CN102829933B - Air tightness detector for photoelectric instrument - Google Patents
Air tightness detector for photoelectric instrument Download PDFInfo
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- CN102829933B CN102829933B CN201210333356.8A CN201210333356A CN102829933B CN 102829933 B CN102829933 B CN 102829933B CN 201210333356 A CN201210333356 A CN 201210333356A CN 102829933 B CN102829933 B CN 102829933B
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Abstract
The invention relates to an air tightness detector for a photoelectric instrument. The air tightness detector comprises a nitrogen on-line quality analysis module, a first air inflation channel, a second air inflation channel and a single-chip microcomputer control circuit, wherein the nitrogen on-line quality analysis module is formed by connecting a dew-point meter, a nitrogen purity analysis meter and a digital type pressure meter; the first air inflation channel is formed by connecting a first precise pressure reducing valve, a first magnetic valve and a first digital type pressure switch; the second air inflation channel is formed by connecting a second precise pressure reducing valve, a second magnetic valve and a second digital type pressure switch; the single-chip microcomputer control circuit is connected with each component, and the air quality of an input air source and the air inflation time, air inflation pressure and other indexes of the air inflation of the photoelectric instrument are monitored in real time. The air tightness detector for the photoelectric instrument disclosed by the invention is suitable for the air tightness detection of inner cavities of various precise photoelectric instruments, and can be widely used for the air tightness detection of newly developed or repaired photoelectric instruments in a photoelectric instrument development organization or repair factory.
Description
Technical field
The present invention relates to a kind of air-tightness detection device, specifically a kind of photoelectric instrument air-leakage detector.
Background technology
For guaranteeing the normal use of accurate photoelectric instrument, before photoelectric instrument dispatches from the factory or repair and complete the rear nitrogen that all will be filled with high-purity, low dew point, to prevent that mildewing from appearring in photoelectric instrument inside, fog phenomenon.The pure nitrogen that is filled with photoelectric instrument inner chamber carries out gas slowly by each parts connection space of photoelectric instrument and ambient atmosphere and exchanges, relevant criterion all has strict demand to photoelectric instrument leak source, leakage rate etc., when Leakage Gas speed is greater than setting, think that this photoelectric instrument exists gas leak phenomenon, exist the photoelectric instrument of serious gas leak phenomenon due to corrosive gas and the steam introduced in atmosphere, will cause that photoelectric instrument inner occurs serious mildewing, fog phenomenon, thereby affect the normal use of photoelectric instrument.
So, to carry out airtight test to photoelectric instrument in advance.Existing inspection method is that tested photoelectric instrument bleeder port is connected with one end of a U-shaped mercury slug, then utilize photoelectric instrument inflatable interface to be filled with wherein dry pure nitrogen, U-shaped mercury slug other end mercury liquid level starts to rise, while rising to a certain position, cut off source of inflation gas, whether observe mercury liquid level occurs declining at the appointed time---and mercury liquid level declines, and indicates gas leak phenomenon; Otherwise, represent that the impermeability of this photoelectric instrument is good.This air-tightness detection method, need to rely on eye-observation on the one hand, and human factor is larger on testing result impact; On the other hand, also the inapplicable synchronous impermeability to large quantity photoelectric instrument detects.
Summary of the invention
Object of the present invention is just to provide a kind of photoelectric instrument air-leakage detector, to solve impermeability, detects the larger problem of testing result error that relies on manual observation to exist.
