CN104122046A - Air-tightness test device and method - Google Patents
Air-tightness test device and method Download PDFInfo
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- CN104122046A CN104122046A CN201310152636.3A CN201310152636A CN104122046A CN 104122046 A CN104122046 A CN 104122046A CN 201310152636 A CN201310152636 A CN 201310152636A CN 104122046 A CN104122046 A CN 104122046A
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Abstract
The invention discloses an air-tightness test device and an air-tightness test method. The air-tightness test device comprises an air-tightness test unit, a pneumatic unit and a control unit, wherein the air-tightness test unit is provided with a seal cavity; the pneumatic unit comprises an air source and a sensor; and the control unit calculates the variation quantity of the air pressure within a predetermined time after the air pressure in the seal cavity reaches preset air pressure according to the air pressure detected by the sensor. According to the air-tightness test device, if a housing of a product to be tested leaks, the air pressure in the seal cavity changes, and whether the leak of the product to be tested meets requirements can be judged according to the variation quantity of the air pressure. The air-tightness test device is suitable for production waterproof test requirements and the research and development of IP67 and IP68 of mobile phones or other hand-held electronic products.
Description
Technical field
The air tightness testing method that the present invention relates to a kind of test device for air tightness and utilize this test device for air tightness to carry out, especially for test case as the test device for air tightness of the Water-proof air-tight of the electronic product of mobile phone and method of testing.
Background technology
Along with the development of electronic product electric property, the range of application with communication products of water resistance etc. is more and more extensive, it is important that quality to this every profession and trade Related product and Safety Inspection also show day, and bubble-tight inspection is the important means that ensures product quality and safe water resistance.
The test device for air tightness of known a kind of mobile communication terminal, it comprises mobile communication terminal shell, on mobile communication terminal shell, there is an instrument connection, the gas flow of source of the gas output is in succession by after reduction valve and gas-filled switching tube, enter mobile communication terminal inside through described instrument connection, baroceptor one end communicates with described instrument connection by gas ducting, the other end is connected to a pressure display instrument, use barometric control unit that gas flow is set up to required measuring air pressure value, after interior of mobile phone enters packing state, the atmospheric pressure value of observing pressure display instrument changes, thereby judge that whether the airtight test of mobile phone is qualified, ensure the waterproof quality of mobile communication terminal product.
But the whole airtightness detection technique of the above waterproof mobile phone is used the casing in tape test hole, the gas that blows certain pressure from instrument connection carrys out the pressure that analog equipment is subject to water, judges according to the variable quantity that is blown into gas whether mobile phone leaks gas.This scheme has following drawback: the first, and what this kind blown generation from inside is malleation, it is high that interiors of products pressure ratio outside surface is wanted, contrary with actual product pressurized, impact test effect; The second, perforate housing and practical set housing are inconsistent, affect product final test accuracy; The 3rd, in test process, can bring airborne dust into interior of mobile phone.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of test device for air tightness, and it need to not test on test products in perforate, and pressure condition and leakage situation that direct modeling product is placed in certain depth water are tested.
The present invention is achieved through the following technical solutions: a kind of test device for air tightness, wherein, described test device for air tightness comprises air tightness test unit, pneumatic unit and control module, described air tightness test unit has the seal chamber for holding product to be tested, described pneumatic unit comprises for making the air pressure in described seal chamber reach the source of the gas of predefined air pressure and the sensor for detection of described seal chamber internal gas pressure, described control module is connected with described pneumatic unit, and the air pressure that described control module detects according to described sensor, calculate air pressure in described seal chamber and reach the variable quantity of the air pressure in described seal chamber within the predetermined time after predefined air pressure.
As the further improvement of technique scheme, described test device for air tightness also comprises to be analyzed and display unit, and described analysis and display unit are connected with described control module so that according to the air pressure in described seal chamber, the variable quantity within the predetermined time draws air tightness test result and shows detecting information.
As the further improvement of technique scheme, described test device for air tightness comprises described at least one air tightness test unit and pneumatic unit described at least one, described analysis and display unit are computing machine, and described control module is connected by RS232 communication interface with described analysis and display unit.
