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Horizontal Multistage PUMPS BJZ75
This centrifugal pump and motor assembly is a heavy duty, single phase, Open Drip Proof (ODP) electric motor that features an easy service design and back pullout design. All models include replaceable wear ring and provide for easy winterizing and close grained cast iron. This pump is used in water supply systems for homes, farms and industry.
Our centrifugal pump and motor assemblies are ideal for homeowners looking to water their lawns, farms and industrial facilities. The assembly includes a single phase electric motor with large horsepower that delivers the volume of water you need. Its replaceable wear ring allows for effective replacement while maintaining proper operation. This assembly also comes with a four-position discharge which results in high efficiency.
Product parameters
Model | Power(P₂) KW | （Amps） | Rated head (m) | Rated flow (m3/h) | (kg) | Packing size (mm) | Container QTY (Qty/20') | |
|---|---|---|---|---|---|---|---|---|
| 220V/50Hz | 380V/50Hz | |||||||
| BJZ75 | 0.55 | 3.8 | 1.4 | 22 | 2.2 | 9 | 385X200X280 | 1300 |
About this item
Low power consumption, good heat dissipation effect, convenient operation and easy maintenance.
The shell is made of anti corrosion material, which does not deform at a temperature of 45℃.
Using mechanical sealing and NSK bearing, very quiet during operation, convenient and practical.
The transparent cover makes inspection more convenient, suitable for swimming pool filtration.
The connector of this product can be connected for metric system and British system water pipes.
Product Description
This cast iron centrifugal pump and motor assembly, comes with large horsepower, single phase, ODP (Open Drip Proof) electric motor. This heavy-duty motors, easy service design and four-position discharge. All models include replaceable wear ring and feature back pull-out design. Provides for easy winterizing and close grained cast iron. It is use in water systems and sprinkling for homes, farms and industry.
Product Feature
- The water flowing in the centrifugal pump is inhaled along the axial direction of the impeller and flows out perpendicular to the axial direction, that is, the direction of the water flow in and out is 90° to each other.
- Since the centrifugal pump relies on the inlet of the impeller to form a vacuum to absorb water, it is necessary to inject water into the pump and the suction pipe before starting, or use a vacuum pump to exhaust air to form a vacuum, and the pump casing and suction pipeline must be strictly sealed. Air leakage, otherwise will not form a vacuum, and it will not be able to absorb water.
- Since it is impossible to form an absolute vacuum at the inlet of the impeller, the suction height of the centrifugal pump cannot exceed 10 meters. In addition, the loss along the way caused by the water flowing through the suction pipeline, the actual allowable installation height is much less than 10 meters. If the installation is too high, it will not absorb water; in addition, since the atmospheric pressure in the mountainous area is lower than that in the plain, the installation height of the same water pump in the mountainous area should be lowered, otherwise it will not be able to absorb water.
Structure of centrifugal pump
There are many kinds of centrifugal pumps, including single-stage single-suction centrifugal pumps, single-stage double suction centrifugal pumps, vertical single-stage centrifugal pumps, and vertical multi-stage centrifugal pumps commonly used in our irrigation area.
Single stage single suction centrifugal pump
A type of horizontal centrifugal pump is mainly composed of a pump body, pump cover, impeller, shaft, sealing ring, shaft sleeve, and suspension bearing. The type pump body and pump cover are divided from the back of the impeller, which is commonly known as the back door structure. Its advantage is that it is convenient for maintenance. During maintenance, the pump body, suction pipeline, discharge pipeline, and motor are not moved. Just remove the intermediate connection of the extended coupling, and then exit the rotor part for maintenance.
The pump housing (i.e. pump body and pump cover) constitutes the working chamber of the pump. The impeller, shaft, and rolling bearing are the rotors of the pump. The suspension bearing component supports the rotor part of the pump, and the rolling bearing is subject to the radial force and axial force of the pump. To balance the axial force of the pump, sealing rings are set in front and behind the impellers of most pumps, and balancing holes are set on the cover plate behind the impellers. Because some pumps have little axial force, sealing rings and balancing holes are not set on the back of the impellers.
