CