shwelpump: 一月 2017

2017年1月15日星期日

Water filling method for centrifugal pump

Centrifugal pump before the start of the water filling method are mainly two: one is the end of valve assembly is filled with water, at the end of valve check valve, installed in the water inlet pipe of the import, the shortcomings of this approach is at the end of the valve head loss is large enough to affect the efficiency of pump device; the other a is no bottom valve is filled with water, the greatest advantage of this method is energy-saving, with respect to the bottom of the pumping station can be saving 10% ~ 15%. The following describes several centrifugal pump water filling method, for users to choose to run the pump.

Artificial filling method for the inlet diameter is less than 300mm of small pumping station, in the inlet pipe imports are usually provided with a bottom valve, the general use of the artificial recharge of water law, namely from the upper part of the pump shell special filling water exhaust hole by a water filled funnel (or a removed inverted bottle bottom of the ordinary bottles) filled with water. The inlet diameter is less than 300mm for a small pumping station, in the inlet pipe imports are usually provided with a bottom valve can also be from the pump outlet pipe mouth (short outlet pipe of the pump) to pump water filled. Because there is no need to purchase other water filling equipment, in the current rural small pumping station, the water filling method is common.

Not the end of the valve, a non-return valve and a shorter pipeline of small pumping stations can also be used to start the one hand, side from the mouth of the outlet pipe to pump water filled way, thus the pumps and pipes in the air is gradually carried out, the general continuous water filled a few minutes later, the pump can be normal pumping work.

Stainless steel centrifugal pump installation adjustment and correction method

1. Stainless steel centrifugal pump elevation adjustment

Centrifugal pump elevation adjustment is easy to pump and pipeline connection. In general the elevation to pump axis for measuring points, to pump based on calibration of foundation elevation is used as the measuring datum, level connectivity is measured. For the strict requirements of the centrifugal pump, the elevation adjustment with leveling instrument.

2. Stainless steel centrifugal pump to find the level of

Centrifugal pump find first level degree in looking after the elevation, it is through temporary pad iron level adjustment to adjust the level of degree. The level of centrifugal pump adjustment with a precision of 0.02 mm / m level instrument and the pump inlet and outlet flange face or on the pump shaft were measured. The horizontal split pump can level instrument on the level divided into surface or pump shaft and import and export flange surface measurement.

3. Positioning and correction of the centrifugal pump

The positioning of the centrifugal pump and correction is mounting pump based on according to the center line of the vertical and horizontal center line in order to meet the requirements. In the installation process of the centrifugal pump, centrifugal pump for the size of type the and motor share a base, installation are with integral installation method, the pump and motor and frame together as a whole stable hanging to the foundation, and location and correction. For large centrifugal pump usually first frame lifting in place and adjust the center position and level, the pump and motor lifting to the base to adjust the level of degree of coupling shaft end distance.

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What are the types of vertical pipeline centrifugal pump

Vertical pipeline centrifugal pump repair :

Mainly to clean, replace and repair the wear and corrosion of parts, and adjust the body, to ensure that the equipment can be used to the next planned overhaul. General repairs (dimensions) by the inspection personnel responsible for repair workers, post operation coordination. The main contents are as follows.

1.Check the cleaning filter.

2.Check and adjust the coupling of the coaxial degree and the axial gap, the replacement of the vulnerable parts of the coupling.

3.Check bearing and oil path, replace oil (grease).

4.Check the cooling or heating system and remove scale.

5.Eliminate defects and leakage found in operation. Check and tighten all bolts.

6.Inspection, cleaning pump population, export valve, replace the gasket.

Repair of vertical pipeline centrifugal pump:

Besides minor projects, but also the main components of the equipment for local repair and replace those identified by not continue to use until the next repair time is the main parts.

1.Including minor content.

2.Disassembly, inspection and repair of magnetic couplings in the inner and outer magnetic rotor and isolation kits and replacement parts.

3.Inspection of all parts of the wear, corrosion and erosion degree, to be repaired or replaced.

4.Inspection shaft wear, corrosion and straightness, to repair.

5.Determination of the impeller static balance and check the amount of shaking the rotor.

6.Check the bearing sleeve wear, adjusting clearance, and replacement of bearings.

7.Check and adjust the impeller seal ring, the balance plate and other parts of the gap.

8.Check or check pressure gauge.

9.Inspection, cleaning and motor repair.

Vertical pipeline centrifugal pump overhaul :

All or part of the demolition of equipment, replacement and repair has abrasion and corrosion of parts, in order to restore the original performance of the equipment (including re installation, calibration, paint and re pouring equipment etc.). In order to improve the technical level and the comprehensive function of the device, the equipment can also be used to carry out technological transformation.

1.Including the contents of the repair.

2.Replacement of the impeller.

3.Replace the pump shaft.

4.Pump test thickness, identification, necessary repairs.

5.Measure and adjust the level of pump body.

6.Corrosion.

Equipment maintenance must be carried out after the test run.

Method for regulating the flow of pipeline centrifugal pump

The working point of the pipeline centrifugal pump is determined by the characteristic curve of the pump and the characteristic curve of the pipeline system. So, the change of the characteristic curve of any one can achieve the purpose of flow regulation.

At present, the flow regulation of the centrifugal pump is mainly controlled by the regulating valve, the variable speed control of the pump, and the pump and series regulation. Because of the principle of regulation in different ways, the resulting energy loss is not the same, in order to find the minimum energy consumption, energy saving, the highest effect is the best way of flow control, must fully understand the relationship between the flow adjustment of centrifugal pump and energy consumption.

Several main methods of regulating the flow rate of the centrifugal pump are analyzed by the characteristic curve of the centrifugal pump and the pipeline system: the adjustment of the outlet valve, the variable speed regulation of the pump and the series and parallel regulation of the pump. With the characteristic curves of the energy loss of pump outlet valve adjustment and speed adjustment in two ways, and compared it with the speed regulation, outlet valve regulating flow of traffic than you can better save energy, with centrifugal pump outlet valve: small, directly blocked the flow of liquid, but the work of the centrifugal pump energy did not decrease; if adopt variable speed control, reduce the speed of centrifugal pump, the corresponding reduction in the flow, so as to reduce the flow and energy saving.