CN104135706B - Direct press type airtight detecting apparatus - Google Patents

Direct press type airtight detecting apparatus Download PDF

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Publication number
CN104135706B
CN104135706B CN201410375113.XA CN201410375113A CN104135706B CN 104135706 B CN104135706 B CN 104135706B CN 201410375113 A CN201410375113 A CN 201410375113A CN 104135706 B CN104135706 B CN 104135706B
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China
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pressure
value
baroceptor
detection
embedded
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CN201410375113.XA
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Chinese (zh)
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CN104135706A (en
Inventor
陈军生
吴海雯
马琼儒
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歌尔股份有限公司
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Priority to CN201410375113.XA priority Critical patent/CN104135706B/en
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Publication of CN104135706B publication Critical patent/CN104135706B/en

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Abstract

The invention discloses a kind of direct press type airtight detecting apparatus, including:High pressure filter;The pressure regulator valve being connected with the high pressure filter gas circuit;The charge valve being connected with the pressure regulator valve gas circuit;The gas tank being connected with the charge valve gas circuit, the gas tank is internally provided with baroceptor, and the gas tank can gas circuit be connected to tested product;The air bleeding valve being connected with the gas tank gas circuit;Embedded system, is electrically connected with the charge valve, the baroceptor and the air bleeding valve respectively;Wherein, the baroceptor sends the pressure value collected to the embedded system;And, the embedded system includes being used in aeration phase, when detecting the pressure value that the baroceptor collects and reaching the blowing pressure threshold value of setting, the ventilating control module of the control shut-off charge valve.Correspondingly, the invention also discloses a kind of airtight detection method.Using the present invention, the accuracy of airtight detection can be improved.

Description

Direct press type airtight detecting apparatus
Technical field
The present invention relates to air-leakage test technical field, more particularly, to a kind of direct press type airtight detecting apparatus and The method that airtight detection is carried out using the detection device.
Background technology
Existing air tightness detection equipment generally includes differential pressure type airtight detecting apparatus and direct press type airtight detecting apparatus.Differential pressure Formula airtight detecting apparatus general structure is complicated.And direct press type airtight detecting apparatus, such as patent of application number 201120338784.0 are literary Disclosed technical scheme is offered, it includes high pressure filter, precise pressure regulating valve is connected with high pressure filter, electronic pressure gage and precision Pressure regulator valve connection, external pilot 3 position-5 way magnetic valve are connected with precise pressure regulating valve and electronic pressure gage respectively, magnetic valve and height Accuracy pressure sensor is connected to tested product.In work, precise pressure regulating valve is the tested product the blowing pressure according to setting to inflation Gas pressure regulation, electronic pressure gage measures the gas pressure after accurate voltage regulating valve regulation, this precise pressure regulating valve and electron pressure Table combination is complicated to provide the mode of the blowing pressure, and when tested product are changed and need to change test pressure, it is necessary to manually Adjustment precision pressure regulator valve.It can not be repaired automatically in addition, precise pressure regulating valve is used for a long time as occurred deviation, can only be according to electron pressure Table recovers manually.
In the prior art, gas leakage detection and gas permeability detection are respectively adopted single equipment and carried out.Existing gas leakage detection Equipment is small due to range, can only detect the gas leakage of tested product, it is impossible to the gas permeability of the tested product of detection;And gas permeability detection Equipment is also difficult to complete the gas leakage detection using small pressure change as index.
Moreover, the existing accurate measurement gas tank air pressure inside of air tightness detection equipment requirement, and gas tank internal volume is required, When causing design gas tank and sensor installation, gas tank is often designed to two lid formulas, is twisted two lids by encapsulant and screw Together.This mode cost is high, there is the risk from gas leakage between Liang Gai, and require high to process materials;And sensing Device is put into inside gas tank, in maintenance maintenance, it is necessary to be taken apart to gas tank, and workload is big, technical difficulty is high.But sensor is installed Outside gas tank and when being connected by gas circuit with gas tank, due to adding gas circuit so that sensor is tiny logical with having inside gas tank Road, causes air pressure inside stabilization time long.
The content of the invention
For above-mentioned technical problem, there is provided one kind is simple in construction, easy to operate and airtight according to an aspect of the present invention The high direct press type airtight detecting apparatus of detection accuracy.
