2SK series two-stage water ring vacuum pump

12SK series two-stage water ring vacuum pumpProduct Introduction:

The 2SK series two-stage water ring vacuum pump is equivalent to using two SK series water ring vacuum pumps in series. Due to the fact that the SK series water ring vacuum pump can only achieve a maximum vacuum degree of -700mmHg, the 2SK series vacuum pump was developed domestically in the 1980s to achieve higher vacuum and larger pumping rates under high vacuum conditions. With the emergence of the new generation of energy-saving products in the 2BV and 2BE1 series, the 2SK series will gradually be replaced. The 2SK-P1 series two-stage water ring vacuum pump atmospheric jet pump unit mainly operates at an absolute pressure of 10-50mmHg, but its efficiency is relatively low in the high vacuum zone. If long-term operation is required, the Roots water ring vacuum unit can be selected to achieve the best pumping efficiency in the high vacuum zone.

2SK series two-stage water ring vacuum pumpModel Description

IIKey Features:

1. Compared to the SK series single-stage water ring vacuum pump, it has the characteristics of high vacuum degree and high pumping speed in high vacuum areas

2. At the same pumping rate, the shaft power is significantly higher than that of the 2BV and 2BE1 series

3. Due to the double bladed wheel structure, manufacturing and maintenance are relatively complex, and there are many vulnerable parts.

IIIThe working principle of

　　 The working principle is shown in Figure 1. The impeller (5) is eccentrically installed inside the pump body (3). When the impeller rotates, water is thrown out in all directions by centrifugal force, forming a rotating water ring (6) between the inner wall of the 2SK water ring vacuum pump body and the impeller. The upper inner surface of the water ring is in contact with the impeller hub. When the impeller rotates clockwise, during the first half of the rotation, the inner surface of the water ring gradually separates from the hub, and the cavity formed between adjacent blades gradually increases. The extracted gas is continuously sucked into the cavity through the pump inlet pipe (4) and the crescent shaped suction hole (7); During the second half of the rotation, the inner surface of the water ring gradually approaches the hub, and the cavity between the two adjacent blades gradually shrinks. The gas is compressed, so the pressure continues to increase. When the pressure increases to greater than the external pressure, the gas is discharged, continuously pumping away the gas in the sealed container, forming a certain vacuum.

　　 Identification of working principle diagram

The atmospheric jet vacuum pump is a type of jet pump, and its working principle is briefly described as follows:The function of the vacuum pump is to create a certain pre vacuum in the container being pumped. When the maximum vacuum of the pump is reached, the atmospheric pump is turned on. At this time, the pressure difference between the external atmosphere (or pressurized gas) and the intake pipe is very large. Under the action of this pressure difference, the atmosphere (or pressurized gas) is rapidly drawn into the suction pipeline. After passing through the nozzle of the large air pump, the airflow velocity further increases, and the pressure rapidly decreases, resulting in a higher vacuum inside the nozzle (obviously higher than the maximum vacuum of the pump), which continues to suck the gas being pumped into the pump.

4Structural Description

Extraction volume of 1.5m3/min or moreThe structure is shown in Figure 2. The long and short impellers 17 and 16 are fixed to the shaft 2 with keys, and the two impellers are positioned in the middle with a shaft sleeve 20 and locked with a round nut, forming the entire rotor part. They are eccentrically installed in the pump body and supported on two single row radial ball bearings. The rotating part is connected to the motor shaft with a coupling 18, so that it rotates at the same speed as the motor. The long impeller 17, the long pump body 9, and the suction part form the high vacuum stage, while the short pump body 5, the short impeller 16, and the discharge part form the low vacuum stage. The exhaust port of the high vacuum stage and the suction port of the low vacuum stage are connected by a connecting pipe (2SK-1.5 does not have this connecting pipe) to form a two-stage series connection. Separated by a middle wall (A) 7 and a middle wall (B) 6, the middle wall (A) has an exhaust hole and the middle wall (B) has an intake port.

2SK-0.4、2SK-0.8，The structure is shown in Figure 3, and its high and low vacuum level structure is basically the same as the pump shown in Figure 2 (without connecting pipes). Using a specially designed extended shaft motor, the long and short impellers are fixed to the shaft with keys, but can be floated axially and eccentrically placed inside the long and short pump bodies.
　　 The sealing at both ends adopts oil immersed asbestos packing or mechanical seal.
One end of the high vacuum stage has a water inlet hole, through which supplementary water enters the long pump body of the high vacuum stage. The supplementary water of the low vacuum stage is discharged from the high vacuum stage. (2SK-12, 2SK-20, 2SK-30 low vacuum level makeup water is also supplied from the water supply pipe, but its amount needs to be adjusted through a valve). The high and low vacuum levels are firmly connected together by tightening bolts.
The atmospheric jet pump is composed of an intake pipe, a nozzle, an atmospheric valve body, and a diffuser.

5Product Parameters:

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