CN107907273B - 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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- CN107907273B CN107907273B CN201711056985.XA CN201711056985A CN107907273B CN 107907273 B CN107907273 B CN 107907273B CN 201711056985 A CN201711056985 A CN 201711056985A CN 107907273 B CN107907273 B CN 107907273B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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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, seal chamber, vacuum pump；Seal chamber is installed along with product testing position with chamber is coupled when work, seal chamber, which is in, couples intracavitary portion, vacuum environment is provided by vacuum pump, vacuum chamber is separately connected connection chamber and seal chamber and vacuum valve is arranged to provide working environment for connection chamber and seal chamber in junction, vacuum chamber, seal chamber, connection chamber dispose vacuum meter respectively, the case where by the intracavitary vacuum pressure of measurement seal chamber, connection and its changing over time calculates and examines the air-tightness of the partially sealed special-shaped outer surface of product.This method is suitable for being difficult to carry out carrying out local air tight test for the product with certain cavity volume in the case of totally-enclosed air-leakage test, detection efficiency is high, convenient for operation, it can be achieved that carrying out portable, quick air-leakage test under product is partially sealed and the simple and crude situation of condition.
Description
Technical field
The invention belongs to air-leakage test technical fields, examine 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 technique
During finished product storage, the sealing performance of product external packaging directly affects the reliability that product stores for a long time.
The case where to prevent product from failing due to outer packing gas leakage, product integrality (air-tightness) detection obtain wide in production
General application.But due to the limitation of technical conditions, currently full enclosed is mostly used to detect for all-sealed product integrity detection
Equipment detects products air tightness, or only carries out the gas tightness detection of semi finished package, can not also be for one
The product for determining volume carries out the air tight test of finished product.Due to not having method to be detected, a considerable amount of products are in its production
Often holiday detection content in technique, this necessarily introduces certain quality risk, influences the reliability of product storage.Cause
This, developing a kind of partially sealed outer surface air-tightness detection method of product will be that product integrality (air-tightness) examines the weight considered
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,.Firstly, for tool
There is the product surface of certain volume to carry out air-leakage test to be difficult to using all-sealed detection method, it is necessary to take for product
The mode of local surfaces detection.However, product variety to be detected is many and diverse, every kind of product external surfaces pattern is different or even certain 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 be embodied in air-leakage test result.
Furthermore the case where due to product batch production, it is desirable that product each Check-Out Time is of short duration.Therefore, what kind of detection method developed
Ensure products air tightness detection be easily achieved, detect quickly, conclusion it is accurate etc. all with certain challenge.Currently, both at home and abroad
Do not find that one kind fully considers the leakage of measurement method gas itself and is suitble to finished product special-shaped surfaces air-tightness detection method also.
Summary of the invention
Present invention aim to address the above problems, propose 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.
Object of the present invention is 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: this method operation object include
Couple chamber, vacuum chamber, seal chamber, vacuum pump, connection chamber is for coupling product detected part and constructing jointly with detected part close
The detected space closed, vacuum chamber is for vacuum environment needed for building air-leakage test process, and seal chamber is for detecting connection chamber
Sealing effect, when vacuum pump is used for work to couple chamber, vacuum chamber, seal chamber provide vacuum environment；Vacuum pump passes through vacuum
Pipe is connect with vacuum chamber, and vacuum chamber is connect with seal chamber, connection chamber respectively by vacuum tube；In vacuum pump and vacuum chamber, vacuum
Chamber passes through setting vacuum valve control piper on-off respectively with seal chamber, vacuum chamber with the junction for coupling chamber to be connection chamber
Working environment is provided with seal chamber；Seal chamber is connected and is socketed connection chamber；When work, seal chamber is installed along with production with chamber is coupled
Product detection position collectively forms the closed cavity of two sockets with position to be detected, by examining in seal chamber, connection chamber and product
Surveying position placement sealing rubber ring ensures the leakproofness of interface；Vacuum meter is respectively set in vacuum chamber, seal chamber, connection chamber, passes through
The case where measuring vacuum chamber, seal chamber, the vacuum pressure for coupling chamber and its changing over time, calculates and examines product partially sealed
Air-tightness；
Specifically includes the following steps:
Step 1: whether the instrument that detection executes this method is in running order, i.e., whether vacuum meter signal normal, vacuum
Whether valve and vacuum pump work are normal；
Step 2: at product testing position installation seal chamber with couple chamber and ensure the leakproofness of interface, opening vacuum pump
The valve of connection 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 degree of job requirement；
Step 3: opening the vacuum valve between vacuum chamber and seal chamber penetrates through vacuum chamber and seal chamber, gas in seal chamber
Body pressure moment and vacuum cavity pressure reach balance, and the vacuum valve being then powered off between vacuum chamber and seal chamber passes through reading
Take whether vacuum pressure in the vacuum meter being connected with seal chamber reading observation seal chamber changes, if vacuum pressure becomes in seal chamber
Change and obviously then illustrate that seal chamber working condition is abnormal, remove seal chamber with couple chamber return step 2；
Step 4: opening vacuum chamber penetrates through vacuum chamber with chamber is coupled with the vacuum valve coupled between chamber, couples intracavitary gas
Body pressure and the transient equilibrium of vacuum cavity pressure couple whether chamber vacuum pressure unanimously judges with its theoretical value by measurement at this time
Couple it is intracavitary whether form vacuum environment needed for work, if it is judged that then being torn open for vacuum environment needed for not formed work
Lower seal chamber with couple chamber, return step 2；
Step 5: shutdown vacuum chamber with couple the vacuum valve between chamber, pass through read with couple chamber be connected vacuum meter reading
It is too fast whether the intracavitary vacuum pressure of number observation connection changes, and illustrates that product is examined if the vacuum pressure variation in connection chamber is too fast
Survey that position leakage is serious or connection chamber operation irregularity, remove seal chamber with couple chamber return step 2 after execute this process again,
Illustrate that the leakage of product testing position is serious if the vacuum degree decline in connection chamber is still too fast, terminates detection process；
Step 6: connection chamber, seal chamber keep vacuum state and stand a period of time TIt surveys, it is connected by reading with two chambers
Vacuum meter reading couples the vacuum pressure situation of change of chamber, seal chamber 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, seal chamber release being removed, detection process is terminated.
Preferably, the seal chamber is connected and is socketed connection chamber, the two the same end is 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 seal chamber, connection chamber
In conjunction with the outer surface of product testing position and seal；Connection chamber is completely covered detection position and is formed with product testing position and detected
Space, seal chamber are formed by space package connection chamber in conjunction with the outer of product testing position and examine to detect connection chamber and product
It surveys position and is bonded the leakproofness to form detection space.
Preferably, the seal chamber, connection chamber are different according to the model of product, specification, shape are needed according to product
The customization of detection position shape guarantees that seal chamber, connection chamber open end shape are mediated completely with position to be detected；Seal chamber, connection
The connection of chamber and vacuum chamber is removably, convenient for using dedicated seal chamber and coupling chamber according to different product specification；Into one
Step, seal chamber, connection cavity configuration, and the quick connection realized seal chamber, couple chamber and vacuum chamber are designed according to requirement of engineering.
Preferably, the working environment is built by following processes: the limiting value of vacuum degree first in predetermined vacuum chamber,
Then passing through start and stop vacuum pump and cut-offfing the vacuum valve between vacuum chamber and vacuum pump keeps the vacuum degree in vacuum chamber true
Between the limiting value of cavity, i.e. the vacuum pressure of holding vacuum chamber is PVery, preceding；The vacuum environment of seal chamber and connection chamber is to pass through
On-off vacuum chamber and seal chamber, the vacuum valve for coupling between chamber realize vacuum chamber respectively with seal chamber, couple vacuum shape in chamber
What the transient equilibrium of state was completed, according to vacuum level requirements design vacuum chamber needed for seal chamber when working condition and connection chamber and
Seal chamber, the proportionate relationship for coupling cavity space.
Preferably, complete side leakage free is not ensured that since seal chamber is placed in product testing position, it can be to air-tightness
Testing result has an impact, and to offset the influence, needs to verify seal chamber sealing performance according to step 3, checking procedure is as follows:
Step 3.1: measuring the vacuum pressure P of vacuum chamberVery, preceding, the vacuum pressure P of measurement connection chamberJoin, is precedingIt is true with seal chamber
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 seal chamber is respectively QVery、QConnection、QIt is close；
Step 3.2: calculating after opening vacuum valve the theoretical value of vacuum pressure in seal chamber under stable state according to the following formula
PClose, reasonFor
The vacuum valve between vacuum chamber and seal chamber is opened, seal chamber moment is made to reach the vacuum degree with vacuum chamber balance
And keep stable, measure seal chamber vacuum pressure measured value P at this timeClose, surveyIf PClose, surveyWith PClose, reasonIt is equal, think that seal chamber seals
Property is good, meets job requirement；Otherwise it is assumed that seal chamber installation is incorrect, return step 2 adjusts seal chamber and reinstalls；
Step 3.3: seal chamber pressure maintaining T for a period of timeIt is closeVacuum degree no longer changes in seal chamber afterwards, measures seal chamber vacuum pressure
Power PIt is close, after, leaked at this time into the gas in seal chamber in atmospheric pressure P0Under volume QIt is close, afterFor
According to the vacuum pressure P in the connection chamber measured at this timeConnection is surveyed, it is calculate by the following formula and seal chamber is leaked by connection chamber
Gas in atmospheric pressure P0Under volume QIt is close, connection:
The slip V leaked at this time from connection chamber to seal chambertIt is calculate by the following formula:
At this time from connection chamber and the pressure differential leakance rate V that is leaked from coupling chamber to seal chamber caused by the pressure difference of seal chambertpIt is logical
Cross following formula calculating:
Pressure differential leakance rate VtpIt can be used as the pressure differential leakance rate between connection chamber and seal chamber under existing assembly relation,
The pressure differential leakance rate is believed that invariable within the scope of the numerical space of very little under working condition, if the dwell time product will be taken
Timesharing can observe the situation of change of connection chamber and seal chamber pressure differential leakance rate in the seal chamber dwell time, if variation too greatly and
The variation can not be ignored, then illustrate that seal chamber leakproofness is not able to satisfy job requirement, installation is incorrect, needs return step 2
Reinstall seal chamber.
