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Symmetrical low-temperature-resistant combined type sealing device

A sealing device and low-temperature-resistant technology, which is applied to the sealing of engines, engine components, mechanical equipment, etc., can solve problems such as poor repeatability, limited sealing and reliability, and poor environmental adaptability, achieving compact structure and high reliability , the effect of compact sealing structure

Pending Publication Date: 2021-07-16
XIAN AEROSPACE PROPULSION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of using end face seal in the existing dynamic sealing structure, which has limited sealing performance and reliability, poor environmental adaptability and poor repeatability, and provides a symmetrical low temperature resistant combined sealing device

Method used

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  • Symmetrical low-temperature-resistant combined type sealing device
  • Symmetrical low-temperature-resistant combined type sealing device
  • Symmetrical low-temperature-resistant combined type sealing device

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] A symmetrical low temperature resistant combined sealing device, such as Figures 1 to 4 As shown, it includes a pump housing 9, a rotating shaft 8 inserted into the pump housing 9, a sleeve 7 sleeved on the rotating shaft 8, a sealing assembly and two positioning keys 6; the rotating shaft 8 is provided with Two first key grooves are respectively located at both ends of the shaft sleeve 7, and two positioning keys 6 are respectively arranged in the two first key grooves; the inner wall of the pump casing 9 is provided with a first boss c along the circumference, and the first boss The platform c is provided with a second boss b in the circumferential direction; the second boss b is provided with a second discharge passage 11 (blow-off discharge passage), and the first boss c is provided with two first discharge passages 10 , the two first disch...

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Abstract

The invention relates to combined type sealing devices, in particular to a symmetrical low-temperature-resistant combined type sealing device. The invention aims to solve the technical problems of limited sealing performance and reliability, poor environmental adaptability and poor repeatability due to the adoption of end face sealing in an existing dynamic sealing structure. According to the symmetrical low-temperature-resistant combined type sealing device, the end face seal of a liquid seal wheel, the inner end face of the liquid seal wheel and a static ring seal assembly and the floating ring seal are connected in series, the end face seal of the liquid seal wheel and the static ring seal assembly serve as the main seal, the floating ring seal serves as the auxiliary seal, trace leakage media can be discharged through each leakage channel, and the device has the advantages of being compact in sealing structure, high in sealing capacity, high in reliability, large in environment temperature tolerance range, capable of tolerating the low temperature of liquid oxygen, good in repeatability and suitable for high-pressure working environments.

Description

technical field [0001] The invention relates to a combined sealing device, in particular to a symmetrical low-temperature resistant combined sealing device, which can be used in the fields of liquid rocket engine turbo pump, ship, nuclear industry, etc. in the rotating device. Background technique [0002] Dynamic sealing devices are often used in the fields of liquid rocket engine turbopumps, ships, nuclear industry, and other fields that must ensure sealing and small size and space in rotating devices. For example, the liquid oxygen kerosene engine in the liquid rocket engine turbo pump uses low-temperature liquid oxygen and normal temperature kerosene as propellants, which have the characteristics of wide temperature range, easy gasification of the medium, and strong oxidation. In order to prevent the liquid oxygen medium from meeting with the kerosene medium and cause fire, a combined dynamic sealing device is installed between the liquid oxygen pump and the kerosene pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/16F16J15/18F16J15/20F16J15/40
CPCF16J15/16F16J15/184F16J15/20F16J15/40
Inventor 李正大周芮常涛宋勇张玻溶闫方琦李志宇
Owner XIAN AEROSPACE PROPULSION INST
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