, which will damage the life of the pump.

When Kaizi installs the pump, it is necessary to measure the forward and backward channeling of the rotor relative to the pump body, which is an important part of the multistage pump installation.

1: The self-balancing multistage pump does not have a balance plate device, so there will be no balance plate wear problem in the case of long-term operation;

2: The self-balancing multistage pump has no return loss of balanced water, so the working efficiency is 5%-14% higher than that of ordinary pumps;

3: There is no tandem movement in the axial direction of the self-balancing multistage pump, which can reduce the wear between the impeller and the mouth ring and the wear of the balance disc during operation;

4: If there is no friction between the balance disc and the balance ring, the impeller and the mouth ring, the shaft power will decrease, so compared with the ordinary multistage pump, the self-balancing pump can save about 3% of the power consumption.

The main technical parameters and performance advantages of self-balancing multistage pump.

Device performance parameters.

Product Introduction. Product implementation standards:

MT T114-2005 "Wear-resistant Centrifugal Water Pump for Coal Mine".

Scope of application and use of the product:

MD(P) type wear-resistant self-balancing multistage centrifugal pump for coal mine is the best alternative to D-type multistage centrifugal pump. This series of products has wide high efficiency, good cavitation performance, stable operation, few wearing parts, greatly improved reliability, and greatly reduced user maintenance costs, thereby reducing the life cycle cost of the pump.

This series of pumps is used for mine drainage, pumping clear water with solid particle content not more than particle diameter not more than mm), temperature below 80 or liquids with physical and chemical properties similar to clean water.

Model representative meaning (example):

md500-57×7

MD - wear-resistant self-balancing multistage centrifugal pump for coal mines.

500 - the design point flow rate is 500m h

57 - design point single-stage head 57m

7 – The number of levels is 7.

Performance range by design point

Flow rate: m3 h Head:

Several important performance parameters for self-balancing multistage pumps include: flow, head, speed, NPSH, power and efficiency.

1. Flow: It is the amount of liquid (volume or mass) conveyed by the pump in a unit time.

The volume flow rate is expressed in Q and the units are: m3 s, m3 h, l s, etc.

The mass flow rate is expressed in qm and the units are: t h, kg s, etc.

The relationship between mass flow and volume flow is: qm= q

where — the density of the liquid (kg m3, t m3), clean water at room temperature = 1000kg m3.

2. Head: It is the value-added energy of the unit weight liquid pumped by the pump from the pump inlet (pump inlet flange) to the pump outlet (pump outlet flange). That is, the effective energy obtained by a newton of liquid through a pump.

Its unit is n·m n=m, that is, the height of the liquid column pumped by the pump, which is customarily referred to as meters.

3. Rotation speed: is the number of revolutions per unit time of the pump shaft, which is represented by the symbol N, and the unit is r min.

4. NPSH: also known as net positive tip, is the main parameter that indicates cavitation performance. The NPSH was expressed by δh in China.

5. Power and efficiency.

Power: usually refers to the input power, that is, the power on the shaft of the prime mover transmission pump, so it is also called the shaft power, which is represented by P; The effective power of the pump is also known as the output power, which is expressed in PE. It is the effective energy obtained in the pump by the liquid conveyed from the multistage centrifugal pump per unit time.

Because the head refers to the effective energy obtained from the pump per unit of heavy liquid output by the pump, the product of the head, the mass flow rate and the gravitational acceleration is the effective energy obtained from the liquid output from the pump per unit time - that is, the effective power of the pump

pe=ρgqh(w)=γqh(w)

where - the density of the liquid conveyed by the pump (kg m3);

– the gravity of the liquid conveyed by the pump (n m3);

q - the flow rate of the pump (m3 s);

h——The head of the pump (m);

g – acceleration due to gravity (m s2).

The difference between the shaft power P and the effective power PE is the power lost in the pump, the magnitude of which is measured by the efficiency of the pump.

Efficiency: The ratio of effective power to shaft power, denoted by .

