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Cavity product airtightness detection table and detection method

A sealing detection and product technology, which can be used in the testing of fluid sealing, using liquid/vacuum for liquid tightness measurement, and by detecting the appearance of fluid at the leak point, which can solve the problems of low detection accuracy and poor reliability. , to achieve high detection accuracy, meet the requirements of sealing detection, and improve the efficiency of sealing detection

Active Publication Date: 2016-08-24
MIANYANG FULIN PRECISION MACHINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low detection accuracy of the differential pressure air tightness detector, which generally can only reach 0.1 sccm, the reliability of the airtightness test results is poor, especially the traces of cavity products cannot be effectively identified. external leak

Method used

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  • Cavity product airtightness detection table and detection method
  • Cavity product airtightness detection table and detection method
  • Cavity product airtightness detection table and detection method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] Such as figure 1 The chamber type product airtightness detection platform shown mainly includes a helium gas source 1, a helium mass spectrometer leak detector 14 and a sealing device, wherein the helium gas source 1 adopts a helium tank, and the specific structure of the sealing device Such as Figure 4 As shown, it mainly includes an indenter 10, a base 18 and a bell jar 19. The indenter 10 is a hollow cylinder with a T-shaped structure, and its relatively small end is inserted into the inner cavity of the bell jar 19. The bell jars 19 are sealed and fixed, and the base 18 and the bell jars 19 are movably connected, and the two can be separated from each other, or the bell jars 19 can go down relative to the base 18 until they are combined. Form a sealed connection. In order to more conveniently control the upward and downward movement of the bell 19 relative to the base 18 and save manpower, the cylinder 6 can be used to control the up and down movement of the bell...

Embodiment approach 2

[0036] Such as figure 2 The shown cavity-type product airtightness testing platform also includes an alarm 7, a display 8 and a controller 9, a first pressure sensor 3 is set on the air intake duct 4, and a second pressure sensor 16 is set on the air suction duct 17 , the cylinder 6 uses a solenoid valve 27 to control its action. Wherein, the alarm 7 can be a photoelectric alarm, such as a three-color alarm lamp, or an audible alarm; the controller 9 can be a PLC, or a single-chip microcomputer, or an industrial computer. Such as image 3 As shown, the first pipeline valve 2, the second pipeline valve 13, and the third pipeline valve 15 all adopt electromagnetic valves, and are electrically connected with the controller 9 respectively; the display 8, the helium mass spectrometer leak detector 14, the vacuum pump 12. The alarm 7, the first pressure sensor 3, the second pressure sensor 16, and the solenoid valve 27 are electrically connected to the controller 9, respectively....

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Abstract

The invention provides a cavity product airtightness detection table and a detection method. The cavity product airtightness detection table comprises a helium source, a helium mass spectrometer leak detector and a sealing device, wherein a hollow cavity for mounting a to-be-detected product is formed in the sealing device; the hollow cavity is divided by the to-be-detected product into a first sealing cavity and a second sealing cavity independent of each other; the first sealing cavity is communicated with an inner cavity of the to-be-detected product; the to-be-detected product is positioned in the second sealing cavity; the helium source is communicated with the first sealing cavity through an intake duct; and the helium mass spectrometer leak detector is communicated with the second sealing cavity through an exhaust duct. In the invention, the helium is introduced into the first sealing cavity through the helium source; and based on the characteristics of small molecular weight and excellent penetrability of the helium, the gas in the second sealing cavity is subjected to exhaust detection by the helium mass spectrometer leak detector to obtain a leakage rate detection result of the to-be-detected product, the airtightness detection accuracy is high, and the detection result is accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of airtightness detection of cavity-type products, in particular to a detection platform and a detection method for the airtightness of cavity-type products. Background technique [0002] For cavity products, especially those with high sealing requirements, for example, the belt-type phaser used in automobile engines, the working cavity and the outside are sealed with rubber sealing rings. When working, the oil in the inner cavity is subjected to complex forces. The sealing ring of the phaser not only bears the high oil pressure in the inner cavity, but also bears the centrifugal force generated by the oil in the inner cavity when the phaser rotates. Therefore, the sealing performance of the phaser is a measure of the belt type. An important technical indicator of the pros and cons of a phaser. When the belt-type phaser leaks oil (commonly known as "external leakage"), it is easy to cause the belt to slip b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/20
CPCG01M3/202
Inventor 蒋东尹茂田刘锐马匀厅王艳
Owner MIANYANG FULIN PRECISION MACHINING
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