Decrypt the way the Roots blower is sealed

The seal of the Roots blower consists of a seal of the main shaft shaft extension, the oil seal at the rear of the bearing housing and the bearing seal on the wall plate. The bearing seal of the wall panel is mainly to prevent other leaks. In addition to preventing oil leakage, the other two parts sometimes have the function of sealing gas. So, do you know what seals are available for Roots blowers? Here are the four sealing methods for the Roots blower.

Method 1: Labyrinth Seal

It is a non-contact dynamic seal that uses fluid to flow through a series of throttling gaps and expansion cavities to create a throttling effect on the working medium to limit leakage. The wall seal of the Roots blower is widely used with a labyrinth seal. The sealing mechanism can be simply explained as that the fluid passes through a plurality of tortuous passages, and a large amount of resistance is generated by a plurality of throttlings, so that the fluid is difficult to leak, thereby achieving the sealing purpose. This type of seal is generally suitable for use in the delivery of air and is limited in its use when transporting toxic, flammable and explosive gases. This type of seal is generally used for standard Roots blower wall panel seals.

Method 2: packing seal

It is a sealed form that fills the leak passage with a filler to prevent leakage. The packing sealing structure is simple, convenient to assemble and disassemble, and low in cost, and thus has been widely used. In the packing sealing structure of the Roots blower, the packing packing, the forming polytetrafluoroethylene packing and the skeleton oil seal packing are more commonly used. Since this type of seal is a contact type seal, it is easy to cause wear of the shaft (contact with the oil seal lip or the Teflon packing). Because of its simple structure, convenient assembly and disassembly, low cost, good sealing effect, and low requirements on working environment and maintenance, it has been widely used in industries such as fertilizer plants.

Method 3: Up ring seal

A plurality of slit elastic rings are placed in the sealing groove, and the outer circle is closely attached to the casing due to the elastic force of the ring itself, and the outer diameter of the ring is not rotated relative to the casing. The gas can only leak downstream through the gap between the rising ring and the annular groove. During operation, the rising circle is in close contact with the downstream end surface of the annular groove under the action of the gas pressure difference on both sides. The high-pressure gas entering the gap fills the backlash space, and the seal between the outer circle of the rising ring and the inner hole of the sealing seat is further strengthened, and the remaining leakage channel has only the slit of the rising circle. Since the gap between the slits is small and the specimens are misplaced during installation, after a few loops of sealing, there is very little going out. If a sealing gas seal is added, the sealing effect is better. Since this type of seal is a contact type seal, the sealing effect is good, but it requires grease lubrication when used. The newly developed special material is made of a ring that can be filled without grease.

Method 4: Mechanical seal

Also known as end face seal, it is a device that limits the leakage of working fluid along the shaft. It usually consists of a stationary ring (static ring), a rotating ring (moving ring), elastic or magnetic components, a rotating ring transmission and an auxiliary sealing ring. In operation, the sealing function is realized by the two engaging surfaces of the rotating ring and the stationary ring rotating relative to each other and the auxiliary sealing. Whether the mechanical seal can work normally depends on whether a stable and reliable lubricating liquid film can be established between the two end faces and the friction heat is released in time. Because mechanical seal has reliable operation, small leakage, long working life, automatic end face wear compensation, no need for frequent maintenance, low power loss, and no wear on the shaft, it is widely used in machinery industry, petroleum and chemical industries. In a class of rotating machinery.

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