A kind of direct press type airtight detecting apparatus provided in an embodiment of the present invention, including:
High pressure filter;
The pressure regulator valve being connected with the high pressure filter gas circuit;
The charge valve being connected with the pressure regulator valve gas circuit;
The gas tank being connected with the charge valve gas circuit, the gas tank is internally provided with baroceptor, and the gas tank Can gas circuit be connected to tested product;
The air bleeding valve being connected with the gas tank gas circuit;
Embedded system, is electrically connected with the charge valve, the baroceptor and the air bleeding valve respectively;
Wherein, the baroceptor sends the pressure value collected to the embedded system;And, the insertion Formula system includes being used in aeration phase, when the inflation pressure for detecting the pressure value that the baroceptor collects and reaching setting During force threshold, control turns off the charge valve so that the embedded system is in follow-up equilibrium stage and/or detection-phase energy Enough ventilating control modules for performing corresponding airtight detection.
Alternatively, the detection device also includes:It is arranged on the first speed governing between the pressure regulator valve and the charge valve Device, first speed regulator is connected with the pressure regulator valve and the charge valve gas circuit respectively;And/or, be arranged on the gas tank and The second speed regulator between the air bleeding valve, second speed regulator is connected with the gas tank and the air bleeding valve gas circuit respectively.
Alternatively, the embedded system also includes:For in equilibrium stage, detecting what the baroceptor was collected Pressure value relative to first reference value change value of pressure whether exceed setting balance detection threshold value, if be detected as be, Judge the big gas leakage of tested product, and control to open the balance detection module of the air bleeding valve;
Wherein, the pressure value that the baroceptor is collected at the end of the first reference value is the aeration phase.
Alternatively, the embedded system also includes:For under gas leakage detection pattern, detecting that the baroceptor is adopted Whether the pressure value collected exceedes the gas leakage detection threshold value of setting relative to the change value of pressure of the second a reference value;If be detected as It is then to judge the tested product gas leakage, and controls to open the air bleeding valve;If being detected as no, judge that the tested product are closed The gas leakage detection module of lattice;
Wherein, the pressure value that the baroceptor is collected at the end of second a reference value is the equilibrium stage.
Alternatively, the embedded system also includes the ventilative detection module for being used to realize following functions:In ventilative detection Under pattern, detect whether the pressure value that the baroceptor is collected is setting relative to the change value of pressure of the second a reference value The first ventilative detection threshold value and setting the second ventilative detection threshold value between, wherein, second a reference value is the balance The pressure value that the baroceptor is collected at the end of stage, and the described second ventilative detection threshold value is saturating more than described first Gas detection threshold value;If being detected as the change value of pressure less than the described first ventilative detection threshold value, the tested product are judged Exception is not leaked, and controls to open the air bleeding valve;If being detected as the change value of pressure more than the described second ventilative detection threshold Value, then judge that the tested product superleak is abnormal, and control to open the air bleeding valve;If being detected as the change value of pressure in institute State between the first ventilative detection threshold value and the second ventilative detection threshold value, then judge that the tested product are qualified.
Alternatively, the embedded system also includes compensating module, is inflated for obtaining the baroceptor in top n The N number of the blowing pressure value collected at the end of stage;The baroceptor is obtained to collect at the end of top n equilibrium stage N number of balance pressure value;And, pressure supplement Δ P is calculated according to below equation:
Wherein, Pfill(i) the blowing pressure value at the end of i-th of aeration phase, P are representedbal(i) i-th balance is represented Balance pressure value at the end of stage, 1≤i≤N, N is any integer value;
The ventilating control module is additionally operable to be determined newly according to the pressure supplement and the blowing pressure threshold value of storage The blowing pressure threshold value:Pnewth=Poldth- Δ P, wherein, PoldthFor the blowing pressure threshold value initially set.
According to another aspect of the present invention, additionally provide and a kind of carry out airtight detection using direct press type airtight detecting apparatus Method, institute's direct press type airtight detecting apparatus includes high pressure filter;The pressure regulator valve being connected with the high pressure filter gas circuit;With institute State the charge valve of pressure regulator valve gas circuit connection;The gas tank being connected with the charge valve gas circuit, the gas tank is internally provided with air pressure transmission Sensor, and the gas tank can gas circuit be connected to tested product;The air bleeding valve being connected with the gas tank gas circuit;And embedded system System, is electrically connected with the charge valve, the baroceptor and the air bleeding valve respectively;The baroceptor will be collected Pressure value inside the gas tank sends the embedded system to;
Methods described includes:In aeration phase, the embedded system is detecting what the baroceptor was collected When pressure value reaches the blowing pressure threshold value of setting, the control shut-off charge valve, so that the embedded system is follow-up Equilibrium stage and/or detection-phase are able to carry out corresponding airtight detection.
