Method for detecting the sealing performance of a piston
A technology of sealing performance and detection method, applied in the direction of liquid tightness measurement using liquid/vacuum degree, and detecting the appearance of fluid at the leakage point, etc., can solve problems such as inability to judge, and achieve the effect of simple operation
Inactive Publication Date: 2021-05-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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Problems solved by technology
As described in the invention patent (publication number CN103364145A), a sealing performance detection method, if the sealed container is provided with seals in multiple places, even if the concentration of water vapor inside the sealed cavity changes, it can only be determined whether the sealed cavity leaks. However, whether it is caused by the sealing performance of the target seal will not be able to judge
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Embodiment
[0037] Embodiment A kind of piston sealing performance detection method, comprises the following steps:
[0038] a Mix the alkaline sealed medium—sodium carbonate aqueous solution—with the pH detection reagent—phenolphthalein, and record the color change rule of the phenolphthalein reagent after adding sodium carbonate aqueous solution: before adding sodium carbonate aqueous solution , The phenolphthalein reagent is in a colorless and transparent state. After the sodium carbonate aqueous solution is added to the phenolphthalein reagent, the phenolphthalein reagent changes from colorless and transparent to red. The greater the amount of sodium carbonate aqueous solution added, the redder the phenolphthalein reagent.
[0039] b inject the sodium carbonate aqueous solution through the first switch valve 4 and fill the left cavity of the piston 12 in the cylinder 5 in the piston sealing system, then close the first switch valve 4, and the first seal 2 ensures that the cylinder 5 an...
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The invention relates to a method for detecting the sealing performance of a piston, which comprises the following steps of: a, testing the color change of a sealed medium and a used pH value detection reagent in advance, and performing recording the data for later use; b, injecting a sealed medium into a left cavity of a piston in a barrel in the piston sealing system, closing a first switch valve, and guaranteeing that the cavity is strictly sealed; c, injecting a pH detection reagent into a right cavity of a piston of the barrel, and guaranteeing that the liquid level of the reagent submerges all sealing faces; d, applying external force to drive a piston to extrude the sealed medium, observing the cavity pressure of the sealed medium through a pressure gauge, and maintaining the pressure until the required pressure grade is reached; and e, sealing performance detection: observing the pH value, detecting the color change of the reagent, directly judging whether leakage occurs at the piston sealing element or not, and if leakage occurs, determining the specific position where leakage occurs firstly. The pH value characteristic of the sealed medium is utilized, operation is easy, and visual and accurate judgment can be achieved.
Description
technical field [0001] The invention relates to the technical field of sealing performance detection, in particular to a method for detecting the sealing performance of a piston. Background technique [0002] The piston sealing system consists of a piston, a seal, a cylinder, and end covers on both sides. The piston and the seal are used to isolate the liquid medium on both sides. It is often used for special fuel medium storage or pushing tasks. The piston and seal are relatively The cylinder may be static or reciprocating, but all need to ensure strict sealing. The special fuel medium often has the characteristics of strong corrosiveness, strong acidity and alkalinity, which will cause the performance of the seal to decrease or fail, resulting in fuel leakage, equipment failure to operate normally, environmental pollution, and even fire and explosion hazards. Therefore, the piston The sealing performance test of the sealing system is very important. [0003] At present, ...
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IPC IPC(8): G01M3/04
CPCG01M3/04
Inventor 刘文广王宏刚高贵陈生圣赵更锐任俊芳马小录冯要飞
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI