Tandem type mechanical seal for high-temperature high-pressure multistage pump

A mechanical seal, high temperature and high pressure technology, applied in the direction of mechanical equipment, pumps, pump components, etc., can solve the problems of fluid leakage, etc., and achieve the effect of improving sealing ability and preventing leakage

Inactive Publication Date: 2018-02-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the fluid pressure inside the machine is set to be the highest, in the case of using the fluid inside the machine as the seal liquid, the fluid inside the machine is prone to leak, so the leaked fluid inside the machine must be recovered

Method used

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  • Tandem type mechanical seal for high-temperature high-pressure multistage pump
  • Tandem type mechanical seal for high-temperature high-pressure multistage pump

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Experimental program
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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0028] figure 1 It shows an embodiment of a tandem seal structure suitable for high-temperature and high-pressure multi-stage pumps of the present invention, a tandem mechanical seal for high-temperature and high-pressure multi-stage pumps, including a first-stage seal assembly 20, a second-stage seal assembly 30 and the third seal assembly 40; the first seal housing 12, the second seal housing 13 and the third seal housing 14 are connected to the pump body 10 by bolts and nuts, the pump shaft 11 passes through the seal housing, and the pump A shaft sleeve 15 is fixed on the shaft 11, and the first-stage seal assembly 20, the second-stage seal assembly 30 and the third-stage seal assembly 40 are sequentially installed between the shaft sleeve 15 and the sealing housing; t...

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PUM

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Abstract

The invention provides a tandem type mechanical seal for a high-temperature high-pressure multistage pump. The tandem type mechanical seal comprises a primary sealing assembly, a secondary sealing assembly and a tertiary sealing assembly, wherein the primary sealing assembly and the tertiary sealing assembly are of contact type mechanical sealing structures; the secondary sealing assembly comprises a second movable ring and a second fixed ring; the second movable ring is mounted on a pump shaft; the second fixed ring is mounted on a sealing housing; a second spring is axially arranged betweenthe non-sealing surface of the second fixed ring and the sealing housing; the second spring presses the second fixed ring and the second movable ring; a groove which is distributed in the radial direction is formed in the sealing ring of the second movable ring; and the groove communicates with a first ring-shaped space. Three groups of mechanical seals are adopted, wherein contact type mechanicalseals are adopted at the two sides and non-contact type mechanical seal is adopted in the middle, so that the service life is prolonged and leakage loss is reduced.

Description

technical field [0001] The invention relates to the field of multistage pump seals, in particular to a serial mechanical seal for high temperature and high pressure multistage pumps. Background technique [0002] With the rapid development of domestic industry, the demand for electric power increases, so it is necessary to continuously design and build large-capacity thermal power units to meet the needs of the country's rapid development. Supercritical units have the advantages of high efficiency, low unit investment, short construction period, and low emissions of sulfur and nitrogen oxides, carbon dioxide and other greenhouse gases. Therefore, supercritical units will be widely used in new thermal power units in the future. At present, the operating temperature and pressure ranges of boiler feed water pumps used in domestic supercritical units are about 150-200°C and 10-20MPa respectively. Therefore, under such high temperature and pressure, higher requirements are put ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/10F04D29/12F04D29/58
CPCF04D29/106F04D29/126F04D29/586
Inventor 付强刘刚朱荣生李梦圆
Owner JIANGSU UNIV
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