Alternatively, the direct press type detection device also includes:It is arranged between the pressure regulator valve and the charge valve One speed regulator, first speed regulator is connected with the pressure regulator valve and the charge valve gas circuit respectively;And/or, it is arranged on described The second speed regulator between gas tank and the air bleeding valve, second speed regulator respectively with the gas tank and the air bleeding valve gas circuit Connection.
Alternatively, methods described also includes:In equilibrium stage, the embedded system detects the baroceptor collection Whether the pressure value arrived exceedes the balance detection threshold value of setting relative to the change value of pressure of first reference value, if be detected as It is then to judge the big gas leakage of tested product, and controls to open the air bleeding valve;Wherein, the first reference value is the inflation The pressure value that the baroceptor is collected at the end of stage.
Alternatively, methods described also includes:Under gas leakage detection pattern, the embedded system detects the air pressure sensing Whether the pressure value that device is collected exceedes the gas leakage detection threshold value of setting relative to the change value of pressure of the second a reference value;If inspection It is yes to survey, then judges the tested product gas leakage, and control to open the air bleeding valve;If being detected as no, judge described tested Product are qualified;Wherein, the pressure value that the baroceptor is collected at the end of second a reference value is the equilibrium stage.
Alternatively, methods described also includes:Under ventilative detection pattern, the embedded detecting system detects the air pressure The pressure value that sensor is collected relative to the second a reference value change value of pressure whether setting first breathe freely detection threshold value Between the second ventilative detection threshold value of setting, wherein, second a reference value is the air pressure at the end of the equilibrium stage The pressure value that sensor is collected, also, the described second ventilative detection threshold value is more than the described first ventilative detection threshold value;
If being detected as the change value of pressure less than the described first ventilative detection threshold value, judge that the tested product do not leak It is abnormal, and control to open the air bleeding valve;
If being detected as the change value of pressure more than the described second ventilative detection threshold value, the tested product superleak is judged It is abnormal, and control to open the air bleeding valve;
If being detected as the change value of pressure in the described first ventilative detection threshold value and the second ventilative detection threshold value Between, then judge that the tested product are qualified;
The pressure value that second a reference value collects for the baroceptor at the end of the equilibrium stage.
Alternatively, methods described also includes:
The embedded system determines the pressure supplement of aeration phase, including:The baroceptor is obtained in top n The N number of the blowing pressure value collected at the end of aeration phase;The baroceptor is obtained to adopt at the end of top n equilibrium stage The N number of balance pressure value collected;And, pressure supplement Δ P is calculated according to below equation:
Wherein, Pfill(i) the blowing pressure value at the end of i-th of aeration phase, P are representedbal(i) i-th balance is represented Balance pressure value at the end of stage, 1≤i≤N, N is any integer value;And,
The embedded system determines new the blowing pressure according to the blowing pressure threshold value of the pressure supplement and storage Threshold value:Pnewth=Poldth- Δ P, wherein, PoldthFor the blowing pressure threshold value initially set.
The present invention eliminates the electronic pressure gage of bleed pressure value of the measurement after pressure regulator valve, knot compared to prior art Structure is simple;And using embedded system and set the baroceptor inside gas tank to precisely control the inflation of gas tank Process.In addition, using embedded system, pressure threshold can be conveniently set up, therefore when tested product are changed, reset pressure Force threshold, it is simple to operate, without manual regulation pressure regulator valve.In addition, being microphone sound film or loudspeaker for tested product It is minimum using the internal volume of gas tank in the airtight detecting apparatus due to detecting this kind of product air-tightness with products such as sound films, to fill Enter accurate pressure to be not easy to, and its error to air pressure is extremely sensitive.Therefore, the gas replenishment process of accurate control gas tank can Greatly improve the accuracy of follow-up airtight detection.
Brief description of the drawings
Fig. 1 is the principle schematic of the airtight detecting apparatus according to an embodiment.
Fig. 2 is the structural representation of the gas tank embodiment in the airtight detecting apparatus in Fig. 1.
Fig. 3 is the structural schematic block diagram of an embodiment of the embedded system in airtight detecting apparatus.
Fig. 4 is the structural schematic block diagram of another embodiment of the embedded system in airtight detecting apparatus.
Fig. 5 is the method flow signal that airtight detection is carried out according to use Fig. 1 of embodiment airtight detecting apparatus Figure.
Fig. 6 is that the method flow for carrying out airtight detection according to use Fig. 1 of another embodiment airtight detecting apparatus shows It is intended to.
