The first step: According to the liquid is transferred to determine the nature and type of operating conditions; At present, Centrifugal Pump on the market are transported according to the nature of the liquid can be mainly divided into the following categories: ① Water Pump: for the delivery of water and physical [...]]]> Centrifugal Pump

The first step: According to the liquid is transferred to determine the nature and type of operating conditions; At present, Centrifugal Pump on the market are transported according to the nature of the liquid can be mainly divided into the following categories:
① Water Pump: for the delivery of water and physical and chemical properties similar to water, cleaning liquids.
② Naifushibeng: for transportation acid, alkali and other corrosive liquids.
③ pump: for conveying petroleum products.
The second step: According to the flow rate (usually by the production task may be) and the calculation of the required pipeline pressure to determine the pump model (from a sample or product catalog selected).
① search performance table or characteristic curve, required flow and pressure and the piping needed to adapt.
② If there are changes in the production flow in order to find the maximum flow rate shall prevail, H should be maximum flow rate corresponding to the value of search.
③ If the H and Q does not match with the needs, you should look for models in the neighboring H and Q are slightly larger.
④ If the number of models are met, to be elected under the conditions of an operation efficiency of the best
⑤ for insurance, the selected pump can be slightly larger; if too large, the working point far from the point of maximum efficiency, then the low level of energy utilization.
⑥ if they are the nature of the transport of liquid flow with the standard difference between the larger, then the response to the selected pump characteristic curve and calibration parameters to see if it can meet the requirements.
Step three: if they are transportation of liquid viscosity and density difference between the larger and water, shall account for the pump parameters: flow, pressure head and shaft power.

Keywords: Centrifugal Pump, Water Pump

a. pre-inspection

Lubricants name, type, whether the number of the major performance and filling in line with the requirements of technical documents;

Bearing lubrication system, sealing systems and cooling systems are intact, bearing the asphalt, water is smooth;

Moving the [...]]]> Centrifugal Pump

before you start to note the following aspects:

a. pre-inspection

Lubricants name, type, whether the number of the major performance and filling in line with the requirements of technical documents;

Bearing lubrication system, sealing systems and cooling systems are intact, bearing the asphalt, water is smooth;

Moving the pump rotor disk 1 ~ 2 turn, check whether there is friction or jammed rotor phenomenon;

In the vicinity of the coupling or belt guards, etc., whether there is prejudice rotating debris;

Pumps, bearing blocks, motor foundation anchor bolts is loose;

Pump working system of valves or appurtenances shall be at the pump when the load of running the smallest position, should be closed outlet regulating valve;

Jog pump, to see whether the design of the impeller turning turning consistent, if not, need to make a complete cessation of impeller rotation, the adjusting motor wiring only after the re-start.

b. water-filled

Pump start before the pump casing and suction pipe must be full of water, that is because of the presence of air, vacuum pumping the population can not be formed and maintained.

c. warm pump

High-temperature liquid transfer pump, such as the power plant boiler feed pumps must be warm before you start pumping. This is because when it starts to pump, heat pump to the water too, so that pump body temperature from room temperature quickly rose to 100 ~ 200 ℃, which can cause pump inside and outside and the temperature difference between the various components, if there is no long enough heat transfer time and appropriate temperature control measures, will pump around the expansion of inequality, resulting in deformation of pump parts, wear, vibration and bearing hold shaft accident.

Keywords: Centrifugal Pump

Of a pump, the characteristic curve will not change, while the variable pipeline characteristic curves. When the pump’s operating point provided by the traffic does not meet requirements under the new conditions of flow, which should try to change the location of pump operating points, namely, the need for [...]]]>

Centrifugal Pump flow adjustment

Of a pump, the characteristic curve will not change, while the variable pipeline characteristic curves. When the pump’s operating point provided by the traffic does not meet requirements under the new conditions of flow, which should try to change the location of pump operating points, namely, the need for traffic conditioning.
Traffic conditioning methods are:

(1) Centrifugal Pump export pipeline upload a regulating valve to change the valve opening, that is, to change the pipeline characteristic curve He = A + BQe2 in the B value, the valve to open and working point away from the vertical axis; valve off small, working point close to the vertical axis.
This adjustment method has the advantage of simple and flexible. The disadvantage is that the valve off hours, the pipeline resistance increases, the energy loss increases, so that the most efficient pumps can not work within the region is not economical. By changing the method of valve opening to regulate the flow of traffic conditioning is used in modest, but often need to adjust occasions.

(2) changing the pump speed, that is to change the pump characteristic curve.