The present invention is achieved in that a kind of photoelectric instrument air-leakage detector, includes:
Dew point hygrometer, join with nitrogen gas purity analyser, gas bleed valve and single chip machine controlling circuit respectively, for detection of the dewpoint temperature of input nitrogen, and dewpoint temperature source of the gas not up to standard is discharged by gas bleed valve, dewpoint temperature source of the gas up to standard is outputed to nitrogen gas purity analyser;
Nitrogen gas purity analyser, join with described dew point hygrometer, gas bleed valve, digital pressure gauge and single chip machine controlling circuit respectively, for detection of the purity of input nitrogen, and purity source of the gas not up to standard is discharged by gas bleed valve, purity source of the gas up to standard is outputed to digital pressure gauge;
Digital pressure gauge, join with described nitrogen gas purity analyser, gas bleed valve, the first precise pressure-reducing valve, the second precise pressure-reducing valve and single chip machine controlling circuit respectively, pressure for detection of input nitrogen, and pressure source of the gas not up to standard is discharged by gas bleed valve, pressure source of the gas up to standard is outputed to respectively to the first precise pressure-reducing valve and the second precise pressure-reducing valve;
Gas bleed valve, joins with described dew point hygrometer, described nitrogen gas purity analyser, described digital pressure gauge and single chip machine controlling circuit, for getting rid of source of the gas not up to standard;
The first precise pressure-reducing valve, joins with described digital pressure gauge and the first solenoid valve respectively, for exporting after the first setting value that the pressure of input source of the gas is reduced pressure;
The first solenoid valve, joins with described the first precise pressure-reducing valve, the first digital pressure switch and single chip machine controlling circuit respectively, for the first gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
The first digital pressure switch, joins with described the first solenoid valve and single chip machine controlling circuit respectively, for the first gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
The second precise pressure-reducing valve, joins with described digital pressure gauge and the second solenoid valve respectively, for exporting after the second setting value that the pressure of input source of the gas is reduced pressure;
The second solenoid valve, joins with described the second precise pressure-reducing valve, the second digital pressure switch and single chip machine controlling circuit respectively, for the second gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
The second digital pressure switch, joins with described the second solenoid valve and single chip machine controlling circuit respectively, for the second gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
Single chip machine controlling circuit, join with described dew point hygrometer, described nitrogen gas purity analyser, described digital pressure gauge, described blowdown valve, described the first solenoid valve, described the first digital pressure switch, described the second solenoid valve, described the second digital pressure switch, display and hummer respectively, be used for the gaseous mass of input source of the gas, to inflationtime and the charge pressure of tested instrument inflation, carry out Real-Time Monitoring, and send display to show impermeability testing result;
Display, joins with described single chip machine controlling circuit, for showing impermeability testing result; And
Hummer, joins with described single chip machine controlling circuit, for give alarm in the situation that detection has gas leakage.
Photoelectric instrument air-leakage detector of the present invention also includes:
The first pressure transducer, is arranged on the gas channels of described the first digital pressure switch back, joins with described single chip machine controlling circuit, is filled with the charge pressure value of tested photoelectric instrument for Real-Time Monitoring; And
The second pressure transducer, is arranged on the gas channels of described the second digital pressure switch back, joins with described single chip machine controlling circuit, is filled with the charge pressure value of tested photoelectric instrument for Real-Time Monitoring.
The present invention, by the online quality analysis module of nitrogen being comprised of dew point hygrometer, nitrogen gas purity analyser and digital pressure gauge, detects the technical requirement whether the nitrogen quality being input in tested photoelectric instrument meets regulation; The interior software of controlling of sheet that utilizes single chip machine controlling circuit, carries out Real-Time Monitoring to the gaseous mass being filled with, inflationtime, charge pressure, when gaseous mass, inflationtime, charge pressure do not reach setting value, utilizes display and buzzer warning; Precise pressure-reducing valve is provided with two, respectively the nitrogen pressure of input is stablized and is depressurized to two kinds of different infrabar, precise pressure-reducing valve adopts the aperture of the opening and closing element in application valve body to carry out adjusting gas flow, while is by the effect of downstream pressure, regulate the aperture of opening and closing element, thereby downstream pressure is kept within the specific limits, in the situation that inlet gas pressure changes, also can keep exit gas pressure in the scope of setting.
The present invention is that the impermeability of photoelectric instrument detects, a kind of automatic measuring device that detects code requirement that meets is provided, can eliminate the interference of human factor, guarantee accuracy and reliability that impermeability detects, the impermeability that has solved thus the photoelectric instrument that has impermeability requirement detects a difficult problem, effectively prevented that photoelectric instrument from mildewing, the generation of fog phenomenon, and technical indicator that can corresponding raising photoelectric instrument.
The present invention utilizes the online quality analysis module of nitrogen to realize the quality monitoring of input nitrogen, utilizes single chip machine controlling circuit to control digital pressure switch and the solenoid valve in two gas fill port, and the impermeability that has realized thus photoelectric instrument detects.The present invention has small intelligent, the feature such as highly integrated, easy to use, and the impermeability that can carry out two kinds of photoelectric instruments under different infrabar pressure conditions detects, and in the situation that photoelectric instrument impermeability lost efficacy, gives alarm.The invention solves impermeability and detect the larger problem of testing result error that relies on manual observation to exist, can detect the synchronous impermeability of large quantity photoelectric instrument, the impermeability that is applicable to various accurate photoelectric instrument inner chambers detects, can be widely used in impermeability testing that photoelectric instrument research institute and maintenance depot carry out the photoelectric instrument that newly grinds or repair after completing, to guaranteeing photoelectric instrument the key technical indexes, prevent from mildewing, the generation of fog phenomenon is significant.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention composes in series the online quality analysis module of nitrogen mutually by dew point hygrometer, nitrogen gas purity analyser and digital pressure gauge, detects the technical requirement whether the nitrogen quality being input in tested photoelectric instrument meets regulation; Dew point hygrometer, nitrogen gas purity analyser and digital pressure gauge join with gas bleed valve respectively, when source of the gas up to standard being detected not, and under the control of single chip machine controlling circuit, the corresponding source of the gas of releasing in time.
