CN202153177U - Leakage amount detector of vacuum cavity - Google Patents
Leakage amount detector of vacuum cavity Download PDFInfo
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- CN202153177U CN202153177U CN2011202408604U CN201120240860U CN202153177U CN 202153177 U CN202153177 U CN 202153177U CN 2011202408604 U CN2011202408604 U CN 2011202408604U CN 201120240860 U CN201120240860 U CN 201120240860U CN 202153177 U CN202153177 U CN 202153177U
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Abstract
The utility model discloses a leakage amount detector of a vacuum cavity, comprising a differential pressure sensor and a controller, wherein the differential pressure sensor comprises two gas input ends, one gas input end is connected with the atmosphere, the other gas input end is connected with a to-be-detected vacuum cavity, the controller comprises a power supply module, a signal processing module, a processor and an alarming output module, the processor obtains pressure of the vacuum cavity to the atmosphere for the first time via the signal processing module, the processor obtains pressure of the vacuum cavity to the atmosphere for the second time via the signal processing module after a preset period. The processor calculates the real pressure difference between the two pressures and compares the real pressure difference with a set pressure difference preset in the processor, and then the alarming output module outputs corresponding signals according to the result. The leakage amount detector of a vacuum cavity is high in detection precision, simple and beautiful, and can satisfy the demand of large-scale production.
Description
Technical field
The utility model relates to the vacuum chamber impermeability Automatic Measurement Technique of EGR valve in the gas recirculation system, more particularly, relates to a kind of amount of leakage detector of vacuum chamber.
Background technology
The noxious emission of engine is a main source that causes atmospheric pollution, along with the importance of environmental protection problem increases day by day, reduces the important directions that this target of Engine's Harmful Emission becomes engine development in the world today.It is the set emission-control equipment of oxynitrides NOx to one of harmful gas in the engine exhaust that gas recirculation system is called for short EGR.Control unit of engine ECU is according to relevant informations such as the rotating speed of engine, coolant temperature, accelerator open degrees; The control vacuum solenoid is opened moderately and at the right moment, and intake depression gets into EGR valve vacuum diaphragm chamber through solenoid valve, makes diaphragm form pressure reduction up and down; Drive stay is with the EGR valve open; Few part waste gas in the exhaust is introduced gas handling system through the EGR valve, mix the back with combination gas and get into cylinder participation burning, the temperature when reducing burning in the cylinder; Suppress the generation once more of NOx, thereby reduced the content of the NOx in the waste gas.The EGR valve is the core component of gas recirculation system EGR, and directly controls the impermeability of the vacuum diaphragm chamber of aperture, is again the important assurance that can the EGR valve work on request.Therefore whether qualified, the leakage rate of vacuum chamber is the parameter that the EGR valve is produced strict control and paid close attention to, also be EGR important indicator.
The leakage rate of vacuum chamber generally adopts pointer vacuum meter to detect at present, exists measuring accuracy lower, and not directly perceived, can't well satisfy problems such as requirement of large-scale production.Therefore, a kind of simple and direct vacuum chamber detector becomes production and reviewer's active demand.
Summary of the invention
Pointer vacuum meter measuring accuracy to existing in the prior art is lower, and not directly perceived, can't well satisfy the problem of requirement of large-scale production, and the purpose of the utility model provides a kind of amount of leakage detector of vacuum chamber.
For achieving the above object, the technical scheme that the utility model adopts is following:
A kind of amount of leakage detector of vacuum chamber comprises differential pressure pickup and controller, and said differential pressure pickup comprises two gas input ends, and one of them gas input end links to each other with atmosphere, and another gas input end links to each other with vacuum chamber to be measured; Said controller comprises power module; Signal processing module; Processor and alarm output module; The input end of said signal processing module links to each other with the output terminal of said differential pressure pickup, and the input end of said processor links to each other with the output terminal of said signal processing module, and the input end of said alarm output module links to each other with the output terminal of said processor.
Said power module comprises transformer, rectification circuit and secondary power supply change-over circuit; The input end of said transformer links to each other with AC power; The input end of said rectification circuit links to each other with the output terminal of transformer, and the input end of said secondary power supply change-over circuit links to each other with the output terminal of rectification circuit.
Said signal processing module comprises filtering shaping circuit, modulus conversion chip, test button, dividing potential drop filtering shaping circuit and phase inverter; The input end of said filtering shaping circuit links to each other with the output terminal of said differential pressure pickup; The input end of said modulus conversion chip links to each other with the output terminal of said filtering shaping circuit, and the output terminal of said modulus conversion chip links to each other with said processor; One end of said test button links to each other with power module, and the other end links to each other with the input end of dividing potential drop filtering shaping circuit; The input end of said phase inverter links to each other with the output terminal of dividing potential drop filtering shaping circuit, the output terminal of phase inverter with link to each other with said processor.
Compared with prior art; Adopt the amount of leakage detector of a kind of vacuum chamber of the utility model, comprise differential pressure pickup and controller, said differential pressure pickup comprises two gas input ends; One of them gas input end links to each other with atmosphere, and another gas input end links to each other with vacuum chamber to be measured; Said controller comprises power module; Signal processing module; Processor and alarm output module; The input end of said signal processing module links to each other with the output terminal of said differential pressure pickup, and the input end of said processor links to each other with the output terminal of said signal processing module, and the input end of said alarm output module links to each other with the output terminal of said processor; Said power module is that each several part and the egr system in the said amount of leakage detector provides power supply.Processor obtains the pressure of the relative atmosphere of vacuum chamber first through signal processing module; After the preset time, processor obtains the pressure of the relative atmosphere of vacuum chamber for the second time through signal processing module; Processor calculates twice vacuum chamber actual pressure difference with respect to atmosphere; With the actual pressure difference be preset in set pressure difference in the processor and compare after, send corresponding signal by the alarm output module according to comparative result.The amount of leakage detector of the utility model has accuracy of detection height, simple to operate, and testing process is intuitive and reliable, can satisfy characteristics such as large-scale production demand.
Description of drawings
Fig. 1 is the principle schematic of the amount of leakage detector of a kind of vacuum chamber of the utility model;
Fig. 2 is the circuit diagram of the power module of the utility model.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with accompanying drawing and embodiment.
See also Fig. 1, shown in Figure 2: the amount of leakage detector of a kind of vacuum chamber that the utility model provides, comprise differential pressure pickup S1 and controller, differential pressure pickup S1 comprises two gas input ends; One of them gas input end P1 links to each other with atmosphere; Another gas input end P2 links to each other with vacuum chamber to be measured, and differential pressure pickup S1 also has 3 each pin, and promptly pin 1 is power supply (Vcc); Pin 3 is ground connection (GND), and pin 2 is signal output.Controller comprises power module; Signal processing module; Be labeled as processor MCU and the alarm output module of U1; The input end of signal processing module links to each other with the output terminal of differential pressure pickup S1, and the input end of processor MCU links to each other with the output terminal of signal processing module, and the input end of alarm output module links to each other with the output terminal of processor MCU.
Signal processing module comprises filtering shaping circuit, modulus (A/D) conversion chip U2, test button K2, dividing potential drop filtering shaping circuit and phase inverter U3; The input end of filtering shaping circuit links to each other with the output terminal of differential pressure pickup S1; The input end of modulus conversion chip U2 links to each other with the output terminal of filtering shaping circuit, and the output terminal of modulus conversion chip U2 links to each other with processor MCU; The end of test button K2 links to each other with power module, and the other end links to each other with the input end of dividing potential drop filtering shaping circuit; The input end of phase inverter U3 links to each other with the output terminal of dividing potential drop filtering shaping circuit, the output terminal of phase inverter U3 with link to each other with processor MCU.The effect of signal processing module mainly comprises two parts, and first is to differential pressure pickup output Signal Processing.The function of differential pressure pickup S1 is that the relative pressure with two gas input ends converts voltage signal output to, so that the processor MCU perception is handled.Since the signal driving force directly exported of differential pressure pickup S1 generally a little less than; Be subject to disturb; And the desired accuracy of detection of the detector of the utility model is higher, thus by differential pressure pickup S1 directly the signal of output need pass through that R1, R2, R3, C1 form on draw plastic filter circuit after, pass through the conversion of modulus conversion chip U2 again; With this continually varying analog quantity of voltage; Convert discrete digital quantity to, the output corresponding digital signals inserts the first input end mouth IN1 of processor MCU, so that processor MCU is obtained.Second portion is handled test button K2 signal, and test button K2 is reducible button, after vacuum chamber to be measured and differential pressure pickup S1 gas input end P2 are connected with flexible pipe; Press test button K2, show and detect beginning, the 12V output of test button K2 one termination voltage stabilizing chip 7812; Other end connecting resistance R4; After pressing test button K2,12V voltage is through the bleeder circuit dividing potential drop of resistance R 4 with the R5 composition, after the shaping of capacitor C 2 filtering and voltage stabilizing diode Z2; Convert the reliable voltage of 4.7V into, avoid abnormal signal to cause the infringement of processor MCU.Unclamp test button K2, signal becomes 0V, unclamps after promptly pressing test button K2, will produce a pulse, and through inserting the second input port IN2 of processor MCU behind the phase inverter U3, processor MCU whenever detects a pulse again, the beginning of expression one-time detection.
See also power module shown in Figure 2 again and comprise transformer T1, bridge rectifier circuit, secondary power supply change-over circuit; The input end of transformer T1 links to each other with AC power; The input end of rectification circuit links to each other with the output terminal of transformer T1, and the input end of secondary power supply change-over circuit links to each other with the output terminal of rectification circuit.Power module is with the alternating current process transformer T1 commonly used step-down of 220V/50Hz; Access is transformed to direct current by the bridge rectifier circuit that four diode D1, D2, D3, D4 form with alternating current, and the required various voltages of amount of leakage detector of the utility model are provided after the conversion of direct current through the secondary power supply change-over circuit; After wherein the direct current input marking is the voltage stabilizing chip 7812 of U4; Convert the direct current after the step-down shaping into stable 12V power supply, supply egr system to use, again through after being labeled as the three-terminal voltage-stabilizing chip 7805 of U5; Output+5V power supply supplies inner each module of the said amount of leakage detector of the utility model to use.
The alarm output module mainly is a LED light, comprises qualified green light of expression and the underproof red light of expression.Wherein, L1 is green LED light, the first output port OUT1 of a termination processor MCU, and the other end is through resistance R 6 back ground connection.L2 is red LED light, the second output port OUT2 of a termination processor MCU, and the other end is through resistance R 7 back ground connection.When detecting at 10s during second for example of preset time; The air pressure of twice vacuum chamber with respect to atmospheric actual pressure difference less than in the set pressure difference allowed band that is preset in the processor; The first output port OUT1 output high level of processor MCU; Green light is lighted, and shows that the vacuum leak amount of this valve is qualified; Otherwise the second output port OUT2 of processor MCU exports a fixed pulse, and blinking red lamp shows that the leakage rate of this valve exceeds standard, and is defective.
During use, power turn-on K switch 1, power module is started working; Output+12V and+two kinds of DC voltages of 5V, the gas input end P2 with differential pressure pickup S1 links to each other with vacuum chamber to be measured with flexible pipe, and gas input end P1 need not connect; Be reference with current atmospheric pressure promptly, press test button K2, processor MCU reads the pressure P 1 of the relative atmosphere of current vacuum chamber; Through the regular hour (being set at 10s), detect the pressure P 2 of the relative atmosphere of vacuum chamber once more, calculate twice vacuum chamber with respect to atmospheric changing value △ P=|P1-P2|; If △ P is in allowed band; The first output port OUT1 output high level of processor CPU, green light is lighted, and shows that the vacuum leak amount of this valve is qualified; If △ P exceeds allowed band, the second output port OUT2 of processor CPU exports a fixed pulse, and blinking red lamp shows that the leakage rate of this valve exceeds standard, and is defective.Again press test button K2, a new round detects beginning.
Those of ordinary skill in the art will be appreciated that; Above embodiment only is the purpose that is used for explaining the utility model; And be not with the qualification of doing the utility model; As long as in the essential scope of the utility model, in the scope to the variation of the above embodiment, claim that modification all will drop on the utility model.