The axial seal ring of the pump is composed of a packing gland, packing ring, and packing to prevent air inlet or a large amount of water leakage. If the impeller of the pump is balanced, the cavity with soft packing is connected with the suction inlet of the impeller. If the liquid at the inlet of the impeller is in a vacuum state, it is easy to air along the surface of the shaft sleeve. Therefore, a packing ring is installed in the packing cavity, and the pressure water in the pump chamber is led to the packing ring through the small hole on the pump cover for sealing. If the impeller of the pump has no balance hole, there is no air leakage problem because the liquid pressure on the back of the impeller is greater than the atmospheric pressure, so the packing ring can not be installed. To avoid shaft wear, a shaft sleeve is installed at the part where the shaft passes through the packing cavity for protection. There must be an O-ring between the shaft sleeve and the shaft to prevent air intake or water leakage along the mating surface.
The transmission mode of the pump is connected with the motor by lengthening the elastic coupling. The rotation direction of the pump is clockwise from the driving end.
Single stage double suction centrifugal pump
The suction inlet and discharge outlet of the SH single-stage double suction pump are below the axis of the pump, and the horizontal direction is vertical to the axis and the pump shell It is not necessary to disassemble the water inlet during maintenance. The discharge pipeline and the motor (or another prime mover) can be seen from the direction of the coupling to the pump, and the water pump rotates in the reverse direction. It can also be changed to clockwise needle rotation according to the special order needs of users.
The other main parts of the SH single-stage double suction pump are the pump body, pump cover, impeller, shaft, double suction seal ring, shaft sleeve, bearing, etc. Except that the shaft is made of high-quality carbon steel, the rest are mostly made of cast iron.
The pump body and the pump cover form the working chamber of the impeller. The inlet and outlet flanges are provided with pipe screw holes for installing vacuum gauges and pressure gauges, and the lower part of the inlet and outlet flanges is provided with pipe screw holes for discharging water.
After static balance verification, the impeller is fixed with the shaft sleeve and the shaft sleeve nuts on both sides. Its axial position can be adjusted by the shaft sleeve nuts. The axial force of the impeller is balanced by the symmetrical arrangement of its blades, and there may be some residual axial force borne by the bearing at the coaxial end.
The S-type pump is supported by rolling bearings with a shaft diameter less than 60mm at the bearing, which is called an A-type SH type pump; The bearing larger than 70mm is supported by Babbitt sliding bearing, which is called a B-type sh pump. Now many pumps larger than 70mm also use rolling bearings. The type of pump is supported by two single-row radial ball bearings, which are installed in the bearing bodies at both ends of the pump body and lubricated with grease. The double suction sealing ring is used to reduce the water leakage of the water pressure chamber of the pump back to the suction chamber.
The water pump is directly driven by the motor through the coupling.
The shaft seal is a soft packing seal. To cool and lubricate the sealing cavity and prevent air from leaking into the pump, there is a water seal ring between the packing. When the pump is working, a small amount of high-pressure water flows into the packing cavity through the water seal pipe to act as a water seal.
Application field
① In the production of chemical and petroleum sectors, most of the raw materials, semi-finished products and finished products are liquids, and the production of semi-finished and finished raw materials into semi-finished products and finished products needs to go through complex technological processes. During these processes, pumps play a role in transporting liquids and providing pressure flow for chemical reactions. In addition, in many installations, pumps are used to adjust the temperature.
② In agricultural production, pumps are the main irrigation and drainage machinery. my country's rural areas are vast, and a large number of pumps are needed in rural areas every year. Generally speaking, agricultural pumps account for more than half of the total output of pumps.Pumps are also the most used equipment in the mining and metallurgical industries. The mine needs to be drained by pumps, and in the process of beneficiation, smelting and rolling, pumps are needed to supply water.
③ In the power sector, nuclear power plants need nuclear main pumps, secondary pumps, and tertiary pumps, and thermal power plants need a large number of boiler feed pumps, condensate pumps, oil and gas mixing pumps, circulating pumps, and ash pumps.
④ In national defense construction, the adjustment of aircraft flaps, tail rudders and landing gear, the rotation of warships and tank turrets, and the ups and downs of submarines all require pumps. High pressure and radioactive liquid, and some also require the pump without any leakage.
⑤ In short, whether it is aircraft, rockets, tanks, submarines, drilling, mining, trains, ships, or everyday life, pumps are needed everywhere, and pumps are running everywhere. That's why the pump is listed as a general-purpose machine, which is a major product in the machinery industry.
⑥ Electric pumps, i.e. pumps driven by electricity. The electric pump is composed of a pump body, a water lift pipe, a pump base, a submersible motor (including cables) and a starting protection de
