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End face structure of mechanical seal of nested spiral groove

A mechanical seal and spiral groove technology, which is applied to engine seals, mechanical equipment, engine components, etc., can solve the problems of small opening force of the seal end face, inability to form a stable fluid film, and low rigidity of the fluid film.

Inactive Publication Date: 2020-06-16
NANJING POLYTECHNIC INSITUTE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that under the condition of low pressure and low speed, the opening force of the end face of the typical hydrodynamic mechanical seal is small, the rigidity of the fluid film is low, and the problem that a stable fluid film cannot be formed on the seal end face

Method used

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  • End face structure of mechanical seal of nested spiral groove
  • End face structure of mechanical seal of nested spiral groove

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Embodiment Construction

[0015] The nested spiral grooves are processed by a lamp-pumped YAG-T50 series laser marking machine produced by Shenzhen Han’s Laser Technology Co., Ltd. The pump source is a krypton lamp, and a 380V three-phase four-wire external power supply is used. The power of the whole machine is 5KW, the wavelength of the laser emitted by the system is 1064nm, the laser power is ≤50W, the laser repetition rate is ≤50KHz, the beam quality is M 2 <10.

[0016] The upper groove 1, the middle groove 2 and the lower groove 3 are sequentially etched by laser on the end face of the moving ring or the static ring of the mechanical seal. Grooving process parameters are: for cemented carbide, the effective vector step is 0.001mm, the delay between effective vector steps is 60μs, the Q frequency is 20KHz, and the laser current is 16A; for silicon carbide, the effective vector step is 0.001mm, The delay between effective vector steps is 60μs, the Q frequency is 20KHz, and the laser current is 17A...

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Abstract

The invention provides an end face structure of a mechanical seal of a nested spiral groove. On the end face of a moving ring or a stationary ring of the mechanical seal, the nested spiral groove is etched by laser, and a sealing medium flows through a lower groove 3, a middle groove 2 and an upper groove 1 in sequence. After the equipment rotates, the medium enters the nested spiral groove underthe action of pump suction of the spiral groove. Because of the obstruction of seal weirs of each groove, the medium pressure increases step by step, and the dynamic pressure effect of a fluid film isimproved, so that the fluid film with high rigidity is formed on the seal end face, and stable non-contact operation is realized. Moreover, because of the sequential throttling of a three-layer sealdam, the medium leakage rate is further reduced. The end face structure of the mechanical seal of the nested spiral groove is suitable for the mechanical seal under low pressure and low speed operation conditions.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, in particular to a nested spiral groove mechanical seal end face structure, which is suitable for shaft end seals of low-pressure and low-speed rotating equipment. Background technique [0002] The non-contact mechanical seal has advanced performance, low friction power consumption, almost no wear under normal conditions, long life and high reliability, and is suitable for extreme and harsh working conditions. At present, non-contact mechanical seals are being promoted to the shaft end seals of low-pressure and low-speed rotating equipment, such as shaft end seals of centrifugal pumps, reactors and other equipment. Domestic patent 201710472773 .3 announced a low-leakage spiral groove liquid film mechanical seal end face structure, which solved the problems of difficult non-contact stable operation and poor start-stop performance of mechanical seals under low pressure conditions; 20161060...

Claims

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Application Information

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IPC IPC(8): F16J15/40
CPCF16J15/40
Inventor 张鹏高张蕾魏龙冯秀金良
Owner NANJING POLYTECHNIC INSITUTE