As the further improvement of technique scheme, described predefined air pressure is corresponding to according to the air pressure of the waterproof rank of IEC34-5 motor degree of protection.
As the further improvement of technique scheme, described seal chamber comprises sealing counterdie, sealing patrix and Inlet gas connector, described sealing counterdie and described sealing patrix are suitable, and described air tightness test unit also has the air-actuated jaw of the folding for realizing described seal chamber, described air-actuated jaw is by described control module control, and described seal chamber is connected with described source of the gas through described Inlet gas connector.
As the further improvement of technique scheme, described source of the gas is single cylinder cylinder, described source of the gas has descending thrust cavity, described source of the gas utilizes the descending thrust cavity of single cylinder cylinder, the travel position of the piston rod by regulating single cylinder cylinder is adjusted the descending thrust cavity volume of single cylinder cylinder, and then adjusts the volume of the gases at high pressure that are filled with described seal chamber.
As the further improvement of technique scheme, described pneumatic unit also comprises air operated controller, two-way electromagnetic valve, the first electrovalve, the second electrovalve and the 3rd electrovalve, described air operated controller, described two-way electromagnetic valve, described the first electrovalve, described the 3rd electrovalve and described Inlet gas connector connect successively, the import of described the second electrovalve is connected between described the first electrovalve and described the 3rd electrovalve and for discharging the gases at high pressure in described seal chamber, described air operated controller is for regulating and stablize the output pressure of described pneumatic unit, the output terminal of described source of the gas is connected described seal chamber through described the first electrovalve with described the 3rd electrovalve.
In technique scheme, described product to be tested can be mobile phone.
According to a further aspect in the invention, provide a kind of air tightness testing method, it is for testing the air-tightness of product to be tested, and described air tightness testing method comprises aeration step and testing procedure.In aeration step, accommodating after the seal chamber closure of described product to be tested, by the source of the gas of pneumatic unit, gases at high pressure are filled with in described seal chamber, make the air pressure in described seal chamber reach predefined air pressure.In testing procedure, after the stable gas pressure in described seal chamber, the air pressure that control module detects according to described sensor, calculates air pressure in described seal chamber and reaches the variable quantity of the air pressure in described seal chamber within the predetermined time after predefined air pressure.
As the further improvement of technique scheme, described air tightness testing method also comprises analysis and step display and blowdown step.In analysis and step display, according to the air pressure in described seal chamber, the variable quantity within the predetermined time draws test result and shows detecting information computing machine.In blowdown step, control module control air-actuated jaw is opened described seal chamber, discharges the gases at high pressure in described seal chamber, makes the air pressure in described seal chamber equal atmospheric pressure.
The invention has the beneficial effects as follows: according to test device for air tightness of the present invention, comprise air tightness test unit, pneumatic unit and control module, product to be tested is contained in to the seal chamber of air tightness test unit, source of the gas by pneumatic unit is filled with gases at high pressure in seal chamber, make the air pressure in seal chamber reach predefined air pressure, if existing, reveals the housing of product to be tested, the gases at high pressure that are filled with are leaked to inside from the outside surface of product to be tested, air pressure in seal chamber changes, whether the leakage that can judge product to be tested according to the changing value of air pressure reaches requirement.The production waterproof test that test device for air tightness of the present invention is particularly useful for mobile phone or other handheld electronic commodity requires and IP67, the research and development of IP68.
Brief description of the drawings
Fig. 1 is according to the cross-sectional view of the air tightness test unit of the test device for air tightness of a specific embodiment of the present invention.
Fig. 2 is the schematic block diagram of the test device for air tightness of Fig. 1.
Fig. 3 is another schematic block diagram of the test device for air tightness of Fig. 1.
Fig. 4 is the air tightness test principle schematic of the test device for air tightness of Fig. 1.
Fig. 5 is the structural representation of the pneumatic unit of the test device for air tightness of Fig. 1.
Fig. 6 is the structural representation of the another kind of pneumatic unit of the test device for air tightness of Fig. 1.
