CN107907273A - A kind of partially sealed outer surface air-tightness detection method of product - Google Patents
A kind of partially sealed outer surface air-tightness detection method of product Download PDFInfo
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- CN107907273A CN107907273A CN201711056985.XA CN201711056985A CN107907273A CN 107907273 A CN107907273 A CN 107907273A CN 201711056985 A CN201711056985 A CN 201711056985A CN 107907273 A CN107907273 A CN 107907273A
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- G—PHYSICS
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- 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
Abstract
A kind of partially sealed outer surface air-tightness detection method of product, belongs to air-leakage test technical field.The object of this method operation includes connection chamber, vacuum chamber, annular seal space, vacuum pump；Annular seal space is installed along with product testing position with coupling chamber during work, annular seal space is in connection intracavitary portion, vacuum environment is provided by vacuum pump, vacuum chamber connects connection chamber and annular seal space and sets vacuum valve in junction to provide working environment for connection chamber and annular seal space respectively, vacuum chamber, annular seal space, connection chamber dispose vacuum meter respectively, by the situation for measuring annular seal space, coupling the vacuum pressure of intracavitary and its changing over time, calculate and examine the air-tightness of the partially sealed special-shaped outer surface of product.This method is suitable for being difficult to being directed to the air tight test that the product with certain cavity volume volume carries out part in the case of totally-enclosed air-leakage test, detection efficiency is high, it is easy to operation, it can be achieved that product is partially sealed and condition it is simple and crude in the case of carry out portable, quick air-leakage test.
Description
Technical field
The invention belongs to air-leakage test technical field, is examined more particularly to a kind of partially sealed outer surface air-tightness of product
Survey method, the air-tightness for the partially sealed special-shaped surfaces of product carry out portable, quick detection.
Background technology
During finished product storage, the sealing performance of product external packaging directly affects the reliability that product stores for a long time.
Situation to prevent product from being failed due to outer packing gas leakage is occurred, and product integrality (air-tightness) detection obtains wide in production
General application.But due to the limitation of technical conditions, currently detected more using full enclosed for all-sealed product integrity detection
Equipment is detected products air tightness, or only carries out the gas tightness detection of semi finished package, and can not also be directed to has one
The product for determining volume carries out the air tight test of finished product.Since no method is detected, a considerable amount of products are produced at it
Often holiday detection content in technique, this necessarily introduces certain quality risk, influences the reliability of product storage.Cause
This, it will be that product integrality (air-tightness) examines the weight considered to develop a kind of partially sealed outer surface air-tightness detection method of product
Want problem.Carry out quick, portable air tight test for product external surfaces has suitable for using negative pressure method, but how to be directed to
It is phase key technical problem to be solved in industry that the product external surfaces of certain volume, which carry out air tight test,.First, for tool
The product surface for having certain volume carries out air-leakage test and is difficult to use all-sealed detection method, it is necessary to takes for product
The mode of local surfaces detection.However, product variety to be detected is numerous and diverse, every kind of product external surfaces pattern is different, or even some productions
The partially sealed position of product is peculiarly shaped.Air-leakage test is carried out for product part outer surface, detecting instrument connects with product surface
The density of conjunction also influences the reliability of air-leakage test, this some effects must embody in air-leakage test result.
Furthermore due to the situation of product batch production, it is desirable to which product each Check-Out Time is of short duration.Therefore, what kind of detection method developed
Ensure that products air tightness detection is easily achieved, detect quick, conclusion and accurately etc. all have certain challenge.At present, both at home and abroad
Do not find that one kind takes into full account the leakage of measuring method gas itself and is adapted to finished product special-shaped surfaces air-tightness detection method also.
The content of the invention
Present invention aim to address the above problem, proposes a kind of partially sealed outer surface air-tightness detection method of product,
For the partially sealed special-shaped surfaces air-leakage test of product.
The present invention seeks to what is be achieved through the following technical solutions.
