Shaft seal device of rotor pump

Abstract

Provided is a shaft seal device of a rotor pump. The shaft seal device comprises a mechanical seal base (3), a fixed ring (4), a moving ring base (5) and a moving ring (6) driven by the moving ring base (5). A first O-shaped ring (8) is arranged in a slit between the fixed ring (4) and the mechanical seal base (3). A tube body of the moving ring base (5) extends into the inner cavity of the mechanical seal base (3), an inner cavity (9) of the moving ring base, which is closed, is formed between the tube body of the moving ring base (5) and a shaft (1), a second O-shaped ring (11) is arranged in a slit between the moving ring (6) and the moving ring base (5). A compressive spring (12) is arranged between a connected end of the moving ring base (5) and the moving ring (6), and the moving ring (6) is in close contact with the fixed ring (4). A third O-shaped ring (30) is arranged between a connected end of the moving ring base (5) and the shaft (1). The moving ring base (5) is connected with an impeller (2) through at least one drive pin (13); one end of each drive pin (13) is in close-fit connection and the other end thereof is in floating insertion. By the shaft seal device of the rotor pump, performance of the rotor pump is improved and service life thereof is prolonged effectively. The shaft seal device is particularly applicable to shaft sealing of hygiene-grade rotor pumps.

Description

technical field [0001] The invention relates to a shaft sealing device of a rotor pump, in particular to a mechanical shaft sealing device of a sanitary rotor pump. Background technique [0002] Rotor pumps are also called colloid pumps, impeller pumps, universal delivery pumps, etc. Because their impellers are shaped like cams, they are also called cam pumps. Rotor pumps are positive displacement pumps; they are generally double rotors. The rotor pump achieves the purpose of conveying fluid materials by means of the periodic conversion of multiple fixed volume delivery units in the working chamber. Usually, a pair of synchronous gears are driven by a motor to drive the main and auxiliary shafts, and the double rotors are driven by the main and auxiliary shafts to rotate synchronously and in opposite directions, so that the volume of the pump changes, thereby forming a higher vacuum degree and discharge pressure; inlet It is a low-pressure area, and the outlet is a high-pre...

AI Technical Summary

Problems solved by technology

Due to the friction between the moving ring and the static ring when the rotor pump is working, the mechanical seals including the moving ring, the static ring and the O-ring are subject to heat and wear, resulting in a decline in performance. When there is obvious leakage of fluid materials, it needs to be shut down for maintenance.

Among the existing technical solutions, there is also a solution for lubricating the seal of the cooling machine by using the fluid material it transports. The mechanical seal is fixed in the axial direction. For example, the Chinese patent document CN201401323Y is a practical In the new public document, due to the high pressure of the fluid material entering and leaving the space where the machine seal is located, there is a greater extrusion force on the machine seal, and once too much accumulation does not circulate, it will continue to heat up, reducing the impact of the fluid material on the machine seal. The cooling effect of the components affects the shaft seal performance of the rotor pump and the service life of the shaft seal

[0004] In fact, the pressure of the fluid material that enters and exits the space where the mechanical seal is in contact with it changes. The inventors of this case have found after years of research that the mechanical seal in the prior art is designed to be fixed in the axial direction, which is precisely for the fluid material. The pressure change did not take appropriate countermeasures, which led to the change of fluid material pressure impact on the performance of the shaft seal and the service life of the shaft seal; then, how to overcome the impact of fluid material pressure impact on the shaft seal performance and shaft seal What about the greater impact on service life? In addition, how does the mechanical shaft seal device of the rotor pump provide sanitary protection for sanitary materials?

Images