CN106768688A - Leakage of seal chamber detection method based on Self-expanding gas - Google Patents
Leakage of seal chamber detection method based on Self-expanding gas Download PDFInfo
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- CN106768688A CN106768688A CN201611019824.9A CN201611019824A CN106768688A CN 106768688 A CN106768688 A CN 106768688A CN 201611019824 A CN201611019824 A CN 201611019824A CN 106768688 A CN106768688 A CN 106768688A
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- gas
- alcohol
- seal cavity
- leakage
- seal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
Abstract
The present invention provides a kind of leakage of seal chamber detection method based on Self-expanding gas, belongs to leak detection technology field.The method is specially：Before seal cavity assembling, volatile solid matter is used as reagent under placement heat can produce expanding gas or normal temperature inside it.Then refill and prepare to form seal cavity, the appropriate heating-up temperature of seal cavity (can be without heating for using volatile reagent under normal temperature) is given during leak detection, bubbing in solid reagent, because the micro-pressure that gas is produced is poor, has the trend of outside spilling.When seal cavity has leakage problem, this gas just can be detected outside seal cavity.Leakage of seal chamber detection is carried out using the method, the leak detection to compact conformation or any baroque seal cavity can be effectively realized.
Description
Technical field
The present invention relates to a kind of leak testing method, and in particular to a kind of leak detection side based on Self-expanding gas
Method, belongs to leak detection technology field.
Background technology
In order to ensure sealing effectiveness in important industrial production, often seal request, rule are proposed in the place of some compact conformations
Surely leak-testing must be carried out.Such as with the continuous improvement of aircraft tactics index, it is desirable to flying speed faster, range it is farther,
Aircraft is high with engine integration design degree.In order to improve range, effective method is to increase volume of fuel tank, fuel tank space
Increase causes engine space to reduce, and chamber length shortens, and topology layout is compacter.This class formation is often due to structure and sky
Between limit, conventional leak detection sensor and instrument deeply internal cannot be tested；And because inflation, topping up etc. are difficult to,
The traditional detection methods such as leak detection by bubbles, pressure differential method, audition method are made effectively to carry out.
The content of the invention
In view of this, the present invention provides a kind of leakage of seal chamber detection method based on Self-expanding gas, the method
Accessibility is good, easy and effective, can realize the leak detection to labyrinth closing space, and without complicated test equipment.
The described leakage of seal chamber detection method based on Self-expanding gas, specially：Seal cavity assembling is completed
Before, test agent is placed inside it；The test agent can produce volatile solid-state under expanding gas or normal temperature for heat
Material；During leak detection, the gas componant with the presence of test agent is detected whether outside seal cavity, annular seal space is shown if having
There is leakage in body, otherwise shows that seal cavity is not leaked.
For expanding gas can be produced as the seal cavity of test agent using heat, before leak detection, first will sealing
Cavity is heated to the temperature needed for test agent expansion produces gas.
In the presence of the gas componant for detecting test agent outside seal cavity, the test agent detected by
The concentration of gas componant judges leakage of seal chamber degree.
Used as a kind of preferred embodiment of the invention, the test agent is absolute ethyl alcohol；Before seal cavity assembling is completed,
The inner surface of seal cavity smears the paste reagent being mixed to form by absolute ethyl alcohol and adhesive.
During leak detection, the alcohol gas of volatilization are detected whether outside seal cavity using alcohol detecting device.It is described
Alcohol detecting device includes：Gas intake structure, alcohol detection sensor, signal amplification circuit and signal display structure；It is described
Gas intake structure is used to for the gas of test position to be sent to alcohol detection sensor；The alcohol detection sensor is used to examine
Whether survey has alcoholic content in transmitting the gas for coming, and exports corresponding voltage signal；The signal amplification circuit is by alcohol
The voltage signal of detection sensor is sent to signal display structure after amplifying, the signal display structure is according to the voltage letter demarcated
Relation number and alcohol concentration between, the detected alcohol concentration value of display.
Beneficial effect：
(1) the method is easy and effective, only need to be before seal cavity formation, and placement heat can produce expansion inside it
Volatile solid matter just can realize the leak detection to seal cavity as reagent under producing gas or normal temperature, without
Complicated test equipment such that it is able to the effective leak detection realized to the seal cavity of compact conformation.
(2), used as reagent, safe and reliable in use, corrosivity low to environmental toxicity is small for selection alcohol, will not be to tested
Seal cavity constitutes infringement.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the leakage detection method；
Fig. 2 is the circuit theory diagrams of alcohol gas detection sensor.