Preferably, judging P in step 3.2Close, surveyWith PClose, reasonIt is whether equal, it needs to be set in advance according to air-leakage test precision
Fixed number value mobility scale, works as PClose, surveyWith PClose, reasonBetween difference be less than the setting value and both then think equal, otherwise it is assumed that the two is not
It is equal；Seal chamber needs pressure maintaining T for a period of time in step 3.3It is close, the length of the dwell time need to require give in advance according to product testing
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 given variation section in advance be required according to product testing, when the change of pressure differential leakance rate
The limit D-value of change is greater than the given section that changes and then thinks that variation is too big, otherwise it is assumed that pressure differential leakance rate is constant.
Preferably, measuring whether connection chamber vacuum pressure and its theoretical value at this time are unanimously to judge at this time described in step 4
Couple chamber and surveys vacuum pressure PConnection is surveyedWith theoretical vacuum pressure PConnection, reasonBetween difference whether be less than specified value, which needs root
It is previously set according to working condition；PConnection, reasonIt is calculated by following formula:
Wherein, QVeryFor vacuum chamber volume, QConnectionFor the volume for coupling chamber, PVery, precedingConnection chamber to measure vacuumizes initial vacuum chamber
Vacuum pressure, PConnection is surveyedThe 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 in connection chamber described in step 5, which changes too fast,
Change rate to compare with value is previously set, thinks to change too fast, the setting if vacuum pressure rate of change is greater than the value
Value is previously set according to working condition.
Preferably, T described in step 6It surveysLength of time presets determination according to reality of work.
Preferably, coupling chamber, sealing during monitoring this by reading the vacuum meter being connected with two chambers and reading described in step 6
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 is as follows:
Vacuum degree pressure value P when vacuum state is stablized in the connection chamber read according to step 5Join, is steady, stand TIt surveysJoin after time
Meet the vacuum pressure P measured in chamberConnection, after, the gas leaked into connection chamber is calculated in atmospheric pressure P0Under volume QConnection is surveyedFor
Wherein, QConnectionFor the volume for coupling chamber；
According to the pressure differential leakance rate V leaked between connection chamber and seal chambertpAnd stand TIt surveysVacuum pressure in seal chamber after time
PIt is close, afterIt calculates during standing from seal chamber to connection chamber leaked gas in atmospheric pressure P0Under volume QClose Xiang LianFor
QClose Xiang Lian=(PIt is close, after-PJoin, is steady)·Vtp·TIt surveys,
If calculated result QClose Xiang Lian<0m3, then illustrate that gas is leaked from connection chamber to seal chamber；
The gas in connection chamber is leaked into atmospheric pressure P by product testing position during standing0Under gas volume QProduct
For
QProduct=QConnection is surveyed-QClose Xiang Lian；
Released gas rate VProductFor
Air-leakage test standard is artificially determined in advance according to working condition, by above-mentioned calculated result QProductAnd VProductWith air-tightness
Examination criteria comparison carries out that products air tightness is qualified or not and the judgement of airtight quality.
Beneficial effect
The prior art is compared, the partially sealed outer surface air-tightness detection method of product of the invention is able to carry out various detections
Product integrality (air-tightness) detection under operating condition, from this method known to obtained characteristic especially suitable for the complete of certain volume
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.
Detailed description of the invention
Fig. 1 is basic principle schematic of the invention.
Fig. 2 is to couple the variation tendency schematic diagram of intracavitary vacuum pressure in the detection process in Fig. 1.
Fig. 3 is air tight test process in Fig. 1 method.
Fig. 4 be Fig. 1 method in seal chamber verification with seal chamber, couple pressure differential leakance rate calculation process between chamber.
