A coaxial double blade gas isolation sealing device

Abstract

The invention discloses a coaxial double-blade gas isolation sealing device, which comprises a main shaft, a sealing wheel, a sealing cover and a housing, the sealing cover is arranged at the end of the housing, the main shaft passes through the sealing cover and is connected to an external rotary drive, and the main shaft is sleeved The sealing wheel, the sealing wheel is located in the sealing cover, the sealing wheel includes the wheel body, the outer ring blade and the inner ring blade, the outer ring blade and the inner ring blade are all arranged on the end face of the side of the wheel body facing the sealing cover, the outer ring blade and the inner ring blade The inner ring blades are distributed in a ring shape and centered on the main shaft. After the outer ring blades and inner ring blades are rotated by the main shaft, the outer ring blades pump air centrifugally, and the inner ring blades pump air centripetally. The contact surface between the wheel body and the main shaft Set the O-ring. The main shaft is arranged vertically. The sealing wheel also includes an isolation cavity and a liquid injection hole. The sealing cover also includes a protruding ring arranged on the end face facing the sealing wheel. The protruding ring is inserted into the isolation cavity, and the sealing liquid submerges the bottom of the protruding ring in a static state.

Description

technical field [0001] The invention relates to the field of gas sealing, in particular to a coaxial double-blade gas isolation sealing device. Background technique [0002] Sealing is required on many machines, such as stirring tanks that cannot touch the air medium or volatilized gases that cannot be discharged into the atmosphere in large quantities, or fans that blow some slightly harmful gases. [0003] These devices need to isolate the medium gas in the device from the external atmosphere, because it is a moving device, the work needs to use the rotating shaft, and the rotating power of the rotating shaft generally comes from a motor or transmission device outside the device, at the end of the machine It is bound to involve rotating and dynamic sealing, and a sealing ring is directly used to hold the main shaft. Because the dynamic and static parts are in contact, there will be relatively large friction, and the power loss can still be received. However, a large amount...

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Problems solved by technology

[0003] These devices need to isolate the medium gas in the device from the external atmosphere, because it is a moving device, and the work needs to use the rotating shaft, and the rotating power of the rotating shaft generally comes from a motor or transmission device outside the device, at the end of the machine It is bound to involve rotating and dynamic sealing, and a sealing ring is directly used to hold the main shaft. Because the dynamic and static parts are in contact, there will be relatively large friction, and the power loss can still be received, but the large amount of heat generated by friction cannot be dissipated in time, and local temperature The rise is very large, which not only affects the sealing gap, but also causes wear and tear, frequent maintenance, and some use liquid seals, let a rotating ring be inserted into an oil chamber, and keep in contact with the oil while rotating, so that the liquid is isolated from both sides Gas, but this method still has a large friction and calorific value, the oil needs to flow and add a heat exchanger, and the power loss on the spindle is also large, and the work efficiency is low

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