Hello, I would like to ask for advice, centrifugal pump, used to discharge acid, may not be designed

1. All kinds of highly toxic, flammable and volatile liquids. Such as benzene and other toxic substances 2, all kinds of strong acids, strong alkalis, strong corrosive liquids. Such as aqua regia, caustic soda, etc. 3, all kinds of high-temperature liquids can withstand 150.

4. As a pre-pressure supply device for various solid-liquid separation equipment. 5. Pump peanut butter, kimchi, mashed potatoes, small red sausage, jam apple syrup, chocolate, etc. 6. Pump paint, gum and pigment.

7. Adhesives and glues, all kinds can be sucked by pumps. 8. All kinds of tile, porcelain, brick and pottery glaze. 9. After the oil well is drilled, the sediment and grout are sucked by pump.

10. Pump all kinds of emulsions and fillers. 11. Pump all kinds of sewage. 12. Use the pump as the oil tanker, and the barge clears the warehouse to absorb the sewage in the warehouse.

13. Pump sucking water in mines, tunnels, tunnels, beneficiation and slag. Pumping cement grout and mortar. 14. All kinds of rubber slurry....

Mineral processing, coal, water treatment and marine sectors.

The choice of centrifuge is based on the size and concentration of solid particles in the suspension (or emulsion), the density difference between the solid and the liquid (or both), the viscosity of the liquid, and the characteristics of the filter residue (or sediment). You can refer to the "Selection Guide for Selection and Safe Use of Centrifuges".

**。The difference between domestic centrifuges and imported centrifuges is not very big, and the core technology of centrifuges has been mastered in China. The difference between centrifuges of the same grade is not very large

If you don't fill water, the centrifugal pump centrifugal air, the air density is small, the negative pressure generated is not enough to pump out the water, there is air will produce air binding, when the centrifugal pump is working, the impeller will produce a vacuum state, and the liquid will be sucked in by self-priming.

...When the centrifugal pump is working, a vacuum will be generated at the impeller, and the liquid will be sucked in by self-priming.

Pumping pump, self-priming pumping pump, also known as vacuum pump, does not need to fill water before pumping, due to the special design of the pump casing. Its sealing performance is higher than that of general centrifugal pumps, and the water in the pump casing will not be automatically emptied after the motor is stopped, and the motor drives the turbine to rotate at high speed, which quickly forms negative pressure (vacuum) in the pump. The water is pressed to the pump casing by atmospheric pressure, and then the centrifugal head is transported to various places under the action of pressure.

The use of atmospheric pressure to pump water, without exhausting the air, the pressure cannot be established.

The centrifugal pump design point refers to the working condition point corresponding to the highest pump efficiency; The working point of the centrifugal pump refers to the intersection of the head-flow curve of the pump and the required head curve.

The parameters of the centrifugal pump design point are the parameters marked on the nameplate of the centrifugal pump, including the main parameters such as flow, head, power, and cavitation allowance. When choosing a centrifugal pump, it is generally as follows: design point flow value = multiple of the working point flow value.

The popular interpretation of the working point of the centrifugal pump is that the working point corresponding to the actual head or actual flow of the centrifugal pump in the actual pipeline system. If the operating point happens to be the design point (actual flow = design point flow), it is ideal. In actual operation, the actual flow value of the centrifugal pump is allowed to deviate from the design flow value within 30%.

For some centrifugal pumps (e.g. horizontal split double suction centrifugal pumps), the deviation of the flow value is too large, resulting in the serious consequences of the pump breaking the shaft.

The design point refers to the point with the highest working efficiency of the centrifugal pump, the working point refers to the connection between the centrifugal pump and the pipeline in the actual transportation process, and the intersection point of the characteristic curve of the centrifugal pump and the characteristic curve of the pipeline refers to the flow rate and efficiency under the actual work. Generally speaking, the design point is a definite value, and the work point should be guaranteed to fall within a certain range.

It is also divided into clean water pump and impurity pump, because the medium conveyed is different, the wear is different, and the starting point is also different when selecting the model.