Appended drawing reference: A- preparation stage, B- vacuumizing phase, C- vacuum stabilization sub stage, D- vacuum are kept for the stage, and E- is broken true
The empty stage.
Specific embodiment
The preferred embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment 1:
As shown in Figure 1, the object of the method for the present invention operation includes connection chamber, vacuum chamber, seal chamber, vacuum pump, couple chamber
For coupling product detected part and constructing closed detected space jointly with detected part, vacuum chamber is for building air-tightness inspection
Vacuum environment needed for survey process, seal chamber are used to detect the sealing effect of connection chamber, be connection chamber when vacuum pump is for work,
Vacuum chamber, seal chamber provide vacuum environment；Vacuum pump is connect by vacuum tube with vacuum chamber, vacuum chamber pass through vacuum tube respectively with
Seal chamber, connection chamber connection；Distinguish with vacuum chamber, vacuum chamber with seal chamber, vacuum chamber with the junction for coupling chamber in vacuum pump
By setting vacuum valve control piper on-off to provide working environment to couple chamber and seal chamber；Seal chamber is connected and is socketed
Couple chamber；When work, seal chamber is installed along with product testing position with chamber is coupled, and collectively forms two sets with position to be detected
The closed cavity connect ensures the leakproofness of interface by placing sealing rubber ring at seal chamber, connection chamber and product testing position；
Vacuum chamber, seal chamber, connection chamber vacuum meter is respectively set, by measurement vacuum chamber, seal chamber, couple chamber vacuum pressure and its
The case where changing over time, the air-tightness for calculating and examining product partially sealed.
The working environment is built by following processes: then the limiting value of vacuum degree first in predetermined vacuum chamber passes through
It start and stop vacuum pump and cut-offs vacuum valve between vacuum chamber and vacuum pump and keeps the vacuum degree in vacuum chamber in the pole of vacuum chamber
Between limit value, i.e. the vacuum pressure of holding vacuum chamber is PVery, preceding；The vacuum environment of seal chamber and connection chamber is by on-off vacuum
Room and seal chamber, couple the vacuum valve between chamber realize vacuum chamber respectively with seal chamber, couple moment of vacuum state in chamber
What balance was completed, according to vacuum level requirements design vacuum chamber and seal chamber needed for seal chamber when working condition and connection chamber,
Couple the proportionate relationship of cavity space.
Coupling chamber, seal chamber, vacuum chamber in the present embodiment all uses A3 steel to be made, and vacuum chamber is the envelope with certain space
Close structure, connection chamber, the box like structure that seal chamber is the same end opening with certain space, open end edge shape with it is to be checked
It surveys position to mediate completely, when detection, connection chamber is completely covered detection position and forms detection space, sealing with product testing position
Chamber is formed by space package connection chamber in conjunction with the outer of product testing position and pastes to detect connection chamber and product testing position
Close the detection space formed；Preferably, the connection of the two and vacuum chamber uses detachable mode, convenient for being advised according to different product
Lattice are using dedicated seal chamber and connection chamber.Certainly, chamber is coupled in this example, seal chamber uses box-like structure, actually detected process
In, it is without being limited thereto, seal chamber can be designed according to requirement of engineering, coupled cavity configuration and realized seal chamber, connection chamber and vacuum chamber
Quick connection.In this example, the volume of vacuum chamber is QVery=0.01m3, seal chamber and product testing position form enclosure space and hold
Product is QIt is close=0.002m3, connection chamber and product testing position form enclosure space volume as QConnection=0.002m3.Vacuum meter is all selected
CTR100N type diagram vacuum gauge, vacuum valve all select U.S.'s Nai Laisi 616G-P-11-2240TT type electric controlled vacuum valve, very
Sky pump selects German Lay treasured D16C type vacuum pump.