(3) The turning impeller diameter has also changed the pump characteristic curve. The above two methods can be used to change the pump I curve. Regulate traffic using these methods can guarantee within a certain range of high efficiency pump in the work area, energy use of more economical, but inconvenient, flow adjustment range is not large, so applications are not widely

Keywords: Centrifugal Pump

1, affecting the efficiency of Centrifugal Pump group of several factors

Centrifugal Pump efficiency is mechanical, hydraulic three kinds of volume and efficiency of the product. The [...]]]> Centrifugal Pump Unit by affecting the efficiency of the factors analysis and propose improvement measures to enhance the Centrifugal Pump operational efficiency and reduces energy consumption.

1, affecting the efficiency of Centrifugal Pump group of several factors

Centrifugal Pump efficiency is mechanical, hydraulic three kinds of volume and efficiency of the product. The efficiency of pumping systems for the pump efficiency and electrical efficiency of the product. Centrifugal Pump Unit caused by the low efficiency of the following main factors.

1. Pump itself, the efficiency is the most fundamental impact. Pump under the same working conditions, efficiency may be a difference of more than 15%.

2.Centrifugal Pump operating conditions below the pump’s rated operating conditions, pump efficiency is low, high energy consumption.

3. Motor efficiency in the use of essentially unchanged. So choose a high-efficiency motor of vital importance.

4. The major impact of mechanical efficiency and the quality of the design and manufacture. Pump is chosen, the latter part of the management was less affected.

5. Hydraulic losses include loss of hydraulic friction and local resistance. Pump run for a certain time, has inevitably led to impeller and guide vanes and other components surface wear, water loss increases, water and reducing efficiency.

6. Pump volume loss also known as leakage losses, including the impeller seal ring, class, the axial force balance mechanism three kinds of leakage losses. Volumetric efficiency is related not only to design and manufacture, but also with the late management. Pump after a certain time of continuous operation, due to friction between the various components, the gap increases, volume and reducing efficiency.

7. Since the filter cylinder block, pipelines and other causes inlet Centrifugal Pump for taking the time and idling.

8. Pump before the start of the employee does not pay attention to Centrifugal Pump before the start of the preparatory work, warm pump, plate pumps, infusion pumps and other basic operating procedures do not completely implement and often result in pump cavitation, giving rise to large pump noise, vibration, pump efficiency low.

Second, Centrifugal Pump to reduce energy consumption, improve the efficiency of measures to be taken pump group

1. To replace 14 units inefficient Centrifugal Pump. Replacement, selected parameters and the actual operating conditions relative to similar Centrifugal Pump, ensure the replacement of the pump is always running in the high state. We have done a Centrifugal Pump efficiency compared before and after the replacement experiments, experiments show that the replacement of inefficient, high-consumption Centrifugal Pump, may improve the pump efficiency about 10%.

2. Inverter energy-saving technologies. The design parameter is greater than the actual operating conditions of the Centrifugal Pump, after the installation of frequency control devices, always running on high-performance area.

3. Centrifugal Pump, on the main popularization and application of energy-efficient permanent magnet motor speed control and dual-power electric motor and other new energy-saving products.

4.Centrifugal Pump choice. The use of new pumps should be selected large manufacturers of pumps, in order to ensure high efficiency Centrifugal Pump.

5.Centrifugal Pump maintenance. (1) Centrifugal Pump should regularly check and adjust the shaft seal, reduce volume loss; (2) When the Centrifugal Pump running total of 10000 h, should be overhauled to restore pump efficiency; (3) Centrifugal Pump on the popularization and application of corrugated tube sealing technology, the complete elimination of Centrifugal Pump leakage and improve volumetric efficiency.

6. Regular cleaning of filter tank, check the pipe connections to ensure smooth flow of Centrifugal Pump into the liquid pipe.

7. Centrifugal Pump in strict accordance with operational procedures, Kai pump to conduct a pre-set pump, open the inlet valve, close the exit valve to exhaust venting, check the pump inlet pressure is satisfactory. To prevent the fluid supply pressure is low and flow caused by lack of pump cavitation phenomenon.

8. Regularly Centrifugal Pump for pump efficiency testing, the low efficiency of the pump pumping systems, it is necessary to find the reasons for time and take corresponding measures to solve them.

When the Centrifugal Pump for pumping liquid containing large, medium and small size of the mud flow of materials, it will be injected into the liquid along the tangent to the cylindrical chamber to form the vortex, and a portion of the liquid along the tangent to the exclusion from the room ; the mud sprayed into the chamber axis, the vortex will be large-size materials and the rest of the mud and liquid separation; the rest of the mud and liquid along the axis to exclude from the room and sprayed into the Centrifugal Pump of its imports; the use of Centrifugal Pump out from the material as the formation of the vortex of the jet fluid, thereby reducing the Centrifugal Pump Impeller Centrifugal Pump wear and improve efficiency.

