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Shaft sealing device of oil-free screw machine

An oil screw and shaft seal technology, applied in the field of shaft seal devices, can solve problems such as serious steam conditions, and achieve the effect of preventing water vapor from contacting the bearing

Pending Publication Date: 2018-02-02
SHANGHAI QIYAO SCREW MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing shaft seal device can not completely solve the leakage problem of sealing oil and sealing gas, but can only reduce the leakage of sealing oil of mechanical seal and sealing gas of dry gas seal as much as possible. Steam pollution always exists, and the steam condition of closed cycle is even more serious

Method used

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  • Shaft sealing device of oil-free screw machine

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings.

[0011] Please refer to figure 1 . The shaft seal device of an oil-free screw machine according to an embodiment of the present invention includes a front seal 1, a main seal 2, an isolation air seal 3 and a bearing (not shown in the figure) installed on the rotor 9 of the oil-free screw machine.

[0012] The main seal 2 is located between the front seal 1 and the bearing; the isolation air seal 3 is located between the main seal 2 and the bearing. exist figure 1 In the example shown above, both the front seal 1 and the isolation gas seal 3 are carbon ring seals, the front seal 1 is equipped with three carbon rings 10, the isolation gas seal 3 is equipped with two carbon rings 30, and the main seal 2 is double-ended Machinery Seal. In other embodiments, the pre-sealing 1 may also adopt a comb-tooth seal, and the isolation air seal 3 may adopt a comb-tooth seal or a ...

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Abstract

Disclosed is a shaft sealing device of an oil-free screw machine. The shaft sealing device comprises a front sealing, a main sealing, an isolating air sealing and a bearing which are installed on a rotor of the oil-free screw machine. The main sealing is located between the front sealing and the bearing. The isolating air sealing is located between the main sealing and the bearing. The main sealing is a double-end-surface mechanical sealing. A water injecting hole and a backwater hole which penetrate through the side wall of a shell body are formed in the corresponding positions of the shell body of the oil-free screw machine and the double-end-surface mechanical sealing. Isolating air inlet holes penetrating through the side wall of the shell body are formed in the corresponding positionsof the shell body of the oil-free screw machine and the isolating air sealing. An isolating air guiding-in hole penetrating through the side wall of the isolating air sealing is formed in the side wall of the isolating air sealing. Isolating air injected into the isolating air inlet hole can enter the isolating air guiding-in hole. A sewage discharging hole penetrating through the side wall of the shell body is formed in the shell body of the oil-free screw machine between mechanical sealing and the isolating air sealing. The shaft sealing device cannot pollute working medium steam in a working cavity of the screw machine and cannot affect the service life of the rotor bearing.

Description

technical field [0001] The invention relates to a shaft sealing device of an oil-free screw machine. Background technique [0002] The shaft seal device is used to effectively isolate the bearing lubricating oil system from the working chamber, and is an important part of the oil-free screw machine. The shaft seal device of the existing oil-free screw machine is usually composed of a front seal and a main seal. The front seal generally adopts a labyrinth seal or a carbon ring seal. Dry gas seal for sealing media. Leakage, high pressure and high temperature are common problems faced by current oil-free screw machines. The existing shaft seal device can not completely solve the leakage problem of sealing oil and sealing gas, but can only reduce the leakage of sealing oil of mechanical seal and sealing gas of dry gas seal as much as possible. Steam pollution always exists, and the steam condition of closed cycle is even more serious. Contents of the invention [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C27/00F04C27/02F04C29/04F01C19/12F01C21/06
CPCF01C19/125F01C21/06F04C27/009F04C27/02F04C29/042
Inventor 姚同林马建元刘常峰蒋俊彦谢楷
Owner SHANGHAI QIYAO SCREW MACHINERY
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