As shown in Fig. 2, coupling the vacuum pressure in chamber in the partially sealed air-leakage test of execution this method progress product
It experienced five stages, 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 executes, is as follows:
Step 1: whether the instrument that detection executes this method is in running order, including whether detects 3 vacuum meter signals
Normally, whether 3 vacuum valves are in energization and off state, and whether vacuum pump work is normal, open vacuum pump and vacuum chamber
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: seal chamber is mounted on product testing position, seal chamber, connection chamber and product testing position with chamber is coupled
Outer surface is bonded completely and connection chamber is made to cover detection position completely；Open the valve of connection pipeline between vacuum pump and vacuum chamber
Vacuum chamber is vacuumized, the vacuum meter of vacuum chamber is observed, after measuring vacuum pressure in vacuum chamber and stablizing after close the valve
And vacuum pump；
Step 3: opening the vacuum valve between vacuum chamber and seal chamber penetrates through vacuum chamber and seal chamber, gas in seal chamber
Body pressure moment and vacuum cavity pressure reach balance, and the vacuum valve being then powered off between vacuum chamber and seal chamber passes through reading
Take whether vacuum pressure in the vacuum meter being connected with seal chamber reading observation seal chamber changes, if vacuum pressure becomes in seal chamber
Change and obviously then illustrate that seal chamber working condition is abnormal, remove seal chamber with couple chamber return step 2；
Seal chamber working condition is verified, seal chamber is calculated and couples the pressure differential leakance rate between chamber, as shown in figure 4, step
It is as follows:
Step 3.1: measuring the vacuum pressure P of connection chamberJoin, is precedingWith seal chamber vacuum pressure PIt is close, precedingIt is all atmospheric pressure P0, i.e.,
0.1MPa；
Step 3.2: opening the vacuum valve between vacuum chamber and seal chamber, reach seal chamber moment and balanced with vacuum chamber
Vacuum degree and keep stable, measure opening vacuum valve initial vacuum chamber vacuum pressure PVery, preceding=0.01MPa is calculated and is stablized
Vacuum pressure P in seal chamber under stateClose, reasonTheoretical value be
Seal chamber vacuum pressure measured value P at this timeClose, survey=0.0254MPa, because of (PClose, survey-PClose, reason)/PClose, reason=0.04 < 5%,
So seal chamber 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 knows that seal chamber work is abnormal, needs return step 2 to adjust seal chamber and reinstalls；
It is well known that absolute sealing and the absolute of vacuum meter measurement are accurately impossible, therefore seal chamber is true
Empty pressure measuring value can not be absolutely 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, P is worked asClose, surveyWith PClose, reasonBetween difference be less than the setting value and both then think equal, otherwise it is assumed that
The two is unequal；P is worked as in setting in the present embodimentClose, surveyWith PIt is close、ReasonBetween difference be lower than PClose, reason5% when, it is believed that the two is equal；When
So, one skilled in the art will appreciate that different values can be set according to different application scenarios.
Step 3.3: closing vacuum valve, seal chamber pressure maintaining T for a period of timeIt is close(5 minutes) vacuum degree is no longer in seal chamber afterwards
Variation, then measures seal chamber vacuum pressure PIt is close, after=0.0254MPa is leaked at this time into the gas in seal chamber in atmospheric pressure P0
Under volume QIt is close, afterFor
According to the vacuum pressure P in the connection chamber measured at this timeConnection is surveyed=0.1MPa, can calculate leaked 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 seal chambertFor
Couple pressure differential leakance rate V caused by pressure difference between chamber and seal chamber 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 practical test product thousand is poor
Ten thousand are not, and measurement request is not quite similar, and vacuum chamber, connection chamber, the volume of seal chamber 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 being unsatisfactory for requiring by tooling during capable of observing herein
Seal chamber check out, i.e., pressure difference variation too greatly.
In the present embodiment, according to the V that is calculated of observationtpIt is 0, during actual measurement, this value not necessarily 0 can also
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 variation is greater than the given section that changes and then thinks that variation is too big, otherwise it is assumed that pressure differential leakance rate is constant.
Step 4: opening vacuum chamber penetrates through vacuum chamber with chamber is coupled with the vacuum valve coupled between chamber, couples intracavitary gas
Body pressure and the transient equilibrium of vacuum cavity pressure couple whether chamber vacuum pressure unanimously judges with its theoretical value by measurement at this time
Couple it is intracavitary whether form vacuum environment needed for work, if it is judged that then being torn open for vacuum environment needed for not formed work
Lower seal chamber with couple chamber, return step 2；
Open vacuum chamber makes connection chamber be evacuated to work requirements with the vacuum valve coupled between chamber, and connection chamber vacuumizes
Theoretical vacuum pressure P when to work requirementsConnection, reasonFor
Connection chamber surveys vacuum pressure P at this timeConnection is surveyed=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: shutdown vacuum chamber with couple the vacuum valve between chamber, wait intracavitary vacuum state to be coupled to stablizing shape
State, it is too fast whether the intracavitary vacuum pressure of vacuum meter reading observation connection being connected by reading with connection chamber changes, if coupled
Vacuum pressure variation in chamber is too fast, illustrates that the leakage of product testing position is serious or couples chamber operation irregularity, removes seal chamber
With couple chamber return step 2 after execute this process again, illustrate product if the vacuum degree decline in connection chamber is still too fast
Detection position leakage is serious, terminates detection process；
The surveyed vacuum pressure value P of vacuum meter in connection chamber is observed in the present embodiment, during thisJoin, is steady=
0.026MPa, because of PJoin, is steady-PConnection is surveyed=0, so connection chamber working condition is normal.