1. Types of centrifugal pumps:

1. Classification according to the number of impellers: 1) Single-stage pump: that is, there is only one impeller on the pump shaft; 2) Multistage pump:

That is, there are two or more impellers on the pump shaft, and the total head of the pump is the sum of the heads generated by n impellers.

2. Classified according to working pressure: 1) Low-pressure pump: the pressure is lower than 100 meters of water column; 2) Medium pressure pump: the pressure is between 100 650 meters of water column; 3) High-pressure pump: the pressure is higher than 650 meters of water column.

3. Classification according to the impeller suction method: 1) Single-side inlet pump: also known as single-suction pump, that is, there is only one water inlet on the impeller; 2) Double-sided inlet pump:

It is also called a double suction pump, that is, there is a water inlet on both sides of the impeller. It has a flow rate twice as large as a single-suction pump and can be seen as having two single-suction impellers placed back-to-back.

4. Classified according to the combination of pump casing: 1) Horizontal open pump: that is, there is a joint joint on the horizontal plane through the axial line. 2) Vertical joint surface pump: that is, the joint surface is perpendicular to the axis line.

5. Classified according to the position of the pump shaft: 1) Horizontal pump: the pump shaft is located in a horizontal position. 2) Vertical pump: the pump shaft is located in the vertical position.

6. Classification according to the way of impeller discharge: 1) Volute pump: After the water comes out of the impeller, it directly enters the pump casing with a spiral shape. 2) Guide vane pump: After the water comes out of the impeller, it enters the guide vane set outside it, and then enters the next stage or flows into the outlet pipe.

7. Classification according to installation height: 1) Self-filling centrifugal pump: the pump shaft is lower than the surface of the suction pool, and there is no need for irrigation when starting, and it can be started automatically.

2) Suction centrifugal pump (non-self-filling centrifugal pump): the pump shaft is higher than the surface of the suction pool. Before starting, it is necessary to fill the pump casing and suction pipe with water, and then drive the motor to make the impeller rotate at high speed, the water is thrown out of the impeller by centrifugal force, and the center of the impeller forms negative pressure, and the water in the suction pool enters the impeller under the action of atmospheric pressure, and is subjected to the action of the impeller of high-speed rotation, and is thrown out of the impeller and enters the pressurized water pipeline.

8. It can also be classified according to the use: such as oil pump, water pump, condensate pump, ash discharge pump, circulating water pump, etc.

Second, about centrifugal pumps:

The centrifugal pump uses the rotation of the impeller to make the water centrifugal move to work. Before the pump starts, the pump casing and suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and water to do high-speed rotation movement, and the water undergoes centrifugal movement, which is thrown to the outer edge of the impeller and flows into the pressurized water pipeline of the pump through the flow channel of the snail pump casing.

The characteristic curve of the centrifugal pump is independent of the pipeline, when the centrifugal pump is installed in a specific pipeline system to work, the actual working head and flow rate are not only related to the performance of the centrifugal pump itself, but also related to the characteristics of the pipeline.

The characteristic curve of the centrifugal pump is determined at the time of delivery, which is only related to its design characteristics, structural characteristics, and accessories standards. Regardless of the piping system connected at the time of later installation!

There is no relationship between the performance curve and the tubing. It only represents the performance range that can be achieved by the pump itself.

-Suhua Pumps.

Remove the exhaust valve.

Change it or send it to the manufacturer.

The centrifugal pump performance curve is based on the design intent of the pump and the actual test, and is usually plotted using the Decarer first coordinate system. Its horizontal coordinates indicate the flow rate of the pump, the longitudinal coordinates represent the head of the pump, and the flow rate and head curve of a particular centrifugal pump are a downward curved line, indicating that the pump head decreases and its flow rate increases. In this coordinate, there is also a power curve, which is an upward curve that indicates that the power of the pump increases as the flow rate increases, and the head decreases and the power decreases.

There is also an efficiency curve, which is a curve with a high middle and low on both sides, indicating that the middle part of the efficiency is the highest, and the efficiency of the two parts is decreasing. Therefore, when we choose a pump, we should make the flow rate and head of the pump fall on the attachment at the highest point of the efficiency curve.