A kind of partially sealed outer surface air-tightness detection method of product, it is characterised in that：The object of this method operation includes
Couple chamber, vacuum chamber, annular seal space, vacuum pump, connection chamber is used to couple product detected part and build jointly with detected part close
The detected space closed, vacuum chamber are used to build the vacuum environment needed for air-leakage test process, and annular seal space is used to detect connection chamber
Sealing effect, provide vacuum environment when vacuum pump is used for work for connection chamber, vacuum chamber, annular seal space；Vacuum pump passes through vacuum
Pipe is connected with vacuum chamber, and vacuum chamber is connected with annular seal space, connection chamber respectively by vacuum tube；In vacuum pump and vacuum chamber, vacuum
Chamber and annular seal space, vacuum chamber and the junction for coupling chamber are respectively connection chamber by setting vacuum valve control piper break-make
Working environment is provided with annular seal space；Annular seal space is connected and is socketed connection chamber；During work, annular seal space is installed along with production with coupling chamber
Product detection position, the closed cavity of two sockets is collectively formed with position to be detected, by being examined in annular seal space, connection chamber and product
Surveying position placement sealant rubber ring ensures the leakproofness of interface；Vacuum chamber, annular seal space, connection chamber set vacuum meter respectively, pass through
Measurement vacuum chamber, annular seal space, the vacuum pressure for coupling chamber and its situation about changing over time, calculate and examine product partially sealed
Air-tightness；
Specifically include following steps：
Step 1：Detection perform this method instrument it is whether in running order, i.e., vacuum meter signal whether normally, vacuum
Whether valve and vacuum pump work are normal；
Step 2：Annular seal space is installed and couples chamber and ensures the leakproofness of interface at product testing position, opens vacuum pump
The valve of unicom pipeline vacuumizes vacuum chamber between vacuum chamber, observes the vacuum meter of vacuum chamber, meets when measuring vacuum chamber
The valve and vacuum pump are closed after the vacuum of job requirement；
Step 3：Opening the vacuum valve between vacuum chamber and annular seal space makes vacuum chamber be penetrated through with annular seal space, gas in annular seal space
Body pressure moment reaches balance with vacuum cavity pressure, and the vacuum valve being then powered off between vacuum chamber and annular seal space, passes through reading
The vacuum meter reading being connected with annular seal space is taken to observe whether vacuum pressure in annular seal space changes, if vacuum pressure becomes in annular seal space
Change and substantially then illustrate annular seal space working status exception, pull down annular seal space with coupling chamber return to step 2；
Step 4：Open vacuum chamber makes vacuum chamber couple intracavitary gas with coupling chamber perforation with coupling the vacuum valve between chamber
Body pressure and vacuum cavity pressure transient equilibrium, by measuring whether connection chamber vacuum pressure at this time unanimously judges with its theoretical value
Whether connection intracavitary forms vacuum environment needed for work, if it is judged that not form vacuum environment needed for work, then tears open
Lower annular seal space is with coupling chamber, return to step 2；
Step 5：Vacuum chamber is turned off with coupling the vacuum valve between chamber, is read by reading the vacuum meter being connected with connection chamber
Number observation connection intracavitary vacuum pressure whether change it is too fast, if couple the vacuum pressure in chamber change it is too fast if illustrate product inspection
Survey position leakage seriously or couple chamber operation irregularity, this process is performed again after pulling down annular seal space and coupling chamber return to step 2,
If couple the vacuum in chamber decline it is still too fast if illustrate that the leakage of product testing position is serious, detection of end process；
Step 6：Connection chamber, annular seal space keep vacuum state and stand a period of time TSurvey, by reading what is be connected with two chambers
Vacuum meter reading couples chamber, the vacuum pressure situation of change of annular seal space during monitoring this, and is changed according to the vacuum pressure of two chambers
Situation judges the air-tightness and airtight quality of sealing of the product with detection position；
Step 7：Connection cavity, annular seal space release are pulled down, detection of end process.
Preferably, the annular seal space is connected and is socketed connection chamber, both the same ends are open end, and open end is and product
Detection position outer surface is bonded completely；When carrying out the work of product part air-leakage test, the common open end of annular seal space, connection chamber
Combined and sealed with product testing position outer surface；Connection chamber is completely covered detection position and is formed with product testing position and detected
Space, annular seal space are combined formed space parcel connection chamber with product testing position outer and are examined to detect connection chamber with product
Survey position and be bonded the leakproofness to form detection space.
Preferably, the annular seal space, connection chamber are different according to the model of product, its specification, shape are needed according to product
Detection position shape customizes, and ensures that annular seal space, connection chamber open end shape are mediated completely with position to be detected；Annular seal space, connection
The connection of chamber and vacuum chamber is dismountable, easy to using dedicated annular seal space and couple chamber according to different product specification；Into one
Step, annular seal space, connection cavity configuration are designed according to requirement of engineering, and realize the quick connection of annular seal space, connection chamber and vacuum chamber.
Preferably, the working environment is built by following processes：The limiting value of vacuum first in predetermined vacuum chamber,
Then the vacuum in vacuum chamber is kept true by start and stop vacuum pump and the vacuum valve cut-off between vacuum chamber and vacuum pump
Between the limiting value of cavity, that is, the vacuum pressure for keeping vacuum chamber is PVery, it is preceding；The vacuum environment of annular seal space and connection chamber is to pass through
Break-make vacuum chamber and annular seal space, the vacuum valve coupled between chamber realize vacuum chamber respectively with annular seal space, couple vacuum shape in chamber
What the transient equilibrium of state was completed, according to vacuum level requirements design vacuum chamber needed for annular seal space during working status and connection chamber and
Annular seal space, the proportionate relationship for coupling cavity space.