Same as above, it is impossible for being absolutely sealed, therefore it is too fast to judge whether the vacuum pressure in connection chamber changes
It should be compared with value is previously set, just think to change higher than the value too fast；Otherwise, it is believed that there is no variation, connections
Chamber is working properly.
Step 6: connection chamber, seal chamber keep vacuum state and stand a period of time TIt surveys(5 minutes) are afterwards by reading and two
The connected vacuum meter reading of chamber couples the vacuum pressure situation of change of chamber, seal chamber 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 leak into connection chamber
Gas is in atmospheric pressure P0Under volume be
According to the pressure differential leakance rate V leaked between connection chamber and seal chambertpAnd vacuum pressure P in seal chamberIt is close, after, stand process
In from seal chamber to connection chamber leaked gas in atmospheric pressure P0Under volume QClose Xiang LianFor
QClose Xiang Lian=(PIt is close, after-PJoin, is steady)·Vtp·TIt surveys=0m3；
During standing, the gas in connection chamber is leaked into atmospheric pressure P by detection position sealing by product cavity0
Under gas volume QProductFor
QProduct=QConnection is surveyed-QClose Xiang Lian=0m3,
Released gas rate VProductFor
Because of QProductLess than 5% and released gas rate V of product cavity volumeProductFor 0m3/ min determines 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 seal chamber and removing, terminate this time to detect, wait next airtightness measurement.
Above-described specific descriptions have carried out further specifically the purpose of invention, technical scheme and beneficial effects
It is bright, it should be understood that the above is only a specific embodiment of the present invention, the protection model being not intended to limit the present invention
It encloses, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope.
Claims (10)
1. 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 connection
Chamber, vacuum chamber, seal chamber, vacuum pump are connect, connection chamber is for coupling product testing position and constructing jointly with product testing position
Closed detected space, vacuum chamber is for vacuum environment needed for building air-leakage test process, and seal chamber is for detecting connection
The sealing effect of chamber provides vacuum environment when vacuum pump is used for work for connection chamber, vacuum chamber, seal chamber；Vacuum pump passes through true
Blank pipe is connect with vacuum chamber, and vacuum chamber is connect with seal chamber, connection chamber respectively by vacuum tube；In vacuum pump and vacuum chamber, true
Cavity passes through setting vacuum valve control piper on-off respectively with seal chamber, vacuum chamber with the junction for coupling chamber to be connection
Chamber and seal chamber provide working environment；Seal chamber is connected and is socketed connection chamber；When work, seal chamber is installed along with chamber is coupled
Product testing position collectively forms the closed cavity of two sockets with product testing position, by seal chamber, connection chamber and production
Product detection position, which places sealing rubber ring, ensures the leakproofness of interface；Vacuum meter is respectively set in vacuum chamber, seal chamber, connection chamber,
The case where by measurement vacuum chamber, seal chamber, the vacuum pressure for coupling chamber and its changing over time calculates and examines product local
The air-tightness of sealing；
Specifically includes the following steps:
Step 1: whether the instrument that detection executes this method is in running order, i.e., whether vacuum meter signal normal, vacuum valve
It is whether normal with vacuum pump work；
Step 2: at product testing position installation seal chamber with couple chamber and ensures the leakproofness of interface, open vacuum pump with very
The valve of connection pipeline vacuumizes vacuum chamber between cavity, observes the vacuum meter of vacuum chamber, meets work when measuring vacuum chamber
It is required that vacuum degree after close the valve and vacuum pump；
Step 3: opening the vacuum valve between vacuum chamber and seal chamber penetrates through vacuum chamber and seal chamber, seals intracavity gas pressure
Power moment and vacuum cavity pressure reach balance, the vacuum valve being then powered off between vacuum chamber and seal chamber, by reading and
Whether vacuum pressure changes in the connected vacuum meter reading observation seal chamber of seal chamber, if vacuum pressure variation is bright in seal chamber
It is aobvious then illustrate that seal chamber working condition is abnormal, remove seal chamber with couple chamber return step 2；
Step 4: opening vacuum chamber penetrates through vacuum chamber with chamber is coupled with the vacuum valve coupled between chamber, couples intracavity gas pressure
Power and the transient equilibrium of vacuum cavity pressure, by measurement, unanimously whether judgement couples connection chamber vacuum pressure with its theoretical value at this time
It is intracavitary whether to form vacuum environment needed for work, if it is judged that then being removed close for vacuum environment needed for not formed work
Envelope chamber with couple chamber, return step 2；
Step 5: shutdown vacuum chamber with couple the vacuum valve between chamber, pass through to read and read sight with the vacuum meter that is connected of connection chamber
It is too fast whether the intracavitary vacuum pressure of survey connection changes, and illustrates product testing portion if the vacuum pressure variation in connection chamber is too fast
Position leakage is serious or connection chamber operation irregularity, remove seal chamber with couple chamber return step 2 after execute this process again, if
The vacuum degree decline coupled in chamber is still too fast, illustrates that the leakage of product testing position is serious, terminates detection process；
Step 6: connection chamber, seal chamber keep vacuum state and stand a period of time TIt surveys, by reading the vacuum being connected with two chambers
Meter reading couples the vacuum pressure situation of change of chamber, seal chamber during monitoring this, and according to the vacuum pressure situation of change of two chambers
Judge the air-tightness and airtight quality of the sealing at product testing position；
Step 7: connection cavity, seal chamber release being removed, detection process is terminated.
