CN202403867U - Digital-type vacuometer - Google Patents
Digital-type vacuometer Download PDFInfo
- Publication number
- CN202403867U CN202403867U CN2011205428421U CN201120542842U CN202403867U CN 202403867 U CN202403867 U CN 202403867U CN 2011205428421 U CN2011205428421 U CN 2011205428421U CN 201120542842 U CN201120542842 U CN 201120542842U CN 202403867 U CN202403867 U CN 202403867U
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- module
- mcu
- working current
- vacuum
- vacuum gauge
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Abstract
The utility model provides a digital-type vacuometer, aiming at solving the problems of the thermocouple cold junction compensation, temperature drift, inaccurate working current of vacuum gauge tube and the like of the present vacuometer. The vacuometer comprises an MCU (microprogrammed control unit), a thermocouple sensor, a digital-modulation working current module, a first RF (radio frequency) module, a liquid crystal display module, a keyboard and a power supply module which are connected with the MCU, and a sensor interface connected with the thermocouple sensor and the digital-modulation working current module, wherein a vacuum gauge tube is arranged on the sensor interface, and a second RF module is arranged in the vacuum gauge tube.
Description
Technical field
The utility model relates to the vacuum tightness detection range, and a kind of vacuum tightness that is used to detect vacuum tank is provided, and directly shows in (Pa) to be the digital vacuum heat of the vacuum values of unit.
Background technology
At present, the weak point that exists of the traditional thermocouple vacuum gauge of China is following:
1, adopt AFE(analog front end) to amplify on the circuit structure--A/D quantifications--processor--demonstration, this scheme to cold junction compensation and temperature drift problem all can not be basic solution.
2, the vacuum gauge working current is regulated through mechanical potentiometer, and the output current precision can not guarantee at all.
3, the staking-out work electric current that dispatches from the factory will not have way in test test if user side has been forgotten vacuum gauge, need just can use after the replacing.
The utility model content
The purpose of the utility model is to the deficiency of above prior art a kind of vacuum tightness that is used to detect vacuum tank to be provided, and directly shows in (Pa) to be the digital vacuum heat of the vacuum values of unit.
The utility model is for realizing that above-mentioned purpose adopts following technical scheme:
A kind of digital vacuum meter; It is characterized in that: comprise MCU; The thermocouple sensor that is connected with MCU, number are transferred working current module, a RF module; Also comprise the sensor interface that is connected with thermopair sensing and number accent working current module, the connection vacuum gauge that is connected with sensor interface, be provided with the 2nd RF module in the said vacuum gauge; Said MCU is preset with thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction data; In the test process; The one RF module noncontact scans the nominal data and send data to MCU of dispatching from the factory in the 2nd RF module; MCU is through internal arithmetic, and the control number transfers the working current module that the high precision working current is added in the vacuum gauge through sensor interface, and the thermocouple electric signal of thermopair sensing module collection simultaneously flows to MCU and compares computing with preset data.
The RF module that is adopted in the above scheme; It act as through the nominal data and send data to MCU of dispatching from the factory in the RF module in the noncontact scanning vacuum gauge; Thereby the input current of MCU control vacuum gauge; Simultaneously also can adopt keyboard manually to import the vacuum gauge working current, its concrete scheme is following:
A kind of digital vacuum meter; It is characterized in that: comprise MCU; The thermocouple sensor that is connected with MCU, number are transferred the working current module, also comprise the sensor interface that is connected with thermocouple sensing and number accent working current module, the connection vacuum gauge that is connected with sensor interface, and keyboard; Said MCU is preset with thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction data; In the test process; Through keyboard mode of operation and the working current of manually importing vacuum gauge are set manually; MCU is through internal arithmetic, and the control number transfers the working current module that the high precision working current is added in the vacuum gauge through sensor interface, and the thermocouple electric signal of thermopair sensing module collection simultaneously flows to MCU and compares computing with preset data.
The utility model also comprises LCD MODULE, the demarcation current value of vacuum gauge, and the thermocouple electric signal of thermopair sensing module collection flows to MCU and compares calculated result with preset data and on LCD MODULE, show.
The utility model keyboard is used to be provided with mode of operation and the working current of manually importing vacuum gauge.
The model of said MCU is MAX6675 or MAX31855.
In the utility model alternative plan, the 2nd RF module model that is provided with in the said vacuum gauge is ZLG522ST.
The utility model also comprises power module, and said power module adopts lithium battery as power supply.