Preferably, do not ensure that complete side leakage free since annular seal space is placed in product testing position, can be to air-tightness
Testing result has an impact, and to offset the influence, it is necessary to verify annular seal space sealing performance according to step 3, checking procedure is as follows：
Step 3.1：Measure the vacuum pressure P of vacuum chamberVery, it is preceding, the vacuum pressure P of measurement connection chamberJoin, is precedingIt is true with annular seal space
Pneumatics power PIt is close, preceding, the two is equal to atmospheric pressure P at this time0, the volume of vacuum chamber, connection chamber and annular seal space is respectively QVery、QConnection、QIt is close；
Step 3.2：The theoretical value for opening after vacuum valve vacuum pressure in annular seal space under stable state is calculated according to the following formula
PClose, reasonFor
The vacuum valve between vacuum chamber and annular seal space is opened, annular seal space moment is reached the vacuum with vacuum chamber balance
And keep stable, measure annular seal space vacuum pressure measured value P at this timeClose, surveyIf PClose, surveyWith PClose, reasonIt is equal, think that annular seal space seals
Property is good, meets job requirement；Otherwise it is assumed that annular seal space installation is incorrect, return to step 2 adjusts annular seal space and reinstalls；
Step 3.3：Annular seal space pressurize T for a period of timeIt is closeVacuum no longer changes in annular seal space afterwards, measures annular seal space vacuum pressure
Power PIt is close, after, leak at this time into the gas in annular seal space in atmospheric pressure P0Under volume QIt is close, afterFor
According to the vacuum pressure P in the connection chamber measured at this timeConnection, survey, calculated by following formula and annular seal space leaked into by connection chamber
Gas in atmospheric pressure P0Under volume QIt is close, connection：
The slip V leaked at this time from connection chamber to annular seal spacetCalculated by following formula：
At this time from connection chamber and pressure differential leakance rate V from chamber to annular seal space that leaked caused by the pressure difference of annular seal space from couplingtpIt is logical
Cross following formula calculating：
Pressure differential leakance rate VtpCan as pressure differential leakance rate under existing assembly relation between connection chamber and annular seal space,
The pressure differential leakance rate is believed that invariable in the range of the numerical space of very little under working status, if the dwell time product will be taken
Timesharing can observe connection chamber and the situation of change of annular seal space pressure differential leakance rate in the annular seal space dwell time, if change it is too big and
The change can not be ignored, then illustrate that annular seal space leakproofness cannot meet job requirement, its installation is incorrect, needs return to step 2
Reinstall annular seal space.
Preferably, P is judged in step 3.2Close, surveyWith PClose, reasonIt is whether equal, it is necessary to be set in advance according to air-leakage test precision
Fixed number value mobility scale, works as PClose, surveyWith PClose, reasonBetween difference then think that both are equal less than the setting value, otherwise it is assumed that both not
It is equal；Annular seal space needs pressurize T for a period of time in step 3.3It is close, the length of the dwell time need to give in advance according to product testing requirement
Fixed, the product of different size and different quality requirements can all use the different dwell times；The pressure observed in step 3.3
The situation of change of poor slip, it is also desirable to give one in advance according to product testing requirement and change section, when the change of pressure differential leakance rate
The limit D-value of change is more than the given section that changes and then thinks that change is too big, otherwise it is assumed that pressure differential leakance rate is constant.
Couple whether chamber vacuum pressure and its theoretical value are unanimously to judge at this time at this time preferably, being measured described in step 4
Couple chamber actual measurement vacuum pressure PConnection, surveyWith theoretical vacuum pressure PConnection, reasonBetween difference whether be less than setting, which needs root
It is previously set according to working condition；PConnection, reasonCalculated by following formula：
Wherein, QVeryFor vacuum chamber volume, QConnectionTo couple the volume of chamber, PVery, it is precedingConnection chamber to measure vacuumizes initial vacuum chamber
Vacuum pressure, PConnection, surveyThe vacuum pressure of connection chamber before connection chamber to measure vacuumizes.
Preferably, it is that the vacuum pressure that will couple in chamber becomes that the vacuum pressure coupled described in step 5 in chamber, which changes too fast,
Change speed to be contrasted with value is previously set, think to change too fast, the setting if vacuum pressure rate of change is more than the value
Value is previously set according to working condition.
Preferably, T described in step 6SurveyTime length presets definite according to reality of work.
Preferably, the vacuum meter reading being connected described in step 6 by reading with two chambers couples chamber, sealing during monitoring this
The vacuum pressure situation of change of chamber, and judge according to the vacuum pressure situation of change of two chambers the gas of sealing of the product with detection position
Close property and airtight quality, detailed process are as follows：
Vacuum pressure value P when vacuum state is stablized in the connection chamber read according to step 5Join, is steady, stand TSurveyJoin after time
Meet the vacuum pressure P measured in chamberConnection, after, calculate leak into connection chamber in gas in atmospheric pressure P0Under volume QConnection, surveyFor
Wherein, QConnectionTo couple the volume of chamber；
According to the pressure differential leakance rate V leaked between connection chamber and annular seal spacetpAnd stand TSurveyVacuum pressure in annular seal space after time
PIt is close, afterCalculate during standing from annular seal space to connection chamber leaked gas in atmospheric pressure P0Under volume QIt is close to connectionFor
QIt is close to connection=(PIt is close, after-PJoin, is steady)·Vtp·TSurvey,
If result of calculation QIt is close to connection<0m3, then illustrate that gas is leaked from connection chamber to annular seal space；
During standing by product testing position leak into connection chamber in gas in atmospheric pressure P0Under gas volume QProduct
For
QProduct=QConnection, survey-QIt is close to connection；
Released gas rate VProductFor
Air-leakage test standard is artificially determined according to working condition in advance, by above-mentioned result of calculation QProductAnd VProductWith air-tightness
Examination criteria contrast carries out that products air tightness is qualified or not and the judgement of airtight quality.
