Outside pressurized type dynamic and static pressure gas lubricating and sealing device

Abstract

The invention discloses an outside pressurized type dynamic and static pressure gas lubricating and sealing device, which comprises a moving ring (5) and a seal static ring (11), wherein the moving ring (5) is fixed on a moving ring seat (1) and rotates along with a spindle, and the seal static ring (11) is fixed on a seal cavity (2) and a seal end cover (12); channels (9) for introducing outsidepressurized gas from outside are arranged in the seal static ring (11), and the channels (9) of certain numbers are distributed in the seal static ring (11) along circumference; throttle devices (8) are arranged in the channels (9), and pressure equalizing troughs (7) of certain depth are arranged at the outlets of the channels (9); various dynamic pressure troughs (6) having dynamic pressure effects are formed on the end face of the moving ring (5) or the seal static ring (11), and the inside and outside of the pressure equalizing troughs (7) are provided with seal dams not communicated withthe pressure equalizing troughs; and on-line monitoring is realized by adjusting the pressure of the outside pressurized gas. The pressurized type dynamic and static pressure gas lubricating and sealing device greatly lowers resistance moment and power consumption and improves the phenomenon that the traditional end face seal abrasion is severe.

Description

technical field

[0001] The invention relates to an externally pressurized dynamic and static pressure gas lubrication and sealing device, which is suitable for the shaft end sealing of the sealing gas (or liquid) of rotary fluid machines such as stirring tanks, compressors, centrifugal pumps, etc., and can be used in chemical industry, food , medicine, aerospace, aviation and other industries. The applicable speed range is very large, not only for tens of thousands of revolutions per minute, but also for small or near-stationary situations, and can be used for bidirectional operation. Its applicable pressure range is large, and it is also suitable for occasions with pressure fluctuations. Suitable for various working conditions of high and low temperature. Background technique

[0002] For a long time, the sealing device has been considered as the biggest difficulty of rotary fluid machinery and the main cause of its failure. This has led to extensive research on rotary s...

Examples

Embodiment Construction

[0028] The content of the present invention will be further described in detail below in conjunction with the specific implementation manners shown in the accompanying drawings.

[0029] see figure 1 , figure 2 As shown, the way to introduce the external pressurized gas between the sealing end faces can be figure 1 As shown, the stationary sealing ring cannot be axially compensated, and is introduced into the sealing end face through the annular space formed by the sealing cavity 2 , the outer diameter of the stationary sealing ring 11 and the two O-rings 10 when it is stationary. When the static ring has axial compensation capability, that is, the spring 3 is stationary and does not rotate, it can be introduced between the sealing end faces through a flexible pipe 15 or a spiral ring tube, such as figure 2 shown.

[0030] A throttling device, such as a small hole throttling, is arranged on the fluid passage introducing the externally pressurized gas in the static ring. ...

technical field

[0001] The invention relates to an externally pressurized dynamic and static pressure gas lubrication and sealing device, which is suitable for the shaft end sealing of the sealing gas (or liquid) of rotary fluid machines such as stirring tanks, compressors, centrifugal pumps, etc., and can be used in chemical industry, food , medicine, aerospace, aviation and other industries. The applicable speed range is very large, not only for tens of thousands of revolutions per minute, but also for small or near-stationary situations, and can be used for bidirectional operation. Its applicable pressure range is large, and it is also suitable for occasions with pressure fluctuations. Suitable for various working conditions of high and low temperature. Background technique

[0002] For a long time, the sealing device has been considered as the biggest difficulty of rotary fluid machinery and the main cause of its failure. This has led to extensive research on rotary s...

Examples

Embodiment Construction

[0028] The content of the present invention will be further described in detail below in conjunction with the specific implementation manners shown in the accompanying drawings.

[0029] see figure 1 , figure 2 As shown, the way to introduce the external pressurized gas between the sealing end faces can be figure 1 As shown, the stationary sealing ring cannot be axially compensated, and is introduced into the sealing end face through the annular space formed by the sealing cavity 2 , the outer diameter of the stationary sealing ring 11 and the two O-rings 10 when it is stationary. When the static ring has axial compensation capability, that is, the spring 3 is stationary and does not rotate, it can be introduced between the sealing end faces through a flexible pipe 15 or a spiral ring tube, such as figure 2 shown.

[0030] A throttling device, such as a small hole throttling, is arranged on the fluid passage introducing the externally pressurized gas in the static ring. ...

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