Embodiment
Embodiment of the present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the principle schematic of airtight detecting apparatus according to an embodiment of the present invention.As shown in Fig. 1, filter 1 gas circuit is connected to pressure regulator valve 2, and the gas circuit of pressure regulator valve 2 is connected to the first speed regulator 3, and the gas circuit of the first speed regulator 3 is connected to charge valve 4, The gas circuit of charge valve 4 is connected to gas tank 7, and the gas circuit of gas tank 7 is connected to tested product.Baroceptor 8 is arranged on inside gas tank 7, to adopt Air pressure inside air collector.Gas tank 7 is also connected with the gas circuit of the second speed regulator 5, and the second speed regulator 5 is connected with the gas circuit of air bleeding valve 6, row Air valve 6 is connected with the exhaust outlet gas circuit of airtight detecting apparatus.Baroceptor 8 is electrically connected with embedded system 9, alternatively, gas Pressure sensor 8 can for example be electrically connected by wire with embedded system 9, embedded system 9 also with charge valve 4 and exhaust Valve 6 is electrically connected.Embedded system is settable external interface, to access automation equipment and PC.Embedded system may include Keyboard, LCD MODULE and control circuit.
After tested product are accessed, in aeration phase, air bleeding valve 6 is closed, and charge valve starts inflation.Specifically, air pressure Source enters pressure regulator valve 2 and pneumatic supply is transferred into suitable pressure value after high pressure filter 1.Source of the gas after pressure regulation passes through One speed regulator 3 arrives charge valve 4, then arrives gas tank 7 through charge valve 4.Embedded system 9 constantly reads gas by baroceptor Pressure value inside tank 7, when the air pressure inside gas tank 7 reaches the pressure threshold of setting, control shut-off charge valve stops filling Gas.As shown in figure 3, embedded system includes ventilating control module 92, in aeration phase, when detecting the air pressure sensing When the pressure value that device is collected reaches the blowing pressure threshold value of setting, the control shut-off charge valve.So, embedded system exists The follow-up executable corresponding airtight detection of equilibrium stage and/or detection-phase is so as to detect the air-tightness of tested product.For example, flat The weighing apparatus stage determines tested product with the presence or absence of leakage according to the air pressure change of gas tank with the parameter pre-set;Or, in detection rank Section determines tested product with the presence or absence of leakage according to the air pressure change of gas tank with the parameter pre-set.
The airtight detecting apparatus of the present invention eliminates bleed pressure value of the measurement after pressure regulator valve compared to prior art Electronic pressure gage, and using embedded system and set the baroceptor inside gas tank to precisely control gas tank Gas replenishment process.In addition, pressure threshold can be conveniently set up using embedded system, therefore when tested product are changed, set again Pressure threshold is put, without manual regulation pressure regulator valve.It is the product such as microphone sound film or loudspeaker sound film for tested product, uses It is minimum using the internal volume of gas tank in the airtight detecting apparatus of detection this kind of product air-tightness, to be filled with accurate pressure not Easily, and its error to air pressure is extremely sensitive.Therefore, the gas replenishment process of accurate control gas tank is greatly improved airtight detection The detection performance of equipment.
Show that the first speed regulator 3 that gas circuit is connected between pressure regulator valve 2 and charge valve 4 and gas circuit are connected in Fig. 1 The second speed regulator 5 between gas tank 7 and air bleeding valve 6.However, skilled artisans appreciate that in some implementations of the present invention In mode, the first speed regulator 3 and/or the second speed regulator 5 can be omitted.The mesh of the first speed regulator 3 is connected before charge valve 4 Be reduction aeration speed, so as to extend inflationtime.This is due to the internal volume very little of gas tank, and proper extension inflationtime can To allow the control of embedded system the air pressure inside gas tank is more accurately reached predetermined pressure value.Due to inflation the degree of accuracy with Contradiction between aeration speed, existing technology is using first fast aeration, needed for will reaching during pressure, closes fast aeration, The mode inflated at a slow speed is to improve the inflation degree of accuracy, but existing this mode is complicated, cost is high.For exhaust, Certain percussion can be had to tested product by quickly being discharged due to gas, caused tested product to be easily damaged, set before air bleeding valve 6 Exhaust velocity can be reduced by putting the second speed regulator 5, so as to be played a protective role to tested product.
