Comparison of the scope and characteristics of the pump
According to the structural characteristics of different pumps, the application of the pump is as follows:
Xinke centrifugal pump
Centrifugal pump has a simple structure, no pulsation of infusion, flow regulation
Simple and so on, so the centrifugal pump should be used as much as possible except in the following cases:
(1) When there is a measurement requirement, the metering pump is selected.
(2) The head requirements are very high, the flow rate is small, and there is no suitable small flow rate. The high lift centrifugal pump can be used with optional reciprocating pump; if the cavitation requirement is not high, the vortex pump can also be used.
(3) When the head is very low, the axial flow pump and the mixed flow pump can be selected when the flow rate is large.
(4) When the medium viscosity is large (>650~1000mm2/s), the rotor pump can be considered, such as: screw pump or reciprocating pump; when the viscosity is particularly large, a specially designed high viscosity screw pump and high viscosity reciprocating pump can be selected. .
(5) When the medium gas content is >5%, the flow rate is small and the viscosity is <37.4mm2/s, a vortex pump can be selected. If the flow rate is allowed to pulsate, a reciprocating pump can be used.
(6) For occasions with frequent start-up or inconvenient pumping, pumps with self-priming performance, such as self-priming centrifugal pumps, self-priming vortex pumps, and self-priming positive displacement pumps, should be used.
How does the centrifugal pump work?
The centrifugal pump relies on the action of the rotating impeller on the liquid to transfer the mechanical energy of the prime mover to the liquid. Since the action liquid flows from the impeller inlet to the outlet, the speed energy and the pressure energy are increased, and the liquid discharged by the impeller passes through the press chamber, and most of the speed can be converted into pressure energy, and then sent out along the discharge line. At the inlet of the impeller, a vacuum or a low pressure is formed due to the discharge of the liquid, and the liquid in the liquid pool of the suction port is pressed into the inlet of the impeller under the action of the liquid surface pressure (atmospheric pressure), so that the rotating impeller continuously Inhale and drain fluid.
1. Self-priming clean water pump: The quality of the water source is relatively good relative to the fixed working position. The pipeline is stable within 3.5 meters. It can be used to reduce the water filling when pumping water in the water well and the orchard irrigation. The actual lift is below 22 meters. Poor working efficiency chemical pump. In the first run, the circulating emptying water should be added first, and the pump can complete the self-priming.
2, water-filled clean water pump: water quality, good mobility, large pipelines are relatively unfixed, the actual lift within 2.5 meters of the suction range is within 32 meters, the pump flow can be arbitrarily adjusted according to needs, suitable for seeding professional households to spray pesticides, irrigation water supply, work More efficient. The suction pipe should ensure a good seal.
3. Submersible clean water pump: The water source has sufficient head and the valve is suitable for irrigation with large amount of water in farmland orchards. As the submersible pump is placed in the water, the axial pushing water rises, and reducing the water output will increase the pump load. Therefore, do not install a valve in the outlet pipe of the submersible pump to prevent the motor from being burned out due to excessive resistance of the pump when the valve is turned off.
昕科Submersible sewage pump
It can tear, cut and discharge the long fibers, bags, belts, grass and cloth strips in the sewage, and then discharge them smoothly. It is especially suitable for conveying liquids containing hard solids and fibrous materials as well as particularly dirty, sticky and slippery liquids.
advantage:
Compared with general horizontal pumps or vertical sewage pumps, sewage pumps have the following advantages:
1. Compact structure and small footprint. Because the submersible pump works under submerged liquid, it can be installed directly in the lagoon without the need to build a special pump room to install the pump and machine, which can save a lot of land and infrastructure costs.
2. Easy to install and maintain. The small sewage pump can be installed freely. The large sewage pump is usually equipped with an automatic coupling device for automatic installation, which is quite convenient for installation and maintenance.
3. Continuous operation time is long. The sewage pump is coaxial with the pump and the motor, the shaft is short, and the rotating parts are light in weight. Therefore, the load (radial) on the bearing is relatively small, and the service life is much longer than that of the general pump.
4. There are no problems such as cavitation damage and irrigation water. In particular, the latter point brings great convenience to the operator.
Disadvantages:
The most critical problem for the sewage pump is the reliability problem, because the sewage pump is used under the liquid; the medium to be transported is some mixed liquid containing solid materials; the pump is close to the motor; the pump is arranged vertically The weight of the rotating part is in the same direction as the impeller is subjected to water pressure. These problems make the sewage pump have higher requirements in sealing, motor bearing capacity, bearing arrangement and selection than the general sewage pump.