Beneficial effect
The prior art is contrasted, the partially sealed outer surface air-tightness detection method of product of the invention can carry out various detections
Product integrality (air-tightness) detection under operating mode, understands this method especially suitable for the complete of certain volume from obtained characteristic
The air-leakage test of whole product part special-shaped surfaces, inspection result is accurate and credible, the method for inspection is quick, is easily achieved and is suitable for
Various detection environment.
Brief description of the drawings
Fig. 1 is the basic principle schematic of the present invention.
Fig. 2 is to couple variation tendency schematic diagram of the intracavitary vacuum pressure in detection process in Fig. 1.
Fig. 3 is air tight test flow in Fig. 1 methods.
Fig. 4 is annular seal space verification and annular seal space in Fig. 1 methods, couples pressure differential leakance rate calculation process between chamber.
Reference numeral：A- preparation stages, B- vacuumizing phases, C- vacuum stabilization sub stages, D- vacuum are kept for the stage, and E- is broken very
The empty stage.
Embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment 1：
As shown in Figure 1, the object of the method for the present invention operation includes connection chamber, vacuum chamber, annular seal space, vacuum pump, couple chamber
For coupling product detected part and building closed detected space jointly with detected part, vacuum chamber is used to build air-tightness inspection
Vacuum environment needed for survey process, annular seal space are used for the sealing effect for detecting connection chamber, when vacuum pump is used for work for couple chamber,
Vacuum chamber, annular seal space provide vacuum environment；Vacuum pump is connected by vacuum tube with vacuum chamber, vacuum chamber by vacuum tube respectively with
Annular seal space, connection chamber connection；Distinguish in vacuum pump with vacuum chamber, vacuum chamber with annular seal space, vacuum chamber with coupling the junction of chamber
By set vacuum valve control piper break-make so as to for connection chamber and annular seal space working environment is provided；Annular seal space is connected and is socketed
Couple chamber；During work, annular seal space is installed along with product testing position with coupling chamber, and two sets are collectively formed with position to be detected
The closed cavity connect, by the leakproofness for ensuring interface with product testing position placement sealant rubber ring in annular seal space, connection chamber；
Vacuum chamber, annular seal space, connection chamber vacuum meter is set respectively, by measure vacuum chamber, annular seal space, couple chamber vacuum pressure and its
Situation about changing over time, calculates and examines the partially sealed air-tightness of product.
The working environment is built by following processes：The limiting value of vacuum, then passes through first in predetermined vacuum chamber
Start and stop vacuum pump and the vacuum valve cut-off between vacuum chamber and vacuum pump keep the vacuum in vacuum chamber in the pole of vacuum chamber
Between limit value, that is, the vacuum pressure for keeping vacuum chamber is PVery, it is preceding；The vacuum environment of annular seal space and connection chamber is by break-make vacuum
Room and annular seal space, the vacuum valve coupled between chamber realize vacuum chamber respectively with annular seal space, couple moment of vacuum state in chamber
Balance complete, according to annular seal space during working status and connection chamber needed for vacuum level requirements design vacuum chamber and annular seal space,
Couple the proportionate relationship of cavity space.
Couple chamber, annular seal space, vacuum chamber in the present embodiment to be all made of A3 steel, vacuum chamber is the envelope with certain space
Close structure, connection chamber, the box like structure that annular seal space is the same end opening with certain space, open end edge shape with it is to be checked
Survey position to mediate completely, during detection, connection chamber is completely covered detection position and forms detection space, sealing with product testing position
Chamber is combined formed space parcel connection chamber with product testing position outer and is pasted to detect connection chamber with product testing position
Close the detection space formed；Preferably, the connection of the two and vacuum chamber uses detachable pattern, easy to be advised according to different product
Lattice are using dedicated annular seal space and connection chamber.Certainly, chamber is coupled in this example, annular seal space uses box-like structure, actually detected process
In, not limited to this, annular seal space can be designed according to requirement of engineering, couples cavity configuration and realizes annular seal space, connection chamber and vacuum chamber
Quick connection.In this example, the volume of vacuum chamber is QVery=0.01m3, annular seal space forms enclosure space with product testing position to be held
Product is QIt is close=0.002m3, it is Q that connection chamber forms enclosure space volume with product testing positionConnection=0.002m3.Vacuum meter is all selected
CTR100N type diagram vacuum gauges, vacuum valve all select U.S.'s Nai Laisi 616G-P-11-2240TT type electric controlled vacuum valves, very
Sky pump selects German Lay treasured D16C type vacuum pumps.
As shown in Fig. 2, in the partially sealed air-leakage test of execution this method progress product, couple the vacuum pressure in chamber
Five stages are experienced, including preparation stage A, vacuumizing phase B, vacuum stabilization sub stage C, vacuum keep stage D, vacuum breaker rank
Section E.Such as Fig. 3, the characteristics of according to this five stages, the step of this method performs, is as follows：
Step 1：Whether the instrument that detection performs this method is in running order, including whether detects 3 vacuum meter signals
Normally, whether in the simultaneously off state that is powered, whether vacuum pump work is normal, opens vacuum pump and vacuum chamber for 3 vacuum valves
Between vacuum valve vacuum chamber is vacuumized, the vacuum valve is turned off when the vacuum pressure in vacuum chamber is down to 0.01MPa.
Step 2：Annular seal space is installed on product testing position, annular seal space, connection chamber and product testing position with coupling chamber
Outer surface is bonded and connection chamber is covered detection position completely completely；Open the valve of unicom pipeline between vacuum pump and vacuum chamber
Vacuum chamber is vacuumized, observes the vacuum meter of vacuum chamber, when measure the vacuum pressure in vacuum chamber stablize after after close the valve
And vacuum pump；
Step 3：Opening the vacuum valve between vacuum chamber and annular seal space makes vacuum chamber be penetrated through with annular seal space, gas in annular seal space
Body pressure moment reaches balance with vacuum cavity pressure, and the vacuum valve being then powered off between vacuum chamber and annular seal space, passes through reading
The vacuum meter reading being connected with annular seal space is taken to observe whether vacuum pressure in annular seal space changes, if vacuum pressure becomes in annular seal space
Change and substantially then illustrate annular seal space working status exception, pull down annular seal space with coupling chamber return to step 2；
Verify annular seal space working status, calculate annular seal space with coupling the pressure differential leakance rate between chamber, as shown in figure 4, step
It is as follows：
Step 3.1：Measure the vacuum pressure P of connection chamberJoin, is precedingWith annular seal space vacuum pressure PIt is close, precedingAll it is atmospheric pressure P0, i.e.,
0.1MPa；
Step 3.2：The vacuum valve between vacuum chamber and annular seal space is opened, reaches annular seal space moment and is balanced with vacuum chamber
Vacuum and keep stable, what is measured opens the vacuum pressure P of vacuum valve initial vacuum chamberVery, it is preceding=0.01MPa, calculates and stablizes
Vacuum pressure P in annular seal space under stateClose, reasonTheoretical value
Annular seal space vacuum pressure measured value P at this timeClose, survey=0.0254MPa, because of (PClose, survey-PClose, reason)/PClose, reason=0.04<5%,
So annular seal space is working properly, the vacuum pressure P of vacuum chamber at this timeVery, after=PClose, survey=0.0254MPa；If PClose, surveyIt is higher than
0.02625Mpa, then understand that annular seal space work is abnormal, needs return to step 2 to adjust annular seal space and reinstalls；
It is well known that absolute sealing and the absolute of vacuum meter measurement are accurately impossible, therefore annular seal space is true
Empty pressure measuring value can not possibly be definitely equal with theoretical value, can only approach as far as possible, it is therefore desirable to according to air-leakage test precision
Numerical value mobility scale is preset, works as PClose, surveyWith PClose, reasonBetween difference then think that both are equal less than the setting value, otherwise it is assumed that
Both are unequal；P is worked as in setting in the present embodimentClose, surveyWith PIt is close、ReasonBetween difference be less than PClose, reason5% when, it is believed that both are equal；When
So, one skilled in the art will appreciate that different values can be set according to different application scenarios.
Step 3.3：Close vacuum valve, annular seal space pressurize T for a period of timeIt is close(5 minutes) vacuum is no longer in annular seal space afterwards
Change, then measures annular seal space vacuum pressure PIt is close, after=0.0254MPa, leaks into the gas in annular seal space in atmospheric pressure P at this time0
Under volume QIt is close, afterFor
According to the vacuum pressure P in the connection chamber measured at this timeConnection, survey=0.1MPa, can calculate leaked into by connection chamber it is close
The gas of chamber is sealed in atmospheric pressure P0Under volume QIt is close, connectionFor
The slip V leaked at this time from connection chamber to annular seal spacetFor
Couple pressure differential leakance rate V caused by pressure difference between chamber and annular seal space at this timetpFor
In the present embodiment, dwell time TIt is closeIt is set as 5 minutes, one skilled in the art will appreciate that actual test product thousand is poor
Ten thousand are not, and measurement request is not quite similar, and vacuum chamber, connection chamber, the volume of annular seal space and the model of vacuum pump are likely to difference,
Therefore TIt is closeIt is also not necessarily limited to 5 minutes, can be set according to actual condition, as long as is unsatisfactory for requiring by frock during can observing herein
Annular seal space investigate out, i.e., pressure difference change too greatly.
In the present embodiment, according to the V that is calculated of observationtpFor 0, in actual measurement process, this value, which differs, is set to 0, also may be used
It can be the value of a very little, therefore be also required to give a variation section in advance according to product testing requirement, when pressure differential leakance rate
The limit D-value of change is more than the given section that changes and then thinks that change is too big, otherwise it is assumed that pressure differential leakance rate is constant.
Step 4：Open vacuum chamber makes vacuum chamber couple intracavitary gas with coupling chamber perforation with coupling the vacuum valve between chamber
Body pressure and vacuum cavity pressure transient equilibrium, by measuring whether connection chamber vacuum pressure at this time unanimously judges with its theoretical value
Whether connection intracavitary forms vacuum environment needed for work, if it is judged that not form vacuum environment needed for work, then tears open
Lower annular seal space is with coupling chamber, return to step 2；
Open vacuum chamber makes connection chamber be evacuated to work requirements with coupling the vacuum valve between chamber, and connection chamber vacuumizes
Theoretical vacuum pressure P during to work requirementsConnection, reasonFor
Couple chamber actual measurement vacuum pressure P at this timeConnection, survey=0.026MPa, with theoretical vacuum pressure PConnection, reasonBetween difference be
0.0005MPa, the difference and theoretical vacuum pressure PConnection, reasonRatio is 0.0294, less than 5%, illustrates that connection chamber is working properly.