Fig. 7 is according to the schematic flow sheet of the air tightness testing method of a specific embodiment of the present invention.
Fig. 8 is according to the schematic flow sheet of the air tightness testing method of another specific embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing to test device for air tightness of the present invention and utilize the specific embodiment of the air tightness testing method that this test device for air tightness carries out to be introduced.
Test device for air tightness of the present invention and air tightness testing method by being filled with quantitative gases at high pressure in seal chamber, make outside surface and the inner mineralization pressure of the product to be tested that is positioned at seal chamber poor, simulate product to be tested and be put into the pressured state in water.
See figures.1.and.2, described test device for air tightness comprises air tightness test unit 100, pneumatic unit 200 and control module 300.The seal chamber that described air tightness test unit 100 has for holding product 18 to be tested.Described pneumatic unit 200 comprises for making the air pressure in described seal chamber reach the source of the gas of predefined air pressure and the sensor for detection of described seal chamber internal gas pressure.Described control module 300 is connected with described pneumatic unit 200, and the air pressure that described control module 300 detects according to described sensor, calculates air pressure in described seal chamber and reaches the variable quantity of the air pressure in described seal chamber within the predetermined time after predefined air pressure.
With reference to Fig. 3, in another embodiment of the present invention, described test device for air tightness also comprises to be analyzed and display unit 400.Described analysis and display unit 400 are connected with described control module 300 so that according to the air pressure in described seal chamber, the variable quantity within the predetermined time draws air tightness test result and shows detecting information.And wherein, described analysis and display unit 400 can be computing machine, and described control module 300 is connected by RS232 communication interface with described analysis and display unit 400.In described analysis and display unit 400, dependence test program can be installed, to draw efficiently and accurately air tightness test result and to show detecting information.
With reference to Fig. 4, air tightness test principle of the present invention is described.As shown in Figure 4, V1 represents gases at high pressure to be entered storage area, and V2 represents the extraneous gas region of product to be tested, and V3 represents that the internal gas of product to be tested can leak area.Wherein, gases at high pressure to be entered storage area V1 is for example source of the gas interior zone, and the extraneous gas region V2 of product to be tested and the internal gas of product to be tested can leak area V3 be for example the respective regions of seal chamber inside.Calculate when V1 is after the extraneous gas region V2 input gas of product to be tested according to Clapyron Equation formula PV=nRT (P represents that pressure, V represent that gas volume, n represent that amount of substance, R represent that gas ratio constant, T represent absolute temperature), mixed air pressure P=(P1V1+P2V2)/(V1+V2) (P1 is pressure corresponding to gases at high pressure to be entered storage area V1, pressure corresponding to extraneous gas region V2 that P2 is product to be tested).In the time carrying out air tightness test, first in gases at high pressure to be entered storage area V1, be filled with gases at high pressure, in the extraneous gas region V2 of product to be tested, it is normal atmosphere (An), then open the valve between the extraneous gas region V2 of gases at high pressure to be entered storage area V1 and product to be tested, mixed gas pressure intensity P=(P1V1+P2V2)/(V1+V2).Can, by adjusting gases at high pressure to be entered storage area air pressure P1 and gases at high pressure to be entered storage area V1 size, make mixed gas pressure intensity reach predefined atmospheric pressure value.In the present invention, described predefined air pressure is corresponding to according to the air pressure of the waterproof rank of IEC34-5 motor degree of protection, and for example, predefined atmospheric pressure value can be corresponding to the waterproof rank of IP67 or IP68, and product to be tested is waterproof mobile phone.In the time of valve between the extraneous gas region V2 that closes gases at high pressure to be entered storage area V1 and product to be tested, if the gas leakage in the extraneous gas region V2 of product to be tested to the internal gas of product to be tested can leak area V3 in, P'=(PV2+P3V3)/(V2+V3), equal normal atmosphere (An) because the internal gas of product to be tested can leak area V3 starts pressure, after revealing, P' is not equal to P.Can leak to P' according to the size of P' and P and judge that at the variable quantity of predefined time internal gas pressure product to be tested reveals situation and whether meet the requirements.