What join with the online quality analysis module of nitrogen output terminal is two-way gas fill port, and each road is respectively arranged with precise pressure-reducing valve, so that the input source of the gas of 200kPa is decompressed to two kinds of different infrabar; In each gas fill port, be also connected to the combination switch valve being formed by solenoid valve and digital pressure switch, under the control of single chip machine controlling circuit, realize automatic unlatching and the shutoff of each gas fill port.
The first gas fill port is to be composed in series by the first precise pressure-reducing valve, the first solenoid valve and the first digital pressure switch, and its output terminal is that infrabar detects mouth one.The second gas fill port is to be composed in series by the second precise pressure-reducing valve, the second solenoid valve and the second digital pressure switch, and its output terminal is that infrabar detects mouth two.
Single chip machine controlling circuit joins with dew point hygrometer, nitrogen gas purity analyser, digital pressure gauge, blowdown valve, the first solenoid valve, the first digital pressure switch, the second solenoid valve, the second digital pressure switch respectively, so that the indexs such as the gaseous mass of input source of the gas and the inflationtime of inflating to photoelectric instrument and charge pressure are carried out to Real-Time Monitoring, and can set according to user initial parameter is modified; In the sheet of single chip machine controlling circuit, control software and also can receive setting and the modification of user to inflationtime initial setting parameter.On the output terminal of single chip machine controlling circuit, be also connected to display and hummer, in order to show impermeability testing result, and in the situation that detection has gas leakage, give alarm.Display can be LCD display or LCDs.
The present invention also output terminal of the first gas fill port after the first digital pressure switch is provided with the first pressure transducer, and the output terminal of the second gas fill port after the second digital pressure switch is provided with the second pressure transducer; The first pressure transducer and the second pressure transducer join with single chip machine controlling circuit respectively, are filled with the charge pressure value of tested photoelectric instrument for Real-Time Monitoring, and detect data to single chip machine controlling circuit transmission.
The present invention also can use casing of light-duty aluminum frame manufacture, precise pressure-reducing valve, single chip machine controlling circuit, digital pressure switch, solenoid valve etc. are arranged in casing, and the LCD display of detection port, pressure and constant voltage time is positioned on the front panel of casing.Stabilized voltage supply is also housed in casing, so that 220V AC power is converted to the required direct-current working volts such as single chip machine controlling circuit.
Principle of work of the present invention is: 200kPa clean dry nitrogen enters in photoelectric instrument air-leakage detector of the present invention through detection port, dew point hygrometer in the online quality analysis module of nitrogen carries out dewpoint temperature detection to the nitrogen of input, nitrogen gas purity analyser carries out purity detecting to the nitrogen of input, and digital pressure gauge carries out gas pressure detection to the nitrogen of input; If input gaseous mass does not reach the gaseous mass requirement of regulation, single chip machine controlling circuit is opened gas bleed valve, and defective gas is discharged to detector; If input gaseous mass reaches the gaseous mass requirement of regulation, utilize threeway that the nitrogen of input is distributed in two-way gas fill port.In two-way gas fill port, the gas of input is decompressed to two kinds of infrabar that pressure is different through the first precise pressure-reducing valve and the second precise pressure-reducing valve respectively; Two direct-acting electromagnetic valves are controlled its switching by single chip machine controlling circuit respectively, place a digital pressure switch after each solenoid valve.Be tapped at two high precision the first pressure transducer and the second high-precision pressure sensors in gas fill port, Real-Time Monitoring is filled with the charge pressure value of tested photoelectric instrument.
If inflationtime surpasses the longest inflationtime of regulation, and pressure does not reach setting value yet, represents that tested photoelectric instrument has gas leakage situation, single chip machine controlling circuit is controlled LCD display and hummer sends sound and light alarm; If inflationtime reaches the force value of setting in the longest inflationtime of regulation, when the gas pressure value of photoelectric instrument inner chamber and the force value of this detector inside are stablized to two kinds of different infrabar, solenoid valve and digital pressure switch that single chip machine controlling circuit is controlled in two gas fill port are closed, and the nitrogen source of the gas of input is discharged this detector by air-outlet valve.
Single chip machine controlling circuit utilizes control software in sheet to carry out Real-Time Monitoring to inflationtime, charge pressure, in official hour, the variation of the gas pressure value of photoelectric instrument inner chamber is not less than the gas pressure value of regulation, think the requirement that touches the mark of the impermeability of tested photoelectric instrument inner chamber, single chip machine controlling circuit is shown in impermeability testing result in LCD display simultaneously.