Step 5：Shut-off and couples the vacuum valve between chamber at vacuum chamber, waits intracavitary vacuum state to be coupled to stablizing shape
State, it is too fast whether the vacuum meter reading observation connection intracavitary vacuum pressure being connected by reading with connection chamber changes, if connection
Vacuum pressure change in chamber is too fast, illustrates that the leakage of product testing position is serious or couples chamber operation irregularity, pulls down annular seal space
With performing this process again after coupling chamber return to step 2, if couple the vacuum in chamber decline it is still too fast if illustrate product
Detection position leakage is serious, detection of end process；
In the present embodiment, the vacuum meter during this in observation connection chamber surveys vacuum pressure value PJoin, is steady=
0.026MPa, because of PJoin, is steady-PConnection, survey=0, so connection chamber working status is normal.
Same as above, positive confinement is impossible, therefore it is too fast to judge whether the vacuum pressure in connection chamber changes
It should be contrasted with value is previously set, just think to change higher than the value too fast；Otherwise, it is believed that do not change, couple
Chamber is working properly.
Step 6：Connection chamber, annular seal space keep vacuum state and stand a period of time TSurveyBy reading and two after (5 minutes)
The vacuum meter reading that chamber is connected couples chamber, the vacuum pressure situation of change of annular seal space during monitoring this, and according to the vacuum of two chambers
Pressure changing judges the air-tightness and airtight quality of sealing of the product with detection position；
In the present embodiment, couple the vacuum pressure P measured in chamberConnection, after=0.026MPa, calculating are leaked into connection chamber
Gas is in atmospheric pressure P0Under volume be
According to the pressure differential leakance rate V leaked between connection chamber and annular seal spacetpAnd vacuum pressure P in annular seal spaceIt is close, after, stand process
In from annular seal space to connection chamber leaked gas in atmospheric pressure P0Under volume QIt is close to connectionFor
QIt is close to connection=(PIt is close, after-PJoin, is steady)·Vtp·TSurvey=0m3；
During standing, by product cavity by detection position sealing leak into connection chamber in gas in atmospheric pressure P0
Under gas volume QProductFor
QProduct=QConnection, survey-QIt is close to connection=0m3,
Released gas rate VProductFor
Because of QProductLess than 5% and released gas rate V of product cavity volumeProductFor 0m3/ min, judges that product is partially sealed
Air-tightness meets examination criteria requirement.
In the present embodiment, dwell time TIt is closeIt is set as 5 minutes, same as above, which should also set according to actual condition.
Step 7：By connection chamber 10,8 release of annular seal space and pull down, terminate this time to detect, wait next airtightness measurement.
Above-described specific descriptions, have carried out further specifically the purpose, technical solution and beneficial effect of invention
It is bright, it should be understood that the foregoing is merely the specific embodiment of the present invention, the protection model being not intended to limit the present invention
Enclose, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should be included in the present invention
Protection domain.
Claims (10)
- A kind of 1. partially sealed outer surface air-tightness detection method of product, it is characterised in that：The object of this method operation includes connection Chamber, vacuum chamber, annular seal space, vacuum pump are connect, connection chamber is used to couple product detected part and build jointly with detected part closed Detected space, vacuum chamber is used to build vacuum environment needed for air-leakage test process, and annular seal space is used to detect connection chamber Sealing effect, vacuum environment is provided when vacuum pump is used for work for connection chamber, vacuum chamber, annular seal space；Vacuum pump passes through vacuum tube It is connected with vacuum chamber, vacuum chamber is connected with annular seal space, connection chamber respectively by vacuum tube；In vacuum pump and vacuum chamber, vacuum chamber With annular seal space, vacuum chamber with couple the junction of chamber respectively by setting vacuum valve control piper break-make so as to for connection chamber and Annular seal space provides working environment；Annular seal space is connected and is socketed connection chamber；During work, annular seal space is installed along with product with coupling chamber Detection position, the closed cavity of two sockets is collectively formed with position to be detected, by annular seal space, connection chamber and product testing Sealant rubber ring is placed at position ensures the leakproofness of interface；Vacuum chamber, annular seal space, connection chamber set vacuum meter respectively, pass through survey Amount vacuum chamber, annular seal space, the vacuum pressure for coupling chamber and its situation about changing over time, calculate and examine product partially sealed Air-tightness；Specifically include following steps：Step 1：Detection perform this method instrument it is whether in running order, i.e., vacuum meter signal whether normally, vacuum valve It is whether normal with vacuum pump