When the Centrifugal Pump for pumping liquid containing large size to the small size of materials when the mud flow, reduce Centrifugal Pump Impeller Centrifugal Pump wear and improve the efficiency of the method, which is characterized, which includes: a liquid spray into the vortex tangential the formation of vortex chamber, and from the chamber along the tangent to the exclusion part of the liquid; b axial spray the slurry into the room, the large size of the vortex with the rest of the material left over from the mud and liquid separately; c the left down in the mud and liquid along the axis to exclude from the room and sprayed into a Centrifugal Pump of its imports; d from the Centrifugal Pump out the use of the material as the formation of the swirl spray liquid; Thus, the large size of the material transfer The cylindrical vortex to be discharged as a result, medium and small, size, material and liquid is sprayed into the Centrifugal Pump, thus, reducing the wear of the impeller and allows high-speed operation of the pump, thus more efficient.

One impeller, each impeller through a liquid [...]]]> Multi-stage Pump the equivalent of several impeller mounted on a shaft at the same time series work, is to represent the number of impeller axis Pump series. Multi-stage pumps work, the liquid from the suction pipe inhalation, in order to squeeze into the impeller by a post-1

One impeller, each impeller through a liquid than can be on the increase of time. Therefore, the Pump impeller series is based on the total lift increases.

Multi-stage Pump is a sub-type Pump, from a front-end, a rear section and several mid-composition, with the bolts to connect into a whole, multi-stage Centrifugal Pump impeller are single-suction, the suction side of the mouth towards. Pump casting a spiral-shaped shell

Of the flow channel, the water flow from one impeller to another impeller, as well as the kinetic energy into pressure energy’s role is carried out by the diffuser, the diffuser is an engraving of guide vane ring, with the nut fixed installation Pump shell. Water flow

Guo diffuser when not move like water through a turbine guide vane of the same, so that with a multi-stage Pump diversion device commonly referred to as guide vane Centrifugal Pump (also known as Turbo Centrifugal Pump)

Keywords: Centrifugal Pump,Pump

Such pumps for liquid delivery depends on the pressure with high-speed rotating impeller blades and complete. Fall into this category are Centrifugal Pump, Axial pump, Mixed-flow pump and so on. Their axial impeller inflow direction Jie Wei, the different

Out of the impeller flow direction. Centrifugal Pump in the [...]]]> Vane

Water Pump

Such pumps for liquid delivery depends on the pressure with high-speed rotating impeller blades and complete. Fall into this category are Centrifugal Pump, Axial pump, Mixed-flow pump and so on. Their axial impeller inflow direction Jie Wei, the different

Out of the impeller flow direction. Centrifugal Pump in the flow under the influence of centrifugal force along the axis perpendicular to the pump impeller outflow radial plane; Axial pump in the flow under the action of the thrust along the axial flow impeller;

Mixed-flow pump impeller flow direction out of range of centrifugal and axial flow pump, and that means in the centrifugal force and thrust of working together, flow along the diagonal flow impeller.

Work according to shaft position can be divided into two vane pump Horizontal pump, Vertical pumps and Oblique axial pump; compression chamber forms of water can be divided into Scroll pump and Guide vane pump; by inhalation methods can be divided into single-suction and double suction pump ; Press

A number of the pump impeller can be divided into Single-stage pump and Multi-stage pump. Each pump can be found in these various categories of the structure type belongs to the corresponding name.

Water Pump of Lu kinds of series of variety, classification methods vary. Principles of Water Pump according to their role can be divided into the following three categories.

1. Vane Water Pump

2. Volumetric Water Pump

3. Based his type of Water Pump

The use of various types of Water [...]]]> Classification of

Water Pump

Water Pump of Lu kinds of series of variety, classification methods vary. Principles of Water Pump according to their role can be divided into the following three categories.

1. Vane Water Pump

2. Volumetric Water Pump

3. Based his type of Water Pump

The use of various types of Water Pump range is very different. Vane Water Pump use of a wide spectrum, including the use of mixed-flow pump axial flow pump and focus on the low-lift, large flow in the drainage works in

Wide range of applications. Centrifugal Pump and the scope of use is something in between, the working range of the most extensive variety of products, the series and specifications are also the largest water supply projects are mostly used in centrifugal pumps. The use of reciprocating pump Fan

Circuit focused on the high-lift, a small traffic engineering.