Features:
1. It has strong sewage discharge capacity and no clogging. It can effectively pass solid particles with diameter φ30～φ80mm.
2. The tearing mechanism can tear the fiber and cut it off, then discharge it smoothly without adding a strainer to the pump.
3. The design is reasonable, the supporting motor power is small, and the energy saving effect is remarkable.
4. With the latest material mechanical seal, the pump can run safely for more than 8000 hours.
5. Compact structure, easy to move, simple installation, can reduce construction cost, no need to build pump room.
6. Can be used within the full lift range to ensure motor overload.
7. The float switch can automatically control the start and stop of the pump according to the required water level change, without the need for special care.
8. Double-rail automatic installation system, which brings great convenience to installation and maintenance, and people can enter and exit the sump without having to.
9. Equipped with fully automatic protection control box to effectively protect the product from leakage, water leakage and overload, which improves the safety and reliability of the product.
Xinke Submersible pump
Submersible pump uses and features:
Submersible pumps are mainly used in municipal engineering, industry, hospitals, buildings, hotels, restaurants and other industries. It is used to discharge sludge, waste water and urban domestic sewage with solid and various long fibers (including corrosive and aggressive media).
The submersible pump is small in size, compact in structure and high in efficiency. It can automatically control the water level according to user requirements, and is equipped with automatic protection device and control cabinet, double rail automatic installation system and so on.
The pipeline pump is a novel pump for conveying pipeline pressure and solving the pipeline pressure too low, which has great advantages over the horizontal centrifugal pump currently used. The superiority of the pipeline pump is mainly reflected in the following points:
1. The pipeline pump is compact and the pump is integrated. The vertical structure has a small installation area, stable operation, and no adjustment for installation.
2. The pump inlet and outlet are designed to be the same flange and are located on the same center line. They can be installed directly on the official road as a valve, and the center is low, which is convenient for pipeline layout and easy to install.
3. The pump is coaxial with the motor, and the axial size section makes the pump run more smoothly and has low noise.
4. Cancel the traditional shaft sealing method, avoiding the external irrigation of the conveying medium, so it has the remarkable feature of no leakage.
Screw pump
Characteristics
1. It can also transport a medium containing gas under negative pressure.
2. It can transport liquids containing fibrous matter and solid particles.
3. Good self-priming performance and good inhalation performance.
4. Can be transported in reverse.
5. The mechanical vibration is small, no pulsation, and the operation is stable.
6. It can transport all media that are very viscous and watery.
Working principle: When the screw pump is working, the liquid enters the sealed space surrounded by the thread and the pump casing. When the active screw rotates, the screw pump seal volume increases the screw pump pressure under the screw extrusion and along the axial direction. mobile. Since the screw rotates at a constant speed, the liquid outflow rate is also uniform.
Screw pump
Through its special three-dimensional spiral blade, the volumetric reasoning action of the spiral and the centrifugal action of the blade are organically combined to obtain energy. Therefore, it combines the characteristics of a positive displacement pump and a vane pump, and is a combination of the two. Compared with ordinary impurity pump and swirl pump, it has the following advantages: good non-blocking performance; good non-destructive performance; high efficiency, wide area of high efficiency; flat power curve; good regulation performance; good suction performance of pump; Anti-cavitation performance; can also transport oil-water mixture without emulsification. The spiral centrifugal pump is a new type of non-blocking pump, which has a wide application prospect in the paper industry, fishery, sugar industry, food, metallurgy, environmental protection, chemical industry and other industries and sewage treatment operations.
Centrifugal slurry pump
The centrifugal slurry pump is a conveying device that directly obtains energy through the centrifugal centrifugal action of the working wheel blades.
Centrifugal slurry pump features:
1. The pump flow has a wide range of applications.
2. The centrifugal slurry pump has a wide adaptability to materials.
3. The delivery head is relatively low
4. There are more wearing parts and replacement is more frequent.
5. Centrifugal pump is simple in structure, light in weight, easy to operate, low in cost and widely used.
6. Centrifugal slurry pumps are less efficient than volumetric.
The application range of centrifugal slurry pump is generally used for the lifting and conveying of solid material slurry such as close-range and low-lift concentrate, tailings, ore, ash, sediment, slime and sediment. Directly or indirectly connected in series, within a few kilometers of transport distance, sometimes economically reasonable, especially suitable for larger flow, coarser grain slurry pipeline system.