work；Step 2：At product testing position, installation and couple chamber and ensures the leakproofness of interface annular seal space, opens vacuum pump and very The valve of unicom pipeline vacuumizes vacuum chamber between cavity, observes the vacuum meter of vacuum chamber, meets work when measuring vacuum chamber It is required that vacuum after close the valve and vacuum pump；Step 3：Opening the vacuum valve between vacuum chamber and annular seal space makes vacuum chamber be penetrated through with annular seal space, seals intracavity gas pressure Power moment and vacuum cavity pressure reach balance, the vacuum valve being then powered off between vacuum chamber and annular seal space, by reading and Whether vacuum pressure changes in the vacuum meter reading observation annular seal space that annular seal space is connected, if vacuum pressure change is bright in annular seal space It is aobvious then illustrate annular seal space working status exception, pull down annular seal space with coupling chamber return to step 2；Step 4：Open vacuum chamber makes vacuum chamber couple intracavity gas pressure with coupling chamber perforation with coupling the vacuum valve between chamber Power and vacuum cavity pressure transient equilibrium, couple whether chamber vacuum pressure unanimously judges to couple with its theoretical value at this time by measuring Whether intracavitary forms vacuum environment needed for work, if it is judged that not form vacuum environment needed for work, then pulls down close Chamber is sealed with coupling chamber, return to step 2；Step 5：Vacuum chamber is turned off with coupling the vacuum valve between chamber, is seen by reading the vacuum meter reading being connected with connection chamber Survey connection intracavitary vacuum pressure whether change it is too fast, if couple the vacuum pressure in chamber change it is too fast if illustrate product testing portion Position leakage is serious or couples chamber operation irregularity, this process is performed again after pulling down annular seal space and coupling chamber return to step 2, if The vacuum decline coupled in chamber is still too fast, illustrates that the leakage of product testing position is serious, detection of end process；Step 6：Connection chamber, annular seal space keep vacuum state and stand a period of time TSurvey, by reading the vacuum being connected with two chambers Meter reading couples chamber, the vacuum pressure situation of change of annular seal space during monitoring this, and according to the vacuum pressure situation of change of two chambers Judge the air-tightness and airtight quality of sealing of the product with detection position；Step 7：Connection cavity, annular seal space release are pulled down, detection of end process.
- A kind of 2. partially sealed outer surface air-tightness detection method of product according to claim 1, it is characterised in that：It is described close Envelope chamber is connected and is socketed connection chamber, both the same ends are open end, and open end is to be bonded completely with product testing position outer surface； When carrying out the work of product part air-leakage test, the common open end of annular seal space, connection chamber and product testing position outer surface are tied Merge sealing；Connection chamber is completely covered detection position and forms detection space, annular seal space and product testing with product testing position Combination formed space parcel connection chamber in position outer is bonded to form detection sky to detect connection chamber with product testing position Between leakproofness.
- A kind of 3. partially sealed outer surface air-tightness detection method of product according to claim 2, it is characterised in that：It is described close It is different according to the model of product to seal chamber, connection chamber, its specification, shape need, according to the customization of product testing position shape, to ensure close Envelope chamber, connection chamber open end shape are mediated completely with position to be detected；The connection of annular seal space, connection chamber and vacuum chamber is detachable , easy to using dedicated annular seal space and couple chamber according to different product specification；Further, designed and sealed according to requirement of engineering Chamber, connection cavity configuration, and realize the quick connection of annular seal space, connection chamber and vacuum chamber.
- A kind of 4. partially sealed outer surface air-tightness detection method of product according to claim 1, it is characterised in that：The work Make environment to build by following processes：The limiting value of vacuum first in predetermined vacuum chamber, then by start and stop vacuum pump and opening Disconnected vacuum valve between vacuum chamber and vacuum pump keeps the vacuum in vacuum chamber to be kept between the limiting value of vacuum chamber The vacuum pressure of vacuum chamber is PVery, it is preceding；Annular seal space and couple the vacuum environment of chamber and be by break-make vacuum chamber and annular seal space, couple Vacuum valve between chamber realize vacuum chamber respectively with annular seal space, couple vacuum state in chamber transient equilibrium complete, according to Vacuum level requirements design vacuum chamber and annular seal space, the ratio of connection cavity space needed for annular seal space and connection chamber during working status Relation.