In the present embodiment, equilibrium stage is entered after aeration phase terminates, embedded system 9 also includes balance detection module 94.Balance detection module 94 is when equilibrium stage starts, and the pressure value that baroceptor at the end of aeration phase 8 is collected takes Make first reference value.Balance detection module 94 calculates baroceptor at the end of equilibrium stage also at the end of equilibrium stage Pressure difference value between the pressure value and first reference value that collect;And detect whether the pressure difference value exceedes the balance of setting Detection threshold value, if it is to judge the big gas leakage of tested product to be detected as, control opens air bleeding valve 6 and enters exhaust phase.If balance Detection module 94 detects the balance detection threshold value that pressure difference value is not above setting, then automatically into detection-phase.
According to Product checking demand (such as some Product checking gas leakage, some Product checking gas permeabilities), air pressure detection Equipment enters corresponding detection pattern.
Alternatively, embedded system 9 includes gas leakage detection module 96.Gas leakage detection module 96 under gas leakage detection pattern, The pressure value that baroceptor at the end of equilibrium stage 8 is collected calculates gas in predetermined time period as the second a reference value The pressure difference value of the pressure value that pressure sensor is collected and the second a reference value, and detect whether the pressure difference value exceedes setting Gas leakage detection threshold value, if it is to judge tested product gas leakage to be detected as, control opens air bleeding valve and enters exhaust phase;If It is detected as no, then judges that tested product are qualified.
Alternatively, the embedded system includes ventilative detection module 98.Ventilative detection module 98 is in ventilative detection pattern Under, the pressure value that baroceptor at the end of equilibrium stage 8 is collected is calculated in predetermined time period as the second a reference value The pressure difference value of the pressure value that baroceptor is collected and the second a reference value, and detect the pressure difference value whether in setting The first ventilative detection threshold value A and setting the second ventilative detection threshold value B between.Wherein, the second ventilative detection threshold value is more than the The one ventilative ventilative detection threshold value of detection threshold value, i.e., first is lower limit, and the second ventilative detection threshold value is higher limit.Ventilative detection mould If block 98 is detected as change value of pressure less than the first ventilative detection threshold value, judge that the tested product do not leak exception, and control Air bleeding valve 6 is opened, into exhaust phase.If ventilative detection module 98 is detected as change value of pressure more than the second ventilative detection Threshold value, then judge that tested product superleak is abnormal, and controls to open air bleeding valve 6, into exhaust phase.If ventilative detection module 98 is examined It is that change value of pressure is breathed freely between detection threshold value and the second ventilative detection threshold value first to survey, then judges that tested product are qualified.
The airtight detecting apparatus of the present invention can be not only used for the gas leakage detection of product, it can also be used to the gas permeability inspection of product Survey, use different detection devices respectively compared to gas leakage of the prior art detection and gas permeability detection, can reduce into This.
Fig. 2 shows the structural representation of an embodiment of the gas tank used in the airtight detecting apparatus in Fig. 1.Such as Fig. 2 Shown, gas tank 7 is integral type gas tank, including hollow housing 10, and one end of hollow housing 10 is provided with opening, relative one end The interface 12 of tested product is connected provided with gas circuit.Hollow housing 10 is additionally provided with inflation inlet 14 and exhaust outlet 16.Hollow housing 10 is opened The inner circumferential side wall of mouth is provided with the first threaded area.
The gas tank also includes being provided with the second screw thread on seal nipple 28, at least a portion outer peripheral face of the seal nipple 28 Area, the open interior (screw thread gone out as shown in the reference numeral 24 can be installed to so as at least a portion of seal nipple by screwing Area), wherein the first threaded area and the engagement of the second threaded area.As shown in figure 1, being provided with spiral shell on the outer peripheral face of seal nipple one end Line.Alternatively it is also possible to be to be provided with screw thread on whole outer peripheral faces of seal nipple.
Seal nipple, which is provided with a groove, groove, can fill epoxide resin material 26, in order to ensure seal nipple 28 Sealing, can fill epoxide resin material by the way of embedding.During embedding, some wires for extending through groove are put into 34.Wire 34 can be the wire needed for sensor 32, and it can select simple metal line and avoid contacting with each other or using enamel-cover Line.
Baroceptor 32 is arranged on small-sized or micro-printed circuit board PCB30, and PCB30 can be directly welded at wire On 34.If wire selection is metal or enamel-covered wire with sufficient intensity, directly sensor can be played a supportive role, nothing Need to additionally it fix.