With reference to Fig. 1, described seal chamber comprises sealing counterdie 110, sealing patrix 120 and Inlet gas connector 137.Described seal chamber is connected with described source of the gas through described Inlet gas connector 137.Described sealing counterdie 110 is suitable with described sealing patrix 120, salable pressing together, and can be separated from each other.Particularly, described sealing patrix 120 has protuberance 132, correspondingly seals counterdie 110 and has depressed part 131.Protuberance 132 matches with depressed part 131.And be provided with O-ring seal 136 between described sealing counterdie 110 and described sealing patrix 120.In addition, described air tightness test unit 100 also has the air-actuated jaw (not shown) of the folding for realizing described seal chamber, and described air-actuated jaw is controlled by described control module 300.In the time product 18 to be tested being put into seal chamber and by air-actuated jaw, sealing counterdie 110 and described sealing patrix 120 are pressed together, seal chamber is partitioned into the extraneous gas region 133 of product to be tested by product to be tested and the internal gas of product to be tested can leak area 135.
With reference to Fig. 5, generation and the output of gases at high pressure is mainly realized in pneumatic control unit 200.Described pneumatic unit 200 also comprises the devices such as air operated controller 210, two-way electromagnetic valve 211, the first electrovalve 213, the second electrovalve 215 and the 3rd electrovalve 216.Described air operated controller 210, described two-way electromagnetic valve 211, described the first electrovalve 213, described the 3rd electrovalve 216 and described Inlet gas connector 137 connect successively.The import of described the second electrovalve 215 is connected between described the first electrovalve 213 and described the 3rd electrovalve 216, and for discharging the gases at high pressure in described seal chamber.Sensor 214 is arranged on the downstream of the first electrovalve 213, can be used for detecting described seal chamber internal gas pressure.Described air operated controller 210 is for regulating and stablize the output pressure of described pneumatic unit 200.The output terminal of described source of the gas 212 is connected between described two-way electromagnetic valve 211 and described the first electrovalve 213, and the output terminal of described source of the gas 212 is connected described seal chamber through described the first electrovalve 213 with described the 3rd electrovalve 216.In the present embodiment, described source of the gas 212 is single cylinder cylinder, and described source of the gas 212 has descending thrust cavity, and changes by the volume of adjusting descending thrust cavity the gases at high pressure volume being filled with in described seal chamber.
With reference to Fig. 6, for increasing work efficiency, described test device for air tightness comprises 2 described air tightness test unit and 2 described pneumatic units.In addition, can be not limited to 2, also can be how described air tightness test unit and described pneumatic unit, and 2 or multiple described air tightness test unit and 2 or multiple described pneumatic unit can share an air operated controller 210, control module, one and analyze and display unit., in another air tightness test unit 100A, place another product 18A to be tested.And pneumatic unit 200A also comprises two-way electromagnetic valve 221, the first electrovalve 223, the second electrovalve 225 and the 3rd electrovalve 226.Described air operated controller 220, described two-way electromagnetic valve 221, described the first electrovalve 223, described the 3rd electrovalve 226 and described Inlet gas connector 137 connect successively.The import of described the second electrovalve 225 is connected between described the first electrovalve 223 and described the 3rd electrovalve 226, and for discharging the gases at high pressure in described seal chamber.Sensor 224 is arranged on the downstream of the first electrovalve 213, can be used for detecting described seal chamber internal gas pressure.Described air operated controller 220 is for regulating and stablize the output pressure of described pneumatic unit 200.The output terminal of described source of the gas 222 is connected between described two-way electromagnetic valve 221 and described the first electrovalve 223, and the output terminal of described source of the gas 222 is connected described seal chamber through described the first electrovalve 223 with described the 3rd electrovalve 226.Described source of the gas 222 utilizes the descending thrust cavity of single cylinder cylinder, and the travel position of the piston rod by adjusting cylinders is adjusted the descending thrust cavity volume of single cylinder cylinder, to adjust the volume of the gases at high pressure that are filled with described seal chamber.