2. the partially sealed outer surface air-tightness detection method of a kind of product according to claim 1, it is characterised in that: described close
Envelope chamber is connected and is socketed connection chamber, and the two the same end is 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, seal chamber, connection chamber common open end and product testing position outer surface are tied
Merge sealing；Connection chamber is completely covered product testing position and forms detection space, seal chamber and product with product testing position
The combination of detection position outer is formed by space package connection chamber and is bonded to form inspection with product testing position to detect connection chamber
Survey the leakproofness in space.
3. the partially sealed outer surface air-tightness detection method of a kind of product according to claim 2, it is characterised in that: described close
It is different according to the model of product to seal chamber, connection chamber, specification, shape need to guarantee close according to the customization of product testing position shape
Envelope chamber, connection chamber open end shape and product testing position are mediated completely；The connection of seal chamber, connection chamber and vacuum chamber is removable
It unloads, convenient for using dedicated seal chamber and coupling chamber according to different product specification；Further, it is designed according to requirement of engineering close
Seal chamber, connection cavity configuration, and the quick connection realized seal chamber, couple chamber and vacuum chamber.
4. the partially sealed outer surface air-tightness detection method of a kind of product according to claim 1, it is characterised in that: the work
Make environment to build by following processes: then the limiting value of vacuum degree first in predetermined vacuum chamber passes through start and stop vacuum pump and opens
Vacuum valve between disconnected vacuum chamber and vacuum pump keeps the vacuum degree in vacuum chamber between the limiting value of vacuum chamber, that is, keeps
The vacuum pressure of vacuum chamber is PVery, preceding；Seal chamber and the vacuum environment for coupling chamber are by on-off vacuum chamber and seal chamber, couple
Vacuum valve between chamber realize vacuum chamber respectively with seal chamber, the transient equilibrium completion that couple vacuum state in chamber, according to
When working condition seal chamber and connection chamber needed for vacuum level requirements design vacuum chamber and seal chamber, connection cavity space ratio
Relationship.
5. the partially sealed outer surface air-tightness detection method of a kind 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
It influences, needs " to illustrate that seal chamber working condition is abnormal if vacuum pressure variation in seal chamber is obvious " according to step 3
Seal chamber sealing performance is verified, checking procedure is as follows:
Step 3.1: measuring the vacuum pressure P of vacuum chamberVery, preceding, the vacuum pressure P of measurement connection chamberJoin, is precedingWith the vacuum pressure of seal chamber
Power PIt is close, preceding, the two is equal to atmospheric pressure P at this time0, the volume of vacuum chamber, connection chamber and seal chamber is respectively QVery、QConnection、QIt is close；
Step 3.2: calculating after opening vacuum valve the theoretical value P of vacuum pressure in seal chamber under stable state according to the following formulaClose, reasonFor
The vacuum valve between vacuum chamber and seal chamber is opened, reaches seal chamber moment and the vacuum degree of vacuum chamber balance and guarantor
It is fixed to keep steady, and measures seal chamber vacuum pressure measured value P at this timeClose, surveyIf PClose, surveyWith PClose, reasonIt is equal, think seal chamber leakproofness
It is good, meet job requirement；Otherwise it is assumed that seal chamber installation is incorrect, return step 2 adjusts seal chamber and reinstalls；
Step 3.3: seal chamber pressure maintaining T for a period of timeIt is closeVacuum degree no longer changes in seal chamber afterwards, measures seal chamber vacuum pressure
PIt is close, after, leaked at this time into the gas in seal chamber in atmospheric pressure P0Under volume QIt is close, afterFor
According to the vacuum pressure P in the connection chamber measured at this timeConnection is surveyed, it is calculate by the following formula the gas that seal chamber is leaked by connection chamber
Body is in atmospheric pressure P0Under volume QIt is close, connection:
The slip V leaked at this time from connection chamber to seal chambertIt is calculate by the following formula:
At this time from connection chamber and the pressure differential leakance rate V that is leaked from coupling chamber to seal chamber caused by the pressure difference of seal chambertpUnder
Formula calculates:
Pressure differential leakance rate VtpIt can be used as the pressure differential leakance rate between connection chamber and seal chamber under existing assembly relation, working
The pressure differential leakance rate is believed that invariable within the scope of the numerical space of very little under state, if the dwell time will take integral
It can observe the situation of change of connection chamber and seal chamber pressure differential leakance rate in the seal chamber dwell time, if changing the too big and change
Change can not be ignored, then illustrate that seal chamber leakproofness is not able to satisfy job requirement, installation is incorrect, needs return step 2 again
Seal chamber is installed.