The utlity model has following beneficial effect:
One, the utility model is provided with traditional thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction tables of data in advance in MUC; The user is in test process; Through the specific vacuum gauge head of RF module noncontact scanning; Vacuum gauge dispatches from the factory and demarcates current value and on " LCD MODULE ", show automatically, even in that the staking-out work electric current that dispatches from the factory also can easily record the electric current that dispatches from the factory if user side has been forgotten vacuum gauge.
Two, this practicality has been made accurate adjustment through MUC to the working current of vacuum gauge, has guaranteed the degree of accuracy of output current.
Three, the utility model adopts MAX6675 or MAX31855 chip to solve thermocouple cold junction compensation and temperature drift problem.
Description of drawings
Fig. 1 is the systematic schematic diagram of the utility model.
Embodiment
A kind of digital vacuum meter; Its spy comprises MCU; The thermocouple sensor that is connected with MCU, number are transferred working current module, a RF module; Also comprise the sensor interface that is connected with thermopair sensing and number accent working current module, the connection vacuum gauge that is connected with sensor interface, be provided with the 2nd RF module in the said vacuum gauge; Said MCU is preset with thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction data; In the test process; The one RF module noncontact scans the nominal data and send data to MCU of dispatching from the factory in the 2nd RF module; MCU is through internal arithmetic, and the control number transfers the working current module that the high precision working current is added in the vacuum gauge through sensor interface, and the thermocouple electric signal of thermopair sensing module collection simultaneously flows to MCU and compares computing with preset data.
The RF module that is adopted in the above scheme; It act as through the nominal data and send data to MCU of dispatching from the factory in the RF module in the noncontact scanning vacuum gauge; Thereby the input current of MCU control vacuum gauge; Simultaneously also can adopt keyboard manually to import the vacuum gauge working current, its concrete scheme is following:
A kind of digital vacuum meter; It is characterized in that: comprise MCU; The thermocouple sensor that is connected with MCU, number are transferred the working current module, also comprise the sensor interface that is connected with thermopair sensing and number accent working current module, the connection vacuum gauge that is connected with sensor interface, and keyboard; Said MCU is preset with thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction data; In the test process; Through keyboard mode of operation and the working current of manually importing vacuum gauge are set manually; MCU is through internal arithmetic, and the control number transfers the working current module that the high precision working current is added in the vacuum gauge through sensor interface, and the thermocouple electric signal of thermopair sensing module collection simultaneously flows to MCU and compares computing with preset data.
The utility model also comprises LCD MODULE, the demarcation current value of vacuum gauge, and the thermocouple electric signal of thermopair sensing module collection flows to MCU and compares calculated result with preset data and on LCD MODULE, show.
The utility model keyboard is used to be provided with mode of operation and the working current of manually importing vacuum gauge.
The model of said MCU is MAX6675 or MAX31855.
In the utility model alternative plan, the 2nd RF module model that is provided with in the said vacuum gauge is ZLG522ST.
The utility model also comprises power module, and said power module adopts lithium battery as power supply.
The utility model is used to detect the vacuum tightness of vacuum tank, directly shows with (Pa) to be the vacuum values of unit, and the designing technique standard parameter is following:
1. measurement range: 100Pa to 0.1Pa;
2. heating current range of adjustment: 90 to 130mA;
3. regulate the degree of stability of heating current: ± 1%.
The digital vacuum meter of the utility model has been widely used in the vacuum measurement of vehicle-mounted LNG fuel tank vacuum tank, uses the back feedback information to show that this instrument obviously is superior to and like product in measuring accuracy and operating aspect to the user.
Claims (10)
1. digital vacuum meter; It is characterized in that: comprise MCU; The thermocouple sensor that is connected with MCU, number are transferred working current module, a RF module; Also comprise the sensor interface that is connected with thermopair sensing and number accent working current module, the connection vacuum gauge that is connected with sensor interface, be provided with the 2nd RF module in the said vacuum gauge; Said MCU is preset with thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction data; In the test process; The one RF module noncontact scans the nominal data and send data to MCU of dispatching from the factory in the 2nd RF module; MCU is through internal arithmetic, and the control number transfers the working current module that the high precision working current is added in the vacuum gauge through sensor interface, and the thermocouple electric signal of thermopair sensing module collection simultaneously flows to MCU and compares computing with preset data.