As mentioned above, test device for air tightness of the present invention regulates the pressure of gases at high pressure to be filled with by air operated controller, makes it reach the requirement of setting.And be filled with and be not filled with seal chamber by two-way electromagnetic valve control gases at high pressure.The control module of test device for air tightness of the present invention is by RS232 interface and computer communication, and by test configurations input information control module, each device of control module control pneumatic unit moves.And the barometric information in the seal chamber that control module collects by sensor sends computing machine analysis to by RS232 interface.What test device for air tightness of the present invention can be revealed initial value and be revealed rate of change and setting value by test relatively judges that whether test products is qualified, sets it as test result and shows.
According to a further aspect in the invention, provide a kind of air tightness testing method, it utilizes above-mentioned test device for air tightness to carry out the air-tightness test of for example mobile phone of product to be tested.As shown in Figure 7, described air tightness testing method comprises aeration step S1 and testing procedure S2.In aeration step S1, accommodating after the seal chamber closure of described product to be tested, by the source of the gas of pneumatic unit, gases at high pressure are filled with in described seal chamber, make the air pressure in described seal chamber reach predefined air pressure.In addition, before aeration step S1, test device for air tightness is in holding state, and the air pressure in seal chamber equals atmospheric pressure (variation of the seal chamber internal gas pressure causing while not considering seal chamber closure).In testing procedure S2, after the stable gas pressure in described seal chamber, the air pressure that control module detects according to described sensor, calculates air pressure in described seal chamber and reaches the variable quantity of the air pressure in described seal chamber within the predetermined time after predefined air pressure.Wherein, after the stable gas pressure in described seal chamber, test again, can reduce the fluctuation of test data, obtain test result more accurately.Can make the stable gas pressure in described seal chamber by air operated controller.
As shown in Figure 8, in another embodiment, described air tightness testing method also comprises to be analyzed and step display S3 and blowdown step S4.In analysis and step display S3, according to the air pressure in described seal chamber, the variable quantity within the predetermined time draws test result and shows detecting information computing machine.In blowdown step S4, control module control air-actuated jaw is opened described seal chamber, discharges the gases at high pressure in described seal chamber, makes the air pressure in described seal chamber equal atmospheric pressure.In following table 1, shown the constitutional diagram of each device of pneumatic unit, the state of each device can be controlled by computing machine and control module.
The test steering logic relation table of the each device of table 1 pneumatic unit
As implied above, design verification and production test that test device for air tightness of the present invention and method of testing are the product of for example waterproof mobile phone provide effective method of testing and equipment.Test device for air tightness of the present invention and method of testing need to be on product to be tested perforate or assemble any auxiliary accessories and test, pressure condition and leakage situation that direct modeling product is placed in certain depth water are tested.This test device for air tightness of the present invention and method of testing provide a set of complete, accurate, simple, efficient scheme, and this proving installation can test out the bleeder vent that product is more than or equal to 5 microns.
Herein, term " IP67 ", in " IP68 ", IP refers to the ability of showing anti-contact and water resistant according to IEC34-5 motor protection table of grading, after 2 numerals, the 1st the anti-solid of numeral contacts and breakdown capability; The ability of the 2nd numeral water resistant.The first bit data 6 expressions prevent the complete preservation contacting with charged or inner moving-member.Second-order digit 7 representatives are worked as equipment and are immersed in water, and under the pressure and time conditions of regulation, the water liquid that immerses equipment must not exceed harmful quantity.Second-order digit 8 represents that, if equipment is immersed in water, the water liquid in immersion equipment must not exceed harmful quantity.In addition, RS232 interface is the standard for serial communication by EIA (EIA) associating Bell System, the common formulation of modulator-demodular unit producer and terminal manufacturer in 1970.Moreover Clapyron Equation formula is that the Ideal-Gas Equation (also claiming perfect gas law, C1apeyron equation) is to idealize gas in the time of beinthebalancestate, the state equation of pressure, volume, amount of substance, Relations with Temperature.It is based upon on the empirical laws such as Boyle's law, Charles's law, Gay-Lussac's law.