Specific embodiment
Develop simultaneously embodiment below in conjunction with the accompanying drawings, and the present invention will be described in detail.
The method it is critical only that selection one kind possesses heat and can produce volatile characteristic under expanding gas or normal temperature
Solid matter as reagent, in the seal cavity of detection needed for being positioned over.Its Cleaning Principle is：It is suitable to seal cavity during leak detection
Work as heating-up temperature, bubbing in reagent, because the micro-pressure that gas is produced is poor, has the trend of outside spilling；Work as annular seal space
When body has leakage problem, the presence of this gas componant will be detected outside seal cavity.By detecting gas leakage
Concentration, can also realize carrying out quantitative analysis to leakage.
Alcohol and ammonium hydrogen carbonate are provided with above-mentioned characteristic, but ammonia has corrosivity, and alcohol excitant is small, to environment without
Evil, after test terminates a period of time, you can vapor away residual gas, alignment type works without influence.Therefore, the present embodiment is provided
A kind of leakage of seal chamber detection method based on alcohol concentration analysis, using absolute ethyl alcohol plus a small amount of adhesive as reagent,
To detect the feasibility of the method, the reagent is used in air seal simulation architecture, to realize to air seal simulation architecture
Leak detection.
Described air seal simulation architecture includes inner cylinder and housing, wherein the two ends of periphery respectively install one outer tube
Individual rubber seal, is then sleeved on enclosure interior, rubber seal and housing interference fit by inner cylinder, and thus two rubber are close
Inner cylinder is sealing cavity configuration with the annular space that housing is formed between seal.
The idiographic flow of the method by electric spark etching mode on housing outer circumference surface as shown in figure 1, first distinguished
Carve length and width, deep respectively 10mm, 0.2mm, 0.5mm and 10mm, two breach (crackle) of 0.2mm, 1mm.Then by industrial nothing
Water-ethanol and a little paste are tuned into reagent, and then uniform application will on the inner cylinder outer circumference surface between two rubber seal
Inner cylinder and housing carry out cooperation installation, it is ensured that on the outer circumference surface of the housing of two breach between two rubber seal.
The reagent splashed down in assembling process is dried up with air-heater, and is positioned over ventilation more than 12 hours, it is ensured that alcohol liquid is only existed
In annular seal space.The inner cylinder and housing that will be assembled are placed on support.
Because industry anhydrous ethanol possesses volatile characteristic under normal temperature, therefore can be without adding to the air seal simulation architecture
Heat.The principle of alcohol detecting device is：When there is alcoholic content in sensor local environment, the electrical conductivity of sensor is with environment
The increase of middle alcohol concentration and increase, electrical conductivity is converted to by voltage corresponding with the gas concentration by Conditioning Circuits of Sensor
Signal.And can further demarcate, voltage signal is converted into corresponding concentration value, and output display, with reach detection alcohol into
Divide the purpose of concentration.
Thus described alcohol detecting device include gas intake structure, alcohol detection sensor, signal amplification circuit and
Signal display structure four part.Wherein gas intake structure is flexible pipe+getter device, and flexible pipe is used to reach near measured position,
Flexible pipe front end sets path entrance, is accurately positioned for trouble point；Getter device is small air pump, using principle of negative pressure by failure
The alcoholic content of point is drawn at alcohol detection sensor.Be used at alcohol detection sensor its alcoholic content in the environment inspection
Survey, alcohol detection sensor uses tin oxide based semiconductor device, principle is simple, easy to use.Alcohol detection sensor is because of wine
The useful signal amplitude very little that smart composition is produced, need to be effective by the voltage signal of alcohol detection sensor by signal amplification circuit
Amplify.Signal display structure is used to receive the voltage signal after amplifying through signal amplification circuit, and according to the voltage signal demarcated
Relation between alcohol concentration, the detected alcohol concentration value of display.Its principle is as shown in Figure 2.
Alcohol detecting device is connected before detection, after alcohol detecting device reaches steady-working state, it may appear that 0-0.03V
Fluctuation.Due to positive confinement can not be accomplished, when alcohol detecting device is near annular seal space, has the signal no more than 0.3V and produce
It is raw.The signal alcohol detecting device apart from annular seal space 4cm and the above apart from when will disappear, therefore have substantially no effect on detection knot
Really.
