Screw vacuum pump with built-in nitrogen seal at exhaust side

A screw vacuum pump, nitrogen sealing technology, applied in the sealing device of piston pump, pump, pump components, etc., can solve the problems of nitrogen consumption, nitrogen leakage, affecting the quality of raw gas, etc., to prolong the service life and protect from damage Effect

Pending Publication Date: 2019-02-15
JIANGSU ASIA PACIFIC IND PUMP TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the known screw vacuum pump nitrogen protection system, the nitrogen sealing interface is set at the front end of the mechanical seal and the double-lip sealing ring close to the pump chamber. Since the nitrogen always maintains a constant pressure, the pressure in the inner chamber of the screw vacuum pump is generally at Fluctuates between -0.08MPa~0.02MPa, which will cause a part of nitrogen to leak into the pump cavity and mix with the medium gas, which will not only consume nitrogen, but also affect the quality of raw gas

Method used

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  • Screw vacuum pump with built-in nitrogen seal at exhaust side
  • Screw vacuum pump with built-in nitrogen seal at exhaust side

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail:

[0014] Such as figure 1 , 2, the exhaust side built-in nitrogen-sealed screw vacuum pump, including pump body 1, front housing 2, rear housing 3, gear box 4, driving rotor 5, driven rotor 6, motor 7. The front casing 2 is installed on the intake side of the pump body 1 through the positioning flange 8, the rear casing 3 is installed on the exhaust side of the pump body 1 through the exhaust guide plate 9, and the exhaust guide plate 9 is positioned and connected to the Pump body 1 and rear casing 3. The driving rotor 5 and the driven rotor 6 are fixed and installed in the pump body 1 in parallel. One end of the driving and driven rotors 5 and 6 is supported on the front casing 2 by cylindrical roller bearings, and the other end is supported on the rear by double row angular contact ball bearings. shell3. The gear box 4 is fixedly connecte...

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Abstract

The invention relates to the field of screw vacuum pumps, and provides a screw vacuum pump with a built-in nitrogen seal at the exhaust side. In a nitrogen gas flow sealing chamber arranged between amechanical seal of a front shell and a double-lip sealing ring, nitrogen gas flow can always uphold a constant micro-positive pressure state, so that oil vapor in a gear box can be prevented from entering a pump chamber of the screw vacuum pump, corrosive media in the pump chamber of the screw vacuum pump can be prevented from entering the gear box to pollute lubricating oil, the mechanical seal and the double-lip sealing ring can be effectively protected from being damaged, and the service life of a sealing member can be prolonged.

Description

technical field [0001] The invention relates to a screw vacuum pump, in particular to a screw vacuum pump with a built-in nitrogen seal on the exhaust side. Background technique [0002] At present, in the known screw vacuum pump nitrogen protection system, the nitrogen sealing interface is set at the front end of the mechanical seal and the double-lip sealing ring close to the pump chamber. Since the nitrogen always maintains a constant pressure, the pressure in the inner chamber of the screw vacuum pump is generally at Fluctuating between -0.08MPa~0.02MPa, this will cause a part of nitrogen to leak into the pump cavity and mix with the medium gas, which will not only consume nitrogen, but also affect the quality of raw gas. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a screw vacuum pump with a built-in nitrogen seal on the exhaust side, which can not only protect the seal from m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C27/02F04C18/16F04C25/02F04C23/02
CPCF04C27/02F04C18/16F04C23/02F04C25/02
Inventor 薛建国王润泽刘琴
Owner JIANGSU ASIA PACIFIC IND PUMP TECH DEV CO LTD
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