Above embodiment has been described in detail the present invention, but these are not construed as limiting the invention.Protection scope of the present invention is not limited with above-mentioned embodiment, as long as the equivalence that those of ordinary skill in the art do according to disclosed content is modified or changed, all should include in the protection domain of recording in claims.
Claims (10)
1. a test device for air tightness, it is characterized in that, described test device for air tightness comprises air tightness test unit, pneumatic unit and control module, described air tightness test unit has the seal chamber for holding product to be tested, described pneumatic unit comprises for making the air pressure in described seal chamber reach the source of the gas of predefined air pressure and the sensor for detection of described seal chamber internal gas pressure, described control module is connected with described pneumatic unit, and the air pressure that described control module detects according to described sensor, calculate air pressure in described seal chamber and reach the variable quantity of the air pressure in described seal chamber within the predetermined time after predefined air pressure.
2. test device for air tightness according to claim 1, it is characterized in that, described test device for air tightness also comprises to be analyzed and display unit, and described analysis and display unit are connected with described control module so that according to the air pressure in described seal chamber, the variable quantity within the predetermined time draws air tightness test result and shows detecting information.
3. test device for air tightness according to claim 2, it is characterized in that, described test device for air tightness comprises described at least one air tightness test unit and pneumatic unit described at least one, described analysis and display unit are computing machine, and described control module is connected by RS232 communication interface with described analysis and display unit.
4. test device for air tightness according to claim 1, is characterized in that, described predefined air pressure is corresponding to according to the air pressure of the waterproof rank of IEC34-5 motor degree of protection.
5. test device for air tightness according to claim 1, it is characterized in that, described seal chamber comprises sealing counterdie, sealing patrix and Inlet gas connector, described sealing counterdie and described sealing patrix are suitable, and described air tightness test unit also has the air-actuated jaw of the folding for realizing described seal chamber, described air-actuated jaw is by described control module control, and described seal chamber is connected with described source of the gas through described Inlet gas connector.
6. test device for air tightness according to claim 1, it is characterized in that, described source of the gas is single cylinder cylinder, described source of the gas has descending thrust cavity, described source of the gas utilizes the descending thrust cavity of single cylinder cylinder, the travel position of the piston rod by regulating single cylinder cylinder is adjusted the descending thrust cavity volume of single cylinder cylinder, and then adjusts the volume of the gases at high pressure that are filled with described seal chamber.
7. test device for air tightness according to claim 1, it is characterized in that, described pneumatic unit also comprises air operated controller, two-way electromagnetic valve, the first electrovalve, the second electrovalve and the 3rd electrovalve, described air operated controller, described two-way electromagnetic valve, described the first electrovalve, described the 3rd electrovalve and described Inlet gas connector connect successively, the import of described the second electrovalve is connected between described the first electrovalve and described the 3rd electrovalve and for discharging the gases at high pressure in described seal chamber, described air operated controller is for regulating and stablize the output pressure of described pneumatic unit, the output terminal of described source of the gas is connected described seal chamber through described the first electrovalve with described the 3rd electrovalve.
8. test device for air tightness according to claim 1, is characterized in that, described product to be tested is mobile phone.
9. an air tightness testing method, for testing the air-tightness of product to be tested, is characterized in that, described air tightness testing method comprises the following steps:
S1 aeration step: accommodating after the seal chamber closure of described product to be tested, by the source of the gas of pneumatic unit, gases at high pressure are filled with in described seal chamber, make the air pressure in described seal chamber reach predefined air pressure; With
S2 testing procedure: after the stable gas pressure in described seal chamber, the air pressure that control module detects according to described sensor, calculates air pressure in described seal chamber and reaches the variable quantity of the air pressure in described seal chamber within the predetermined time after predefined air pressure.
10. air tightness testing method according to claim 9, is characterized in that, described air tightness testing method is further comprising the steps of:
S3 analyzes and step display: according to the air pressure in described seal chamber, the variable quantity within the predetermined time draws test result and shows detecting information computing machine; With
S4 blowdown step: control module control air-actuated jaw is opened described seal chamber, discharges the gases at high pressure in described seal chamber, makes the air pressure in described seal chamber equal atmospheric pressure.
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Application publication date: 20141029 |