During formal detection, the gas intake structure in alcohol detecting device is distinguished radially, axially adjacent to breach, and pin
Two various sizes of crackles are detected respectively, if leakage of seal chamber, alcohol steam is had and is leaked from indentation, there.Its inspection
Survey result as shown in the table：
Crackle A (length and width, deep respectively 10mm, 0.2mm, 0.5mm)：
By the gas intake structure in alcohol detecting device radially near crackle A, detected voltage and distance
Relation is as shown in table 1：
Table 1：Along crackle A radial direction test results
| Distance/cm | 18 | 15 | 12 | 9 | 6 | 3 | 0.5 |
| Voltage/V | 0 | 0.1 | 0.4 | 1.0 | 1.6 | 2.0 | 3.1 |
By the gas intake structure in alcohol detecting device axially move closer to crackle A, detected voltage and distance
Relation is as shown in table 2：
Table 2：Crackle A axial directions test result
| Distance/cm | 20 | 18 | 12 | 9 | 6 | 3 | 0.5 |
| Voltage/V | 0 | 0.1 | 0.5 | 1.0 | 1.4 | 2.3 | 3.1 |
Crackle B (length and width, deep respectively 10mm, 0.2mm, 1mm)：
By the gas intake structure in alcohol detecting device radially near crackle B, detected voltage and distance
Relation is as shown in table 3：
Table 3：Along crackle B radial direction test results
| Distance/cm | 18 | 15 | 12 | 9 | 6 | 3 | 0.5 |
| Voltage/V | 0 | 0.1 | 0.3 | 0.8 | 1.4 | 1.9 | 2.8 |
By the gas intake structure in alcohol detecting device axially move closer to crackle B, detected voltage and distance
Relation is as shown in table 4：
Table 4：Crackle B radial direction test results
| Distance/cm | 20 | 18 | 12 | 9 | 6 | 3 | 0.5 |
| Voltage/V | 0 | 0.1 | 0.4 | 1.0 | 1.2 | 2.1 | 2.8 |
By above testing result：The air seal simulation architecture has leakage at crackle A and crackle B, and splits
Leaked at line A even more serious.
Alcohol gas concentration detected by judges leakage of seal chamber degree.
In sum, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in of the invention
Within protection domain.
Claims (4)
1. the leakage of seal chamber detection method of Self-expanding gas is based on, it is characterised in that before seal cavity assembling is completed,
Its internal placement test agent；The test agent can produce volatile solid matter under expanding gas or normal temperature for heat；
During leak detection, the gas componant with the presence of test agent is detected whether outside seal cavity, show that seal cavity goes out if having
Now leak, otherwise show that seal cavity is not leaked；
For expanding gas can be produced as the seal cavity of test agent using heat, before leak detection, first by seal cavity
It is heated to the temperature needed for test agent expansion produces gas.
2. the leakage of seal chamber detection method based on Self-expanding gas as claimed in claim 1, it is characterised in that when
In the presence of detecting the gas componant of test agent outside seal cavity, the gas componant of the test agent detected by it is dense
Degree judges leakage of seal chamber degree.
3. the leakage of seal chamber detection method of Self-expanding gas is based on as claimed in claim 1 or 2, it is characterised in that
The test agent is absolute ethyl alcohol；Before seal cavity assembling is completed, smear by absolute ethyl alcohol in the inner surface of seal cavity and
The paste reagent that adhesive is mixed to form.
4. the leakage of seal chamber detection method analyzed based on Self-expanding gas concentration as claimed in claim 3, its feature is existed
During leak detection, the alcohol gas of volatilization being detected whether outside seal cavity using alcohol detecting device；
The alcohol detecting device includes：Gas intake structure, alcohol detection sensor, signal amplification circuit and signal display knot
Structure；The gas intake structure is used to for the gas of test position to be sent to alcohol detection sensor；The alcohol detection sensing
Whether device is used to detect in the gas for transmitting and there is alcoholic content, and exports corresponding voltage signal；The signal amplifies electricity
Road is sent to signal display structure after the voltage signal of alcohol detection sensor is amplified, the signal display structure is according to demarcation
Voltage signal and alcohol concentration between relation, the detected alcohol concentration value of display.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611019824.9A CN106768688B (en) | 2016-11-18 | 2016-11-18 | Leakage of seal chamber detection method based on Self-expanding gas |
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| CN201611019824.9A CN106768688B (en) | 2016-11-18 | 2016-11-18 | Leakage of seal chamber detection method based on Self-expanding gas |
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| CN106768688B CN106768688B (en) | 2019-05-21 |
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Cited By (1)
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| CN109900431A (en) * | 2018-11-13 | 2019-06-18 | 阿里巴巴集团控股有限公司 | The detection method and device of container state, electronic equipment |
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