Specifically, in seal nipple 28 after encapsulated epoxy resin material, the PCB30 for being provided with baroceptor 32 is welded It is connected on the wire 34 being arranged in epoxide resin material 26.Then, it is the seal nipple 28 with baroceptor 32 is direct It is screwed on gas tank, that is, completes to install, it is simple in construction, it is easy to operate.Moreover, when carrying out maintenance maintenance, also simply from gas tank On outward winding seal nipple and just may be used.
Alternatively, seal nipple can use commercially available standard pipe seal nipple.As long as will be close inside seal nipple Seal takes down, and just can carry out epoxy resin encapsulated.Due to using standard component, therefore gas tank gas leakage risk diminishes, to technological requirement Reduce, and cost is also reduced.Cost can also further be reduced by carrying out embedding with common epoxide resin material.
It should be noted that the position of the interface 12, inflation inlet 14 and exhaust outlet 16 shown in Fig. 2 is only illustrative, this Art personnel are it will be appreciated that interface 12, inflation inlet 14 and exhaust outlet 16 can also be provided in the other positions of housing 10. Alternatively, inflation inlet and exhaust outlet can be one interfaces of identical, must not necessarily be separately provided.
Inventor also found, can closed using the magnetic valve (such as charge valve and air bleeding valve) in airtight detecting apparatus Moment is acted, the change of existence time and valve internal structure causes gas tank internal pressure to change.Read by baroceptor For setting pressure PthWhen, although charge valve is closed in rapid control, but after stable, air pressure P can deviate the pressure value of setting, partially It is Δ P from amount.
In view of the above-mentioned problems, inventors herein proposing another embodiment of airtight detecting apparatus.In this embodiment, such as Shown in Fig. 4, embedded system is except including ventilating control module 92, balance detection module 94, gas leakage detection module 96 and ventilative Outside detection module 98, in addition to for the compensating module 91 for the atmospheric pressure compensating value for determining aeration phase.
In this embodiment, compensating module 91 is used to realize following functions:Obtain baroceptor and inflate rank in top n The N number of the blowing pressure value collected at the end of section;It is N number of that acquisition baroceptor is collected at the end of preceding N equilibrium stage Balance pressure value;And, pressure supplement Δ P is calculated according to below equation:
Wherein, Pfill(i) the blowing pressure value at the end of i-th of aeration phase, P are representedbal(i) i-th balance is represented Balance pressure value at the end of stage, 1≤i≤N.N value can be any integer value according to design requirement.
Ventilating control module 92 is additionally operable to determine new inflation according to pressure supplement Δ P and storage the blowing pressure threshold value Pressure threshold:Pnewth=Poldth- Δ P, wherein, PoldthFor the blowing pressure threshold value initially set.
So, even if air pressure is at the balance and stability stage, the pressure value of air pressure relative to the stage is filled up at the end of pressure Value can have certain deviation, but due to by compensating the deviation so that the air pressure after stable inside gas tank can reach desired pressure Force value.
The example that airtight detecting apparatus determines atmospheric pressure compensating value is described below in detail.
When airtight detecting apparatus works beginning, first standard qualified products are connected with the gas circuit of gas tank 7.Inflate first, will Atmospheric pressure compensating value Δ P is set to 0, that is, is inflated to air pressure Pfill=PthWhen -0, charge valve is closed in embedded system control.Inflation is finished The pressure value measured after natural stability is Pbal, then offset value calculation be:Δ P=Pbal-Pfill=Pbal-Pth
When being inflated again after gas is emptied, embedded system is detecting pressure for Pth- Δ P time control stops stop inflation. So, the pressure after natural stability is Pth- Δ P+ Δs P=Pth, i.e. the requirement of the setting pressure of tested product can be met.
If for example, it is 11Kpa to stop the pressure after inflation, natural stability when being charged to pressure for 10Kpa, be charged to that next time Pressure stops when being 9Kpa, then the pressure after natural stability is 10Kpa.
The problem of gas tank air pressure deviates setup pressure value after natural stability can be overcome by way of determining offset.And And, because gas tank is in the different tested product of access, actual content product is gas tank+gas circuit+tested product internal volume, it is therefore desirable to filled The internal volume of gas can change with product variations, cause offset Δ P also to change, therefore, it is impossible to which carrying out factory preset puts this Offset.The present invention can set corresponding offset automatically by embedded system according to specific tested product, so as to improve The accuracy of detection.
Alternatively, it is further to obtain more accurately offset, present invention determine that the mode of atmospheric pressure compensating value can also be In whole test process, the offset tested every time is all obtained by preceding n times test statisticses.
