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Multistage centrifugal pump

Tools for casting iron by centrifugal force

multistage centrifugal pump It is the combination of more than two centrifugal pumps with the same function, and the fluid channel structure is shown in the first stage medium Pressure relief port It is connected with the inlet of the second stage, and the medium pressure relief port of the second stage is connected with the inlet of the third stage. Such a mechanism in series forms a multistage centrifugal pump.

The significance of multistage centrifugal pump is to increase the set pressure.

Chinese name: Multistage centrifugal pump
Foreign name: Multistage centrifugal pump
Industry: Machinery manufacturing

Material: cast iron
Model: D
Performance: High head
working principle: Effect of centrifugal force

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▪ Basic cleaning principles

Product features

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1. The multi-stage centrifugal pump is a vertical structure with a small floor area. The center of gravity of the pump coincides with the center of the pump foot, so it runs stably, has small vibration and long service life.

2. The multi-stage centrifugal pump has the same caliber and is on the same horizontal centerline. It can be directly installed at any part of the pipeline without changing the pipeline structure, which is very convenient for installation.

3. Motor external Rain cover It can be directly placed outdoors for use without the need to build a pump room, greatly saving Infrastructure investment 。

Structural drawing of multistage centrifugal pump

4. The lift of multistage centrifugal pump can meet different requirements by changing the pump stages (number of impellers), so it has a wide range of applications. 　5、 Shaft seal use Hard alloy Mechanical seal , reliable sealing, no leakage, Mechanical loss Small.

6. High efficiency, energy saving and beautiful appearance.

7. Note: Internal casting with diameter above 50 is formed.

Scope of application

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Multistage centrifugal pump, which adopts the high efficiency and energy saving recommended by the state hydraulic model With high efficiency and energy saving, wide performance range Operation safety Stable, low noise, long life, easy installation and maintenance, etc; By changing the material and sealing form of the pump and adding a cooling system, hot water, oil, corrosive and abrasive media can be transported.

Type D pump is used to transport clean water or physical materials that do not contain solid particles and whose temperature is not higher than 80 ℃ chemical property Liquid similar to clean water, suitable for mines and cities Water supply and drainage engineering use.

DG type pump is used to transport clean water without solid particles and with a temperature not higher than 105 ℃ or liquid with physical and chemical properties similar to clean water Boiler feed water Or medium for transporting hot water or similar hot water.

MD pump is used to transport neutral materials with solid particle content no more than 1.5% Mineral water (particle size is less than 0.5 millimeter ）And other similar sewage, the temperature of the conveyed medium is not higher than 80 ℃, suitable for steel plants Mine drainage , sewage transportation, etc.

The delivery temperature of DF pump is - 20 ℃~105 ℃, without solid particles and corrosive liquid.

Horizontal multistage centrifugal pump

DY pump is used to transport oil and petroleum products 。

Inlet of above pumps Allowable pressure Not more than 0.6MPa.

Multistage centrifugal pump Structure diagram

Structural drawing of multistage centrifugal pump

performance parameter

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model	series	flow (m3/h)	lift (M)	speed (r/min)	Motor power (kw)	efficiency （%）	NPSH required (NPSH)	weight
25GDL2-12	three	one point four two two point four	thirty-six	two thousand and nine hundred	one point one	twenty-three thirty thirty-two	two point nine	fifty-eight
	four		forty-eight		one point one		two point nine	sixty-two
	five		sixty		two		two point nine	sixty-eight
	six		seventy-two		two		two point nine	seventy-two
	seven		eighty-four		two		two point nine	seventy-eight
	eight		ninety-six		two point two		two point nine	eighty-two
	nine		one hundred and eight		two		two point nine	eighty-six
	ten		one hundred and twenty		three		two point nine	ninety-eight
	eleven		one hundred and thirty-two		three		two point nine	one hundred and two
	twelve		one hundred and forty-four		three		two point nine	-
	thirteen		one hundred and fifty-six		four		two point nine
	fourteen		one hundred and sixty-eight		four		two point nine
	fifteen		one hundred and eighty		four		two point nine
25GDL4-11	three	two point eight four four point eight	thirty-three	two thousand and nine hundred	one point one	thirty-two forty-two forty-three	two point nine	fifty-eight
	four		forty-four		one point five		two point nine	sixty-five
	five		fifty-five		two point two		two point nine	seventy-two
	six		sixty-six		two point two		two point nine	seventy-six
	seven		seventy-seven		three		two point nine	eighty-six
	eight		eighty-eight		three		two point nine	ninety
	nine		ninety-nine		three		two point nine	ninety-four
	ten		one hundred and ten		four		two point nine	one hundred and ten
	eleven		one hundred and twenty-one		four		two point nine	one hundred and fourteen
	twelve		one hundred and thirty-two		four		two point nine	-
	thirteen		one hundred and forty-three		four		two point nine
	fourteen		one hundred and fifty-four		five point five		two point nine
	fifteen		one hundred and sixty-five		five point five		two point nine
model	series	flow (m3/h)	lift (M)	speed (r/min)	Motor power (kw)	efficiency （%）	NPSH required (NPSH)	weight
40GDL6-12	three	four point two six seven point two	thirty-six	two thousand and nine hundred	one point five	forty-three fifty-two fifty	two point nine	seventy-two
	four		forty-eight		two point two		two point nine	seventy-eight
	five		sixty		two point two		two point nine	eighty-two
	six		seventy-two		three		two point nine	ninety-two
	seven		eighty-four		three		two point nine	ninety-six
	eight		ninety-six		four		two point nine	one hundred and twelve
	nine		one hundred and eight		four		two point nine	one hundred and sixteen
	ten		one hundred and twenty		four		two point nine	one hundred and twenty
	eleven		one hundred and thirty-two		five point five		two point nine	one hundred and forty
	twelve		one hundred and forty-four		five point five		two point nine	-
	thirteen		one hundred and fifty-six		seven point five		two point nine
	fourteen		one hundred and sixty-eight		seven point five		two point nine
	fifteen		one hundred and eighty		seven point five		two point nine
50GDL12-15	two	eight point four twelve fourteen point four	thirty	two thousand and nine hundred	two point two	forty-nine fifty-seven fifty-five	three point five	one hundred and thirteen
	three		forty-five		three		three point five	one hundred and twenty-nine
	four		sixty		four		three point five	one hundred and forty-nine
	five		seventy-five		five point five		three point five	one hundred and eighty-one
	six		ninety		five point five		three point five	one hundred and ninety
	seven		one hundred and five		seven point five		three point five	two hundred and four
	eight		one hundred and twenty		seven point five		three point five	two hundred and twelve
	nine		one hundred and thirty-five		eleven		three point five	two hundred and sixty-five
	ten		one hundred and fifty		eleven		three point five	two hundred and seventy-three
50GDL18-15	two	twelve point six eighteen twenty-one point six	thirty	two thousand and nine hundred	three	fifty-four sixty-three sixty-two	four	one hundred and twenty-two
	three		forty-five		four		four	one hundred and forty-two
	four		sixty		five point five		four	one hundred and seventy-five
	five		seventy-five		seven point five		four	one hundred and eighty-nine
	six		ninety		seven point five		four	one hundred and ninety-eight
	seven		one hundred and five		eleven		four	two hundred and fifty-two
	eight		one hundred and twenty		eleven		four	two hundred and sixty-one
	nine		one hundred and thirty-five		fifteen		four	two hundred and eighty
	ten		one hundred and fifty		fifteen		four	two hundred and eighty-nine