Claims (2)
1. a photoelectric instrument air-leakage detector, is characterized in that, includes:
Dew point hygrometer, join with nitrogen gas purity analyser, gas bleed valve and single chip machine controlling circuit respectively, for detection of the dewpoint temperature of input nitrogen, and dewpoint temperature nitrogen not up to standard is discharged by gas bleed valve, dewpoint temperature nitrogen up to standard is outputed to nitrogen gas purity analyser;
Nitrogen gas purity analyser, join with described dew point hygrometer, gas bleed valve, digital pressure gauge and single chip machine controlling circuit respectively, for detection of the purity of input nitrogen, and purity nitrogen not up to standard is discharged by gas bleed valve, purity nitrogen up to standard is outputed to digital pressure gauge;
Digital pressure gauge, join with described nitrogen gas purity analyser, gas bleed valve, the first precise pressure-reducing valve, the second precise pressure-reducing valve and single chip machine controlling circuit respectively, pressure for detection of input nitrogen, and pressure nitrogen not up to standard is discharged by gas bleed valve, pressure nitrogen up to standard is outputed to respectively to the first precise pressure-reducing valve and the second precise pressure-reducing valve;
Gas bleed valve, joins with described dew point hygrometer, described nitrogen gas purity analyser, described digital pressure gauge and single chip machine controlling circuit, for discharging nitrogen not up to standard;
The first precise pressure-reducing valve, joins with described digital pressure gauge and the first solenoid valve respectively, for exporting after the first setting value that the pressure of input nitrogen is reduced pressure;
The first solenoid valve, joins with described the first precise pressure-reducing valve, the first digital pressure switch and single chip machine controlling circuit respectively, for the first gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
The first digital pressure switch, joins with described the first solenoid valve and single chip machine controlling circuit respectively, for the first gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
The second precise pressure-reducing valve, joins with described digital pressure gauge and the second solenoid valve respectively, for exporting after the second setting value that the pressure of input nitrogen is reduced pressure;
The second solenoid valve, joins with described the second precise pressure-reducing valve, the second digital pressure switch and single chip machine controlling circuit respectively, for the second gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
The second digital pressure switch, joins with described the second solenoid valve and single chip machine controlling circuit respectively, for the second gas fill port being carried out to switch control under the control of single chip machine controlling circuit;
Single chip machine controlling circuit, join with described dew point hygrometer, described nitrogen gas purity analyser, described digital pressure gauge, described gas bleed valve, described the first solenoid valve, described the first digital pressure switch, described the second solenoid valve, described the second digital pressure switch, display and hummer respectively, be used for the gaseous mass of input nitrogen, to inflationtime and the charge pressure of tested instrument inflation, carry out Real-Time Monitoring, and send display to show impermeability testing result;
Display, joins with described single chip machine controlling circuit, for showing impermeability testing result; And
Hummer, joins with described single chip machine controlling circuit, for give alarm in the situation that detection has gas leakage.
2. according to the photoelectric instrument air-leakage detector described in claim 1, it is characterized in that, also include:
The first pressure transducer, is arranged on the gas channels of described the first digital pressure switch back, joins with described single chip machine controlling circuit, is filled with the charge pressure value of tested photoelectric instrument for Real-Time Monitoring; And
The second pressure transducer, is arranged on the gas channels of described the second digital pressure switch back, joins with described single chip machine controlling circuit, is filled with the charge pressure value of tested photoelectric instrument for Real-Time Monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210333356.8A CN102829933B (en) | 2012-09-11 | 2012-09-11 | Air tightness detector for photoelectric instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210333356.8A CN102829933B (en) | 2012-09-11 | 2012-09-11 | Air tightness detector for photoelectric instrument |
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| CN102829933A CN102829933A (en) | 2012-12-19 |
| CN102829933B true CN102829933B (en) | 2014-10-08 |
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| CN104567852B (en) * | 2015-01-23 | 2018-08-31 | 北京航天时代光电科技有限公司 | A kind of fibre optic gyroscope airtight construction part and its air tightness testing method |
| CN108151988B (en) * | 2017-12-13 | 2024-04-09 | 中山火炬职业技术学院 | Detection method of high-precision air tightness detection equipment |
| CN109141782A (en) * | 2018-09-18 | 2019-01-04 | 昆明北方红外技术股份有限公司 | The airtight test of ultralow pressure and gas substitution detector |
| CN109900438A (en) * | 2019-03-04 | 2019-06-18 | 湖北三江航天万峰科技发展有限公司 | A kind of precision optical instrument pumping inflation leak test platform |
| CN115493778A (en) * | 2022-09-15 | 2022-12-20 | 广西电网有限责任公司北海供电局 | Main transformer nitrogen injection pressurization monitoring device |
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