Three-pivot seal testing device

A technology of sealing test and three fulcrums, which is applied in fluid tightness testing, measuring devices, engine sealing, etc., can solve problems such as poor rigidity of the spindle, high noise, and poor applicability, and achieve a wide range of axial and radial dimensions, Low vibration and noise, small footprint

Inactive Publication Date: 2002-06-19
JOHN CRANE TECH TIANJIN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Among the currently known seal test devices, one is a two-pivot type or simply supported beam type seal test device, and the test seal is placed between two sets of bearings. Although it has the characteristics of small fulcrum span and strong rigidity, it is The shaft diameter in the device has poor applicability to different product specifications, the test seal is complicated to disassemble and assemble, and the test cost is high
The other is a single cantilever type sealing test device, which has the advantages of compact structure, convenient disassembly and assembly, strong adaptability and low test cost, but its disadvantages outweigh its advantages. The main shaft of the sealing test has poor rigidity and low critical speed, so it is not suitable for large Shaft seal for high speed test
In addition, there is another kind of CNZL88214684 "test bench for sealing device for rotating shaft" published on February 21, 1990. It adopts a double cantilever or four fulcrum structure. Due to the use of special gear transmission, the overall volume is huge and the structure is complicated. Large, occupy a large test site, and the noise is loud, the test environment is harsh

Method used

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Examples

Experimental program
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Embodiment 1

[0017] Example 1: Please refer to figure 1 , the housing 2 of the variable frequency speed regulating motor 5 is installed on the base 1, and a set of bearings 3, 7 are respectively installed at both ends of the base 1 through the fixed bearing seats 4, 6, and the two sets of bearings 3, 7 are used to support the variable frequency speed regulating motor 5 The motor shaft 501, the extended end of the motor shaft 501 is equipped with a coupling 8, and the end of the motor shaft 501 is connected with the seal test main shaft 12 through the coupling 8, and the seal test main shaft 12 is installed in the housing 11 and faces to the left The side protrudes from the housing 11, and the sealed chamber 15 to be tested and the seal to be tested 16 are installed on the left side of the housing 11. The above-mentioned sealing test main shaft 12 has a three-support structure, that is, it is supported by two sets of bearings 9, 14 installed in the casing 11 and a set of bearings 17 install...

Embodiment 2

[0018] Example 2: Please refer to figure 2 , the part 2101 of the motor shaft 21 of the variable frequency speed regulating motor 20 protruding to the left is the main shaft of the sealing test. Three groups of bearings 28, 27, 26 are supported, and the sealed cavity 24 and one group of tested seals 23 are installed between the easy-to-disassemble bearing seat 25 and the front fixed bearing seat 22; The distance B between the bearings is in the range of 100-350 mm. In this figure, the number of bearings in the three bearing groups is 2, 2 and 2 from left to right, but the present invention is not limited to this arrangement, and the number of bearings in each group is 1 to 4 . Different from Embodiment 1, in this embodiment, the seal test spindle and the motor shaft are not independent of each other, but are the same shaft, and the part of the motor shaft extending to the left side is the seal test spindle. However, in these two embodiments, the essential features of the p...

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Abstract

The present invention relates to a three-fulcrum type seal test device, on the seal test main shaft a three-fulcrum type structure is placed for supporting said shaft. The described three-fulcrum type structure is characterized by that three groups of bearings which are mutually spaced at a certain distance are mounted on the seal test main sahft, in which two groups of bearings are respectively mounted into two fixed bearing seats; another group of bearing of mounted in a removable bearing seat, between the removable beairng seat and its adjacent fixed bearing seat, the tested seal cavity and tested seal are mounted. Said invention possesses the folloiwng advantages: good rigidity of test seal main shaft, high critical rotating speed, and said device is suitable for testing various gas seals.

Description

technical field [0001] The invention belongs to a sealing test device, in particular to a three-point type sealing test device for performing high-speed tests on various seals, especially gas-lubricated end face seals, that is, dry gas seals. Background technique [0002] Among the currently known seal test devices, one is a two-pivot type or simply supported beam type seal test device, and the test seal is placed between two sets of bearings. Although it has the characteristics of small fulcrum span and strong rigidity, it is The shaft diameter in the device has poor applicability to different specifications of the product, the disassembly and assembly of the tested seal is complicated, and the test cost is high. The other is a single cantilever type sealing test device, which has the advantages of compact structure, convenient disassembly and assembly, strong adaptability and low test cost, but its disadvantages outweigh its advantages. The main shaft of the sealing test h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/16G01M3/00
Inventor 王玉明
Owner JOHN CRANE TECH TIANJIN
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