Method for measuring leakage rate of sealing piece
A seal and leakage rate technology, applied in the field of functional testing, can solve problems such as inability to accurately simulate the working conditions of aircraft seals, difficulty in meeting high-precision test requirements, and difficulty in obtaining accurate data, so as to eliminate unreliable measured values, Ensure the measurement of the seal leakage rate and ensure the effect of the measurement
Active Publication Date: 2018-10-16
COMAC +1
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Problems solved by technology
[0003] The traditional measurement method is to simulate a closed cavity and test the leakage of the actual seal by introducing a flowmeter. However, because the flow rate is small, it is difficult to obtain accurate data simply by measuring with a meter, and it can only be averaged over a long period of time. It is difficult to meet the high-precision test requirements
[0004] In addition, the pressure outside the cabin at high altitude is less than one standard atmospheric pressure, and the single-chamber measurement of the leakage rate itself cannot accurately simulate the working conditions of the aircraft seals in real conditions
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[0040] Specific implementations of the present invention will be described below. It should be noted that in the process of specific descriptions of these implementations, for the sake of concise description, it is impossible for this specification to describe all the features of the actual implementations in detail. It should be understood that, in the actual implementation process of any embodiment, just like in the process of any engineering project or design project, in order to achieve the developer's specific goals and to meet system-related or business-related constraints, Often a variety of specific decisions are made, and this can vary from one implementation to another. In addition, it will be appreciated that while such development efforts may be complex and lengthy, the technology disclosed in this disclosure will be Some design, manufacturing or production changes based on the content are just conventional technical means, and should not be interpreted as insuffic...
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The invention relates to a method for measuring the leakage rate of a sealing piece. The method includes the steps of loading the sealing piece into a dual-cavity measurement device including a firstcavity and a second cavity, wherein the first cavity is separated from the second cavity by the sealing piece; conducting pressurization on the first cavity or conducting pressure reduction on the second cavity to make the air pressure in the first cavity higher than that in the second cavity; measuring the air pressure pA0 of the first cavity and the air pressure pB0 of the second cavity at the first moment, and measuring the air pressure pA1 of the first cavity and the air pressure pB1 of the second cavity at the second moment; substituting the pA0, pA1, pB0 and pB1 into a formula PA and a formula PB separately to obtain the leakage rate of the sealing piece through calculation, wherein the leakage rate of the sealing piece is represented by a permeability coefficient K and an inertia permeability coefficient beta, the formulas PA and PB are shown in the description, M refers to the molar mass of gas, L refers to the stroke of the gas, R refers to a gas constant, T refers to gas temperature, Mu refers to a dynamic viscosity coefficient of the gas, and mq refers to the mass flow rate of the gas. The method has the technical advantage that high-precision measurement of the leakagerate of the sealing piece can be achieved.
Description
technical field [0001] The invention relates to the technical field of functional testing, in particular to a method for measuring the leakage rate of a seal. Background technique [0002] Modern aircraft cabins are usually pressurized, and the airtight performance of the cabin door in the pressurized area directly affects the safety of passengers and crew members. Especially in the field of aerospace, the working environment of the seals is harsh, so it poses a challenge to the leakage performance of the seals. Therefore, it is necessary to study its airtight performance at different compression ratios (working conditions). [0003] The traditional measurement method is to simulate a closed cavity and test the leakage of the actual seal by introducing a flowmeter. However, because the flow rate is small, it is difficult to obtain accurate data simply by measuring with a meter, and it can only be averaged over a long period of time. The approximate value obtained by this me...
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IPC IPC(8): G01M3/26
CPCG01M3/26
Inventor 严立浩渠涛刘若斯马大卫卢燚钧
Owner COMAC