The self-balancing multistage pump has the advantages of wide efficiency area, wide performance range, good cavitation performance, safe and stable operation, low noise, few wearing parts, and convenient installation and maintenance. The reliability is greatly improved, the trouble-free operation time is more than 3 times that of ordinary pumps, and the maintenance cost of users is greatly reduced, thereby reducing the life cycle cost of the pump. The high-pressure self-balancing segmental centrifugal pump innovates the structure of the traditional multistage centrifugal pump, cancels the axial force balance mechanism of the multistage centrifugal pump, and is the best substitute for the D and DG multistage centrifugal pumps with balance plate or balance drum structure.

Performance range: e.g. d(df, dy, md) 640-80*10(p).

d - represents a multistage centrifugal pump.

Self-balancing multistage centrifugal pump (2 photos).

DF – stands for corrosion-resistant multistage centrifugal pump.

dy – stands for multistage centrifugal oil pump.

MD – stands for Mine Wear-Resistant Multistage Pump.

p - symmetrical arrangement of impellers.

640 - means that the design point flow rate is 640m3 h

80 - means that the design point single-stage head is 80m

10 – indicates that the number of levels is 10.

Model parameters: flow rate: m 3 h

Head: 50-1400m

Note: The value of this performance parameter is the value of the state of clean water at room temperature.

Scope of application: D(P) type: used to transport clear water without solid particles, with a temperature lower than 80 or liquids with physical and chemical properties similar to clean water. It is suitable for mines, factories and urban water supply and drainage projects.

Type DF(P): For the transport of corrosive liquids without solid particles and at a temperature of -20 105. The user can use the name of the conveying medium.

Concentration, specific gravity, operating temperature and pump inlet pressure should be reasonably selected for pump material, sealing form, pump structure and motor power.

DG(P) type: used to convey clear water without solid particles, with a temperature of -20 210 or liquids with physical and chemical properties similar to clean water. Suitable for medium, low and high pressure water supply.

MD (P) type: used for transporting neutral mine water with particle content, particles, temperature of -20 80 and other similar sewage.

Main uses: 1) Water supply and transportation in industrial power stations.

2) Boiler water supply system and condensate delivery in industrial equipment.

3) Medium transportation in petroleum, petrochemical, coal chemical, chemical industry.

4) Conveying cold water in shearing equipment.

5) Pressurized water delivery in the descaling equipment.

6) High pressure water production in industrial processes.

7) Chemical process.

8) Oilfield water injection, mine drainage.

9) Brine collection and transportation.

10) Water transportation for compressors, descaling machines, shelling machines and other equipment.

It is recommended that you consult Changsha Sanchang Pump Factory for professional knowledge, they are also more experienced in doing this.

Performance characteristics of self-balancing multistage pump:

1) High efficiency and energy saving: adopt advanced hydraulic model, independent research and development of high-efficiency and energy-saving products; Because the pump rotor does not have the wear and axial pulsation of the balance plate, the alignment between the impeller and the guide vane is always in the best state, and the efficiency will not decrease significantly with the wear of the balance plate and the forward movement of the rotor components like the ordinary multistage pump structure; Moreover, there is no leakage of balance water, which reduces the volume loss, improves the operation efficiency of the pump as a whole, reduces the shaft power, and is 2%-3% higher than the efficiency of ordinary multistage pumps.

2) New structure: with symmetrical arrangement of the impeller rotor components, the axial force generated by the symmetrical impeller at all levels cancels each other, and the automatic balance of the huge axial thrust in the pump chamber can be realized without the use of balance plate structure, breaking through the traditional structure of multistage pump;

3) New technology: unique throttling and pressure reducing device, odd-level balance device, and can also play an auxiliary supporting role;

4) High reliability: The symmetrical arrangement of the impeller makes the axial thrust generated in operation basically self-balanced, so that there is no need for a balance plate device with small gap, high pressure drop, easy to wash, easy to wear and easy to fail, so that the adverse effect of axial force load on the wear of the pump and the interference of the system is minimized. The residual axial force is borne by the thrust bearing, so that the pump shaft is always in tension, the stress state of the shaft is uniform, and the stress peak is greatly reduced compared with the prototype structure, so as to improve the rigidity and critical speed of the pump rotor, and significantly improve the stability and reliability of the pump rotor.

5) Good cavitation performance and long service life: optimized hydraulic and structural design, precision casting, reliable wear-resistant materials, and the first impeller of some models of pumps adopts double suction structure, so that the pump has good anti-cavitation performance, and the whole machine runs smoothly, has low noise and long service life;

6) Strong reliability of machine seal: there is no axial channeling of the rotor parts when the pump starts and stops, and there is no axial pulsation when working, which overcomes the problem of poor reliability of the machine seal that has been plaguing the multistage pump;

7) Wide application: the small gap balance plate is canceled, which is more suitable for the occasion of worse medium nature than the traditional multistage pump structure;

8) Low maintenance cost: the use of precision casting, reduce the number of wearing parts and maintenance and disassembly, prolong the life of the product, avoid a series of problems caused by excessive disassembly and assembly to the greatest extent, and reduce the maintenance cost;

9) Easy maintenance: The whole machine adopts three-dimensional design and CNC machining of rotor parts, which strictly ensures the processing size and processing accuracy of each component; Accurate positioning, general technical personnel can complete it as long as the assembly sequence and requirements of the first drawing; It completely avoids the need for professionals to adjust the size of the positioning axial jump of the old-fashioned multistage pump, which brings great convenience to users.

1. New structure.

The rotor parts with the symmetrical arrangement of the impeller make the axial thrust generated by the positive and negative groups of impellers in operation basically cancel each other, so that there is no need for a balance disc device with small gap, high pressure drop, easy to wash, easy to wear and easy to fail, and break through the traditional structure of multi-stage pump.

2. New technology.

The unique throttling, pressure reducing device, and odd-level balancing device can also play the role of auxiliary support.

3.Energy-efficient.

Using advanced hydraulic model, self-developed high-efficiency and energy-saving products due to the pump rotor Shenkong without the wear and axial pulsation of the balance plate, the alignment of the impeller and the guide vane is always in the best state, and the efficiency of the ordinary multistage pump structure will be significantly reduced with the wear of the balance plate and the forward movement of the rotor components; And there is no leakage of balance water, which reduces the volume loss, improves the overall operation efficiency of the pump, reduces the shaft power, and is 3%-12% higher than the average efficiency of ordinary multistage pumps.

4. High reliability.

The self-equalizing axial force load minimizes pump wear and system disturbances. A very small part of the residual axial force is borne by the thrust bearing, so that the pump shaft is always in tension, the stress state of the shaft is uniform, and the stress peak is greatly reduced compared with the prototype structure, so as to improve the rigidity and critical speed of the pump rotor, and the stability and reliability of the pump rotor operation are significantly improved.

5. High stability.

Through the optimal combination of symmetrical landing impeller and guide vane, as well as reasonable fitting clearance and wide axial throttle design, the pump can still maintain its high stability and extremely high operating efficiency after long-term operation.

6. Good cavitation performance.

Optimized hydraulic model and structural design, special first-stage impeller double-suction structure, coupled with precision casting, reliable wear-resistant materials, so that the pump has good anti-cavitation performance, the whole machine runs smoothly, low noise, and users do not need to configure the pump or increase the height of the inlet tank.

7. Easy maintenance.

The rapid assembly and disassembly design allows the pump to replace seals and bearings without disassembling the pump body and inlet and outlet pipelines, and there are no vulnerable parts such as balance plates in the pump, saving overhaul and inspection time.

8. Low maintenance rate.

The use of precision casting reduces the number of wearing parts and maintenance and disassembly, prolongs the life of the product, avoids a series of problems caused by excessive disassembly and assembly to the greatest extent, and reduces maintenance costs.

9. Good sealing performance.

When the pump starts and stops, there is no axial channeling in the rotor part, and there is no axial pulsation during work, which overcomes the problem of poor reliability of the machine seal that has been plaguing the multistage pump.

10. Wide applicability.

Advanced modular design, local components that have been tested in large quantities and long-term operation, and the parts have a high degree of interchangeability. The small gap balance plate device is eliminated, and it is more suitable for occasions with harsher media properties than traditional multistage pumps.