In the process of using vacuum brick machine, the most commonly used are water ring DVE vacuum pump (2SK type water ring DVE vacuum pump), reciprocating DVE vacuum pump and water jet pump.

Compared with the other two pumps, the water-ring DVE vacuum pump has the advantages of high pumping speed, wear resistance, and durability, but it also has disadvantages due to its own principle and structure. Mainly manifested in:
① The two-stage structure is more complicated and requires higher quality of maintenance personnel;
② The water ring pump is more sensitive to working environment conditions when in use.

The pumping speed and ultimate pressure of the water ring pump are closely related to the gap between the impeller, the suction and exhaust plate, and the intermediate suction and exhaust baffle. The gap is generally 0.3mm. During the use of the DVE vacuum pump, the gas is pumped Due to the large number of particles or local water quality, the gap changes due to wear or a large amount of scale adhesion between the three, which will cause the ultimate pressure and pumping speed of the DVE vacuum pump to drop, and the rotor locks up.

To avoid this kind of phenomenon, it is necessary to have a good vacuum filter, adjust the water quality appropriately, and strengthen the maintenance of the DVE vacuum pump.