For example, for the setting pressure of aeration phase, on the premise of atmospheric pressure compensating value is 0,5 gas replenishment processes are carried out, The blowing pressure value at the end of 5 aeration phases is correspondingly can obtain, and it is flat at the end of equilibrium stage after aeration phase Weigh pressure value.So, can be according to formula Δ P=Pbal-PfillCalculating obtains 5 offset Δ P1、ΔP2、ΔP3、ΔP4And Δ P5, then this 5 offsets are averaging, resulting average value is the offset finally determined.Pass through what is repeatedly tested Mode, can obtain more accurately pressure supplement, so as to improve the accuracy of detection.
In embodiments of the present invention, the test result that foregoing embedded system is determined (for example judges tested product gas leakage Or qualified etc.) can be reported by sound, LED, LCD liquid crystal display screen etc., or the external interface for passing through embedded system It is connected on PC and shows.
Correspondingly, present invention also offers the method that the airtight detecting apparatus using the present invention carries out airtight detection.
Fig. 5 is that use Fig. 1 according to an embodiment of the invention airtight detecting apparatus carries out the method flow of airtight detection Figure.As shown in figure 5, this method includes:
S501, in aeration phase, embedded system detects the pressure value that baroceptor collects and reaches filling for setting During air pressure force threshold, the control shut-off charge valve.
S502, in equilibrium stage, the pressure value that embedded system detection baroceptor is collected is relative to the first benchmark Whether the change value of pressure of value exceedes the balance detection threshold value of setting.Wherein, at the end of the first reference value is aeration phase The pressure value that baroceptor is collected.
If it is to perform step S503 to be detected as, the tested big gas leakage of product is judged, and control to open the air bleeding valve It is exhausted.
If being detected as no, execution step S504, under gas leakage detection pattern, embedded system detection baroceptor Whether the pressure value collected exceedes the gas leakage detection threshold value of setting relative to the change value of pressure of the second a reference value.Wherein, institute State the pressure value that the second a reference value collects for the baroceptor at the end of the equilibrium stage.
If it is to perform step S505 to be detected as, the tested product gas leakage is judged, and control to open the air bleeding valve and Row exhaust.If being detected as no, execution step S506, judge that the tested product are qualified.
Fig. 6 is that use Fig. 1 according to another embodiment of the present invention airtight detecting apparatus carries out the method stream of airtight detection Cheng Tu.As shown in figure 5, this method includes:
S601, in aeration phase, embedded system detects the pressure value that baroceptor collects and reaches filling for setting During air pressure force threshold, the control shut-off charge valve.
S602, in equilibrium stage, the pressure value that embedded system detection baroceptor is collected is relative to the first benchmark Whether the change value of pressure of value exceedes the balance detection threshold value of setting.Wherein, at the end of the first reference value is aeration phase The pressure value that baroceptor is collected.
If it is to perform step S603 to be detected as, the big gas leakage of tested product is judged, and control opening air bleeding valve to be arranged Gas.
If being detected as no, execution step S604, under ventilative detection pattern, embedded detecting system detects air pressure transmission Whether the pressure value that sensor is collected is more than the first ventilative detection threshold value of setting relative to the change value of pressure of the second a reference value. Wherein, the pressure value that baroceptor is collected at the end of the second a reference value is equilibrium stage.
If being detected as no, execution step S605, judge that tested product do not leak exception, and control opening air bleeding valve to be arranged Gas.If it is to perform step S606 to be detected as, embedded detecting system continues to detect whether above-mentioned change value of pressure is less than the Two ventilative detection threshold values.If being detected as no, execution step S607, judge that the tested product superleak is abnormal, and control to open The air bleeding valve is exhausted.If it is to perform step S608 to be detected as, judge that tested product are qualified.
Alternatively, before the airtight detection method of the embodiment of the present invention may additionally include step S501 or S601, it is determined that filling The atmospheric pressure compensating value in gas stage, and new the blowing pressure threshold is determined according to the blowing pressure threshold value and air pressure offset of setting Value.The description as described in compensating module 91 and ventilating control module 92 herein above is for details, reference can be made to, be will not be repeated here.
Although the present invention allows many various forms of embodiments, specification and drawings are only described in detail the present invention's Several possible embodiments.It is to be appreciated that the disclosure should be considered as the illustration to the principle of the invention, it is not intended to this Invention is limited in the range of exemplified embodiment.Without departing from the spirit of the invention, people in the art Member will recognize that many deformations, and protection scope of the present invention should be determined by the content of appended claims.

