Overview of Clean Water Pump

1.1 This series of pumps is a single-stage single suction cantilever centrifugal pump, designed for pumping at 80 ℃The following clear water and its physical and chemical properties are similar to waterFor liquids without solid particles, ISY pumps are used for transporting light oils such as gasoline and diesel, and ISR pumps are used for transporting 130 ℃The following hot water.1.2 This series of pumps has 34 basic types, and by cutting the impeller diameter and variable speed, 242 performance options can be obtained for users to choose from.
1.3 This series of pumps complies with the following national standards:
GB5662-85 "Marking, performance and dimensions of axial suction centrifugal pumps (16 bar)", CB5661-85 "Dimensions of cavities for mechanical seals and soft packing of axial suction centrifugal pumps", GB5657-85 "Technical conditions for single-stage single suction centrifugal pumps for clean water"
The IS type pump produced by our factory can also be used as a circulating pump.
a. The test pressure for the pump body and pump cover is 2.4MPa (user instructions).
b. The inlet and outlet flanges of the pump adopt the flat flanges (without protrusions on the sealing surface) specified in the national standard GB2556-81 "Shape and Dimensions of General Purpose Pipe Flange Seals".
C. Add a product grade with a flow rate of 160m ³/h according to the international standard ISO2858.
1.5 Pump model meaning: such as IS125--80-160A (J) - S1, ISY125-80-160Z
IS - Single stage centrifugal pump that meets international standards
ISY single-stage centrifugal oil transfer pump ISR single-stage centrifugal hot water pump
125 suction diameter (mm)
80 row outlet diameter (mm)
160- nominal diameter of impeller (mm)
A - Initial cutting of impeller outer diameter Z - Impeller outer diameter
(J) - Design a pump with a speed of 200/mimn and operate it at a reduced speed of 1450/mim
S1 internal mechanical seal (not specified for packing seals)
The transmission mode of the 1.6 pump is connected to the motor through an elastic coupling, and when viewed from the direction of the prime mover, the pump rotates clockwise.
2. Structural description
21 IS typePump system according to international standardsAccording to the performance and dimensional design specified in IS02858, in addition to the pump body, other parts such as the system cover, impeller, shaft seal ring, shaft sleeve, and suspension rolling bearings constitute the rotor components.
The rotor components are connected to the pump body with bolts, and the entire component can be removed during maintenance without the need to move the sampling body and inlet and outlet pipelines. Pump without bodyThe pump body and pump cover form the working chamber of the pump.
To balance the axial force of the pumpMost pumps are equipped with sealing rings before and after the impeller, and there are balance holes on the impeller cover plate. Due to the small lateral force, there is no sealing ring or balance hole on the back of the impeller, and the axial force is borne by the dynamic shaft.
2.2 Pump shaft seal structure.

2.2.1 The axial soft packing sealing system of the pump is composed of packing gland, packing ring, and packing to prevent air intake or large water leakage. If the impeller of the pump has a balance hole, the cavity filled with soft packing is connected to the suction port of the impeller. If the liquid at the impeller is in a vacuum state, it is easy for air to enter along the surface of the shaft sleeve. Therefore, a packing ring is installed in the packing chamber, and the pressure water in the pump chamber is led to the packing ring for sealing through the water inlet of the pump cover. To avoid shaft wear, a shaft sleeve protection is installed at the part where the shaft passes through the packing chamber. A 0-shaped sealing ring is installed between the shaft sleeve and the shaft to prevent air intake or water leakage along the mating surface.
2.2.2 The mechanical seal system of the pump is composed of a gland, a flat gasket, a retaining ring, a short shaft sleeve, and mechanical seals, and belongs to a single end non-equilibrium mechanical seal. The main installation dimensions of mechanical seals comply with DIN24960 standard. Figure 2 shows the relevant dimensions for users to refer to when replacing. If the axial dimension of the mechanical seal replaced by the user is longer, the s value can be reduced or the length of the short shaft sleeve can be reduced (when S=0). For pumps with mechanical seals, a throttling plug should be installed at the end of the water hole on the pump cover to allow a small amount of water to enter the packing chamber.
2.2.3 The rubber oil seal system of the pump is mostly used for ISY type oil transfer pumps, which consists of a packing gland, a common skeleton rubber oil seal, and an oil sealing ring. The sealing ring is filled with lubricating grease to lubricate the movement between the shaft sleeve and the oil seal. When using rubber oil seals, there are no small holes on the pump cover to guide pressure fluid to the packing chamber.
Add a cooling chamber cover between the pump cover and suspension body of the ISR type hot water pump, and fill the cavity between the cooling chamber cover and the pump cover with cooling water to cool the shaft seal to prevent heat from transferring to the bearings.
When delivering hot water, the inlet pressure of the pump should not be lower than the specifications in the table below to avoid cavitation.