6. the partially sealed outer surface air-tightness detection method of a kind 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 needs to preset numerical value mobility scale according to air-leakage test precision, works as PClose, survey
With PClose, reasonBetween difference be less than the setting value and both then think equal, otherwise it is assumed that the two is unequal；Seal chamber in step 3.3
Need pressure maintaining T for a period of timeIt is close, the length of the dwell time need to be required according to product testing it is given in advance, 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 variation of pressure differential leakance rate is given greater than this
Surely it changes section and then thinks that variation is too big, otherwise it is assumed that pressure differential leakance rate is constant.
7. the partially sealed outer surface air-tightness detection method of a kind 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 is surveyed
With theoretical vacuum pressure PConnection, reasonBetween difference whether be less than specified value, which need to be previously set according to working condition；PConnection, reason
It is calculated by following formula:
Wherein, QVeryFor vacuum chamber volume, QConnectionFor the volume for coupling chamber, PVery, precedingConnection chamber to measure vacuumizes the true of initial vacuum chamber
Pneumatics power, PConnection is surveyedThe vacuum pressure of connection chamber before connection chamber to measure vacuumizes.
8. the partially sealed outer surface air-tightness detection method of a kind of product according to claim 1, it is characterised in that: step 5
It is that by the vacuum pressure rate of change coupled in chamber and value progress is previously set that vacuum pressure in the connection chamber, which changes too fast,
Comparison is thought to change too fast if vacuum pressure rate of change is greater than the value, which is previously set according to working condition.
9. -8 any a kind of partially sealed outer surface air-tightness detection method of product according to claim 1, it is characterised in that:
T described in step 6It surveysLength of time presets determination according to reality of work.
10. the partially sealed outer surface air-tightness detection method of a kind of product according to claim 5, it is characterised in that: step 6
The vacuum pressure situation of change that connection chamber, seal chamber during monitoring this are read by reading the vacuum meter being connected with two chambers,
And the air-tightness and airtight quality of the sealing at product testing position, detailed process are judged according to the vacuum pressure situation of change of two chambers
It is as follows:
Vacuum degree pressure value P when vacuum state is stablized in the connection chamber read according to step 5Join, is steady, stand TIt surveysCouple in chamber after time
The vacuum pressure P measuredConnection, after, the gas leaked into connection chamber is calculated in atmospheric pressure P0Under volume QConnection is surveyedFor
Wherein, QConnectionFor the volume for coupling chamber；
According to the pressure differential leakance rate V leaked between connection chamber and seal chambertpAnd stand TIt surveysVacuum pressure P in seal chamber after timeIt is close, after
It calculates during standing from seal chamber to connection chamber leaked gas in atmospheric pressure P0Under volume QClose Xiang LianFor
QClose Xiang Lian=(PJoin, is steady-PIt is close, after)·Vtp·TIt surveys,
If calculated result QClose Xiang Lian<0m3, then illustrate that gas is leaked from connection chamber to seal chamber；
The gas in connection chamber is leaked into atmospheric pressure P by product testing position during standing0Under gas volume QProductFor
QProduct=QConnection is surveyed-QClose Xiang Lian；
Released gas rate VProductFor
Air-leakage test standard is artificially determined in advance according to working condition, by above-mentioned calculated result 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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| CN109186877B (en) * | 2018-08-06 | 2020-06-09 | 深圳市卓誉自动化科技有限公司 | Battery air tightness detection process |
| CN117782475A (en) * | 2020-11-30 | 2024-03-29 | 北京舍得叔叔科技有限公司 | Method and device for quantitatively monitoring airtight space air tightness by utilizing atmospheric pressure change |
| CN115494338B (en) * | 2022-11-08 | 2023-04-07 | 荣耀终端有限公司 | Detection method and detection device |
| CN117091772A (en) * | 2023-10-17 | 2023-11-21 | 宁德时代新能源科技股份有限公司 | Air tightness detection method and air tightness detection system |
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