matters needing attention

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1. Pre startup inspection of multistage centrifugal pump

Whether the name, model, main performance and filling quantity of lubricating oil meet the requirements Technical documents Requirements; Bearing lubrication system , sealing system and Cooling system Whether it is in good condition, and whether the oil and water paths of the bearing are unblocked;

Turn the rotor of the pump for 1-2 revolutions, and check whether there is friction or seizure of the rotor;

stay coupling Nearby or belt Protective device Whether there are sundries hindering rotation;

Pump Bearing pedestal Motor foundation Foundation bolt Whether it is loose;

Multistage centrifugal pump

The valve or accessory device of the pump working system shall be at the position with the minimum load when the pump is running, and the outlet shall be closed Regulating valve ；

Start the multistage centrifugal pump and check whether the impeller rotation is consistent with the design rotation. If not, the impeller must be completely stopped and the motor wiring must be adjusted before starting again.

2. Multi stage centrifugal pump water filling

Before starting the pump, the pump casing and suction pipe must be filled with water, because the vacuum of multistage centrifugal pump suction cannot be formed and maintained in the presence of air.

3. Multi stage centrifugal pump warming

Pumps for delivering high-temperature liquids, such as those in power plants Boiler feed pump Warm up the pump before starting the multistage centrifugal pump. that is because Feed pump During startup, high temperature feed water flows through the pump, making the temperature of the pump body rise quickly from normal temperature to 100~200 ℃, which will cause the temperature difference between the inside and outside of the pump and between various components. Without sufficient heat transfer time and appropriate measures to control the temperature rise, uneven expansion of the pump will occur everywhere, causing deformation, wear, vibration and bearing axle seizure accidents of various parts of the pump body.

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Cleaning items

1、 Scrape off the inner and outer surfaces of the impeller and Sealing ring The scale and rust accumulated in the bearing and other places shall be cleaned and blown with water or compressed air.

2、 Clean the deposits on the joint surfaces of the shell Oil stain And rust.

3、 Clean the water seal pipe and check whether the pipe is unblocked.

4、 Cleaning bearing bush And bearing, remove oil dirt, and Cleaning oil Ring and oil level gauge, etc. Ball bearing Use gasoline for cleaning.

5、 Parts and components not to be assembled temporarily shall be protected with oil after cleaning.

Basic cleaning principles

1. Ensure that the requirements for cleanliness of parts are met. During repair, different parts have different requirements for cleanliness. In assembly, the cleaning requirements of mating parts are higher than those of non mating parts, and that of moving mating parts are higher than Static fit Precision parts are higher than non precision parts. For the surfaces of sprayed, plated and bonded workpieces, the cleaning requirements are very high. Different cleaning agents and cleaning methods must be adopted according to different requirements

Methods to ensure the required cleaning quality.

2. Prevent corrosion of parts, and do not allow any degree of corrosion of precision parts. When the parts need to be parked for a period of time after cleaning, the antirust ability of the cleaning solution or other antirust measures should be considered.

3. Ensure operation safety, and prevent fire or poisoning to human body and environmental pollution.

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