- A kind of 5. partially sealed outer surface air-tightness detection method of product according to claim 1, it is characterised in that：Due to close Envelope chamber is placed in product testing position and does not ensure that complete side leakage free, can have an impact to air-leakage test result, should to offset Influence, it is necessary to verify annular seal space sealing performance according to step 3, checking procedure is as follows：Step 3.1：Measure the vacuum pressure P of vacuum chamberVery, it is preceding, the vacuum pressure P of measurement connection chamberJoin, is precedingWith the vacuum pressure of annular seal space Power PIt is close, preceding, the two is equal to atmospheric pressure P at this time0, the volume of vacuum chamber, connection chamber and annular seal space is respectively QVery、QConnection、QIt is close；Step 3.2：The theoretical value P for opening after vacuum valve vacuum pressure in annular seal space under stable state is calculated according to the following formulaClose, reasonForThe vacuum valve between vacuum chamber and annular seal space is opened, annular seal space moment is reached and the vacuum of vacuum chamber balance and guarantor It is fixed to keep steady, and measures annular seal space vacuum pressure measured value P at this timeClose, surveyIf PClose, surveyWith PClose, reasonIt is equal, think annular seal space leakproofness It is good, meet job requirement；Otherwise it is assumed that annular seal space installation is incorrect, return to step 2 adjusts annular seal space and reinstalls；Step 3.3：Annular seal space pressurize T for a period of timeIt is closeVacuum no longer changes in annular seal space afterwards, measures annular seal space vacuum pressure PIt is close, after, leak at this time into the gas in annular seal space in atmospheric pressure P0Under volume QIt is close, afterForAccording to the vacuum pressure P in the connection chamber measured at this timeConnection, survey, the gas that annular seal space is leaked into by connection chamber is calculated by following formula Body is in atmospheric pressure P0Under volume QIt is close, connection：The slip V leaked at this time from connection chamber to annular seal spacetCalculated by following formula：At this time from connection chamber and pressure differential leakance rate V from chamber to annular seal space that leaked caused by the pressure difference of annular seal space from couplingtpUnder Formula calculates：Pressure differential leakance rate VtpIt can work as the pressure differential leakance rate between connection chamber and annular seal space under existing assembly relation The pressure differential leakance rate is believed that invariable in the range of the numerical space of very little under state, if the dwell time will take integration Connection chamber and the situation of change of annular seal space pressure differential leakance rate in the annular seal space dwell time are can observe, if changing the too big and change Change can not be ignored, then illustrate that annular seal space leakproofness cannot meet job requirement, its installation is incorrect, needs return to step 2 again Annular seal space is installed.
- A kind of 6. partially sealed outer surface air-tightness detection method of product according to claim 5, it is characterised in that：Step P is judged in 3.2Close, surveyWith PClose, reasonIt is whether equal, it is necessary to preset numerical value mobility scale according to air-leakage test precision, work as PClose, survey With PClose, reasonBetween difference then think that both are equal less than the setting value, otherwise it is assumed that both are unequal；Annular seal space in step 3.3 Need pressurize T for a period of timeIt is close, the length of the dwell time need to be given in advance according to product testing requirement, the product of different size and Different quality requirements can all use the different dwell times；The situation of change of the pressure differential leakance rate observed in step 3.3, It is also required to give a variation section in advance according to product testing requirement, when the limit D-value of the change of pressure differential leakance rate is given more than this Surely change section and then think that change is too big, otherwise it is assumed that pressure differential leakance rate is constant.
- A kind of 7. partially sealed outer surface air-tightness detection method of product according to claim 1, it is characterised in that：Step 4 Whether it is unanimously to judge to couple chamber actual measurement vacuum pressure P at this time that the measurement couples chamber vacuum pressure with its theoretical value at this timeConnection, survey With theoretical vacuum pressure PConnection, reasonBetween difference whether be less than setting, which need to be previously set according to working condition；PConnection, reason Calculated by following formula：Wherein, QVeryFor vacuum chamber volume, QConnectionTo couple the volume of chamber, PVery, it is precedingConnection chamber to measure vacuumizes the true of initial vacuum chamber Pneumatics power, PConnection, surveyThe vacuum pressure of connection chamber before connection chamber to measure vacuumizes.
- A kind of 8. partially sealed outer surface air-tightness detection method of product according to claim 1, it is characterised in that：Step 5 It is to carry out the vacuum pressure rate of change coupled in chamber with value is previously set that vacuum pressure in the connection chamber, which changes too fast, Contrast, too fast more than thinking to change if the value if vacuum pressure rate of change, which is previously set according to working condition.
- 9. according to a kind of any partially sealed outer surface air-tightness detection methods of product of claim 1-8, it is characterised in that： T described in step 6SurveyTime length presets definite according to reality of work.
- A kind of 10. partially sealed outer surface air-tightness detection method of product according to claim 5, it is characterised in that：Step 6 The vacuum meter reading being connected by reading with two chambers couples the vacuum pressure situation of change of chamber, annular seal space during monitoring this, And the air-tightness and airtight quality of the sealing at product position to be detected, specific mistake are judged according to the vacuum pressure situation of change of two chambers Journey is as follows：Vacuum pressure value P when vacuum state is stablized in the connection chamber read according to step 5Join, is steady, stand TSurveyCouple after time in chamber The vacuum pressure P measuredConnection, after, calculate leak into connection chamber in gas in atmospheric pressure P0Under volume QConnection, surveyForWherein, QConnectionTo couple the volume of chamber；According to the pressure differential leakance rate V leaked between connection chamber and annular seal spacetpAnd stand TSurveyVacuum pressure P in annular seal space after timeIt is close, after Calculate during standing from annular seal space to connection chamber leaked gas in atmospheric pressure P0Under volume QIt is close to connectionForQIt is close to connection=(PJoin, is steady-PIt is close, after)·Vtp·TSurvey,If result of calculation QIt is close to connection<0m3, then illustrate that gas is leaked from connection chamber to annular seal space；During standing by product testing position leak into connection chamber in gas in atmospheric pressure P0Under gas volume QProductForQProduct=QConnection, survey-QIt is close to connection；Released gas rate VProductForAir-leakage test standard is artificially determined according to working condition in advance, by above-mentioned result of calculation QProductAnd VProductWith air-leakage test Comparison of standards carries out that products air tightness is qualified or not and the judgement of airtight quality.
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