Claims (3)

1. a kind of direct press type airtight detecting apparatus, including:
High pressure filter;
The pressure regulator valve being connected with the high pressure filter gas circuit;
The charge valve being connected with the pressure regulator valve gas circuit;
The gas tank being connected with the charge valve gas circuit, the gas tank is internally provided with baroceptor, and the gas tank is annoying Road is connected to tested product;
The air bleeding valve being connected with the gas tank gas circuit;
Embedded system, is electrically connected with the charge valve, the baroceptor and the air bleeding valve respectively;
Wherein, the baroceptor sends the pressure value collected to the embedded system;And, the embedded system System includes being used in aeration phase, when the blowing pressure threshold for detecting the pressure value that the baroceptor collects and reaching setting During value, control turns off the charge valve so that the embedded system can be held in follow-up equilibrium stage and/or detection-phase The ventilating control module of the corresponding airtight detection of row;
The embedded system also includes:For in equilibrium stage, detecting that the pressure value that the baroceptor is collected is relative Whether exceed the balance detection threshold value of setting in the change value of pressure of first reference value, if it is to judge the quilt to be detected as The big gas leakage of survey product, and control to open the balance detection module of the air bleeding valve;
Wherein, the pressure value that the baroceptor is collected at the end of the first reference value is the aeration phase;
The embedded system also includes compensating module, for obtaining the baroceptor at the end of top n aeration phase The N number of the blowing pressure value collected;Obtain N number of balance that the baroceptor is collected at the end of top n equilibrium stage Pressure value;And, pressure supplement Δ P is calculated according to below equation:
<mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>P</mi> <mrow> <mi>b</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mo>-</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>P</mi> <mrow> <mi>f</mi> <mi>i</mi> <mi>l</mi> <mi>l</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mo>/</mo> <mi>N</mi> </mrow>
Wherein, Pfill(i) the blowing pressure value at the end of i-th of aeration phase, P are representedbal(i) i-th of equilibrium stage knot is represented Balance pressure value during beam, 1≤i≤N, N is any integer value;
The ventilating control module is additionally operable to determine new inflation according to the blowing pressure threshold value of the pressure supplement and storage Pressure threshold:Pnewth=Poldth- Δ P, wherein, PoldthFor the blowing pressure threshold value initially set.
2. detection device according to claim 1, it is characterised in that the embedded system also includes:For in gas leakage Under detection pattern, detect whether the pressure value that the baroceptor is collected surpasses relative to the change value of pressure of the second a reference value Cross the gas leakage detection threshold value of setting;If it is to judge the tested product gas leakage to be detected as, and controls to open the air bleeding valve; If being detected as no, the qualified gas leakage detection module of the tested product is judged;
Wherein, the pressure value that the baroceptor is collected at the end of second a reference value is the equilibrium stage.
3. detection device according to claim 1 or 2, it is characterised in that the embedded system also includes being used to realize The ventilative detection module of following functions:
Under ventilative detection pattern, detect that the pressure value that the baroceptor is collected becomes relative to the pressure of the second a reference value Whether change value breathes freely between detection threshold value and the second ventilative detection threshold value of setting the first of setting, wherein, second base The pressure value that quasi- value collects for the baroceptor at the end of the equilibrium stage, and the described second ventilative detection threshold value More than the described first ventilative detection threshold value;
If being detected as the change value of pressure less than the described first ventilative detection threshold value, judge that the tested product do not leak different Often, and control to open the air bleeding valve;
If being detected as the change value of pressure more than the described second ventilative detection threshold value, judge that the tested product superleak is different Often, and control to open the air bleeding valve;
If being detected as the change value of pressure between the described first ventilative detection threshold value and the second ventilative detection threshold value, Then judge that the tested product are qualified.
CN201410375113.XA 2014-07-31 2014-07-31 Direct press type airtight detecting apparatus CN104135706B (en)

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CN105675398B (en) * 2015-12-24 2018-10-23 广州广电计量检测股份有限公司 High gas pressure test system and method
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CN108260068B (en) * 2017-12-22 2020-05-29 歌尔股份有限公司 Microphone sealing performance testing method and device
CN108307282B (en) * 2017-12-26 2020-08-07 潍坊歌尔微电子有限公司 Method for verifying welding quality of MEMS microphone
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DE102007016859A1 (en) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Motor vehicle fuel tank system's leakage testing method, involves terminating leakage testing for tank system and evaluating parameter characterizing tank leakage when low pressure threshold is not reached within given time period
CN101236124A (en) * 2008-02-29 2008-08-06 上海大学 Embedded leakage detector
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