Claims (3)
1. the amount of leakage detector of a vacuum chamber; It is characterized in that: comprise differential pressure pickup and controller; Said differential pressure pickup comprises two gas input ends, and one of them gas input end links to each other with atmosphere, and another gas input end links to each other with vacuum chamber to be measured; Said controller comprises power module; Signal processing module; Processor and alarm output module; The input end of said signal processing module links to each other with the output terminal of said differential pressure pickup, and the input end of said processor links to each other with the output terminal of said signal processing module, and the input end of said alarm output module links to each other with the output terminal of said processor.
2. amount of leakage detector according to claim 1; It is characterized in that: said power module comprises transformer, rectification circuit and secondary power supply change-over circuit; The input end of said transformer links to each other with AC power; The input end of said rectification circuit links to each other with the output terminal of transformer, and the input end of said secondary power supply change-over circuit links to each other with the output terminal of rectification circuit.
3. amount of leakage detector according to claim 1; It is characterized in that: said signal processing module comprises filtering shaping circuit, modulus conversion chip, test button, dividing potential drop filtering shaping circuit and phase inverter; The input end of said filtering shaping circuit links to each other with the output terminal of said differential pressure pickup; The input end of said modulus conversion chip links to each other with the output terminal of said filtering shaping circuit, and the output terminal of said modulus conversion chip links to each other with said processor; One end of said test button links to each other with power module, and the other end links to each other with the input end of dividing potential drop filtering shaping circuit; The input end of said phase inverter links to each other with the output terminal of dividing potential drop filtering shaping circuit, the output terminal of phase inverter with link to each other with said processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202408604U CN202153177U (en) | 2011-07-09 | 2011-07-09 | Leakage amount detector of vacuum cavity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202408604U CN202153177U (en) | 2011-07-09 | 2011-07-09 | Leakage amount detector of vacuum cavity |
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| CN202153177U true CN202153177U (en) | 2012-02-29 |
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| CN2011202408604U Expired - Fee Related CN202153177U (en) | 2011-07-09 | 2011-07-09 | Leakage amount detector of vacuum cavity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706521A (en) * | 2012-06-25 | 2012-10-03 | 昆山市恒安工业气体有限公司 | Automatic airtightness detection system for voltage regulator |
| CN103335795A (en) * | 2013-07-02 | 2013-10-02 | 中国科学院光电研究院 | System for measuring partial pressure leakage rate of vacuum sealing component and measuring method thereof |
| CN106762264A (en) * | 2016-11-15 | 2017-05-31 | 柳州柳工挖掘机有限公司 | The identifying device of engine aspirating system pressure anomaly and recognition methods |
| CN113246946A (en) * | 2021-05-30 | 2021-08-13 | 重庆长安汽车股份有限公司 | Electronic vacuum pump system fault processing method |
-
2011
- 2011-07-09 CN CN2011202408604U patent/CN202153177U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706521A (en) * | 2012-06-25 | 2012-10-03 | 昆山市恒安工业气体有限公司 | Automatic airtightness detection system for voltage regulator |
| CN103335795A (en) * | 2013-07-02 | 2013-10-02 | 中国科学院光电研究院 | System for measuring partial pressure leakage rate of vacuum sealing component and measuring method thereof |
| CN103335795B (en) * | 2013-07-02 | 2016-05-04 | 中国科学院光电研究院 | Vacuum seal dividing potential drop leakage rate measurement system and measuring method thereof |
| CN106762264A (en) * | 2016-11-15 | 2017-05-31 | 柳州柳工挖掘机有限公司 | The identifying device of engine aspirating system pressure anomaly and recognition methods |
| CN113246946A (en) * | 2021-05-30 | 2021-08-13 | 重庆长安汽车股份有限公司 | Electronic vacuum pump system fault processing method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 214028 South Road, New District, Jiangsu, Wuxi, No. 231-3 Patentee after: Wuxi Longsheng Technology Co., Ltd. Address before: 214028 South Road, New District, Jiangsu, Wuxi, No. 231-3 Patentee before: Wuxi Longsheng Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120229 Termination date: 20140709 |
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| EXPY | Termination of patent right or utility model |