2. a kind of digital vacuum meter according to claim 1; It is characterized in that: also comprise LCD MODULE; The demarcation current value of vacuum gauge, and the thermocouple electric signal of thermopair sensing module collection flows to MCU and compares calculated result with preset data and on LCD MODULE, show.
3. a kind of digital vacuum meter according to claim 1 is characterized in that: also comprise keyboard, said keyboard is provided with mode of operation and the working current of manually importing vacuum gauge.
4. a kind of digital vacuum meter according to claim 1 is characterized in that: the model of MCU is MAX6675 or MAX31855.
5. a kind of digital vacuum meter according to claim 1 is characterized in that: the 2nd RF module model that is provided with in the said vacuum gauge is ZLG522ST.
6. a kind of digital vacuum meter according to claim 1 is characterized in that: also comprise power module, said power module adopts lithium battery as power supply.
7. digital vacuum meter; It is characterized in that: comprise MCU; The thermocouple sensor that is connected with MCU, number are transferred the working current module, also comprise the sensor interface that is connected with thermopair sensing and number accent working current module, the connection vacuum gauge that is connected with sensor interface, and keyboard; Said MCU is preset with thermocouple millivolt electric signal and vacuum handkerchief value corresponding data table and offset correction data; In the test process; Through keyboard mode of operation and the working current of manually importing vacuum gauge are set manually; MCU is through internal arithmetic, and the control number transfers the working current module that the high precision working current is added in the vacuum gauge through sensor interface, and the thermocouple electric signal of thermopair sensing module collection simultaneously flows to MCU and compares computing with preset data.
8. a kind of digital vacuum meter according to claim 7; It is characterized in that: also comprise LCD MODULE; The demarcation current value of vacuum gauge, and the thermocouple electric signal of thermopair sensing module collection flows to MCU and compares calculated result with preset data and on LCD MODULE, show.
9. a kind of digital vacuum meter according to claim 7 is characterized in that: the model of MCU is MAX6675 or MAX31855.
10. a kind of digital vacuum meter according to claim 7 is characterized in that: also comprise power module, said power module adopts lithium battery as power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205428421U CN202403867U (en) | 2011-12-22 | 2011-12-22 | Digital-type vacuometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205428421U CN202403867U (en) | 2011-12-22 | 2011-12-22 | Digital-type vacuometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202403867U true CN202403867U (en) | 2012-08-29 |
Family
ID=46701509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205428421U Expired - Lifetime CN202403867U (en) | 2011-12-22 | 2011-12-22 | Digital-type vacuometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202403867U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196628A (en) * | 2013-03-08 | 2013-07-10 | 成都倍特科技有限责任公司 | Vacuum degree on-line detecting system |
| CN103557991A (en) * | 2013-11-11 | 2014-02-05 | 姚文利 | Method and device for calibrating vacuum gauge for measuring pressure |
| CN110940456A (en) * | 2018-12-12 | 2020-03-31 | 株式会社爱发科 | Pressure measuring system |
| CN112061100A (en) * | 2020-08-20 | 2020-12-11 | 东风汽车集团有限公司 | Vacuum booster, brake boosting control system and control method |
-
2011
- 2011-12-22 CN CN2011205428421U patent/CN202403867U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196628A (en) * | 2013-03-08 | 2013-07-10 | 成都倍特科技有限责任公司 | Vacuum degree on-line detecting system |
| WO2014134972A1 (en) * | 2013-03-08 | 2014-09-12 | 成都科瑞尔低温设备有限公司 | Vacuum degree on-line detection system |
| CN103557991A (en) * | 2013-11-11 | 2014-02-05 | 姚文利 | Method and device for calibrating vacuum gauge for measuring pressure |
| CN103557991B (en) * | 2013-11-11 | 2015-12-30 | 姚文利 | A kind of for tonometric vacuum gauge calibration method and device thereof |
| CN110940456A (en) * | 2018-12-12 | 2020-03-31 | 株式会社爱发科 | Pressure measuring system |
| CN110940456B (en) * | 2018-12-12 | 2021-09-28 | 株式会社爱发科 | Pressure measuring system |
| CN112061100A (en) * | 2020-08-20 | 2020-12-11 | 东风汽车集团有限公司 | Vacuum booster, brake boosting control system and control method |
| CN112061100B (en) * | 2020-08-20 | 2021-11-23 | 东风汽车集团有限公司 | Vacuum booster, brake boosting control system and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120829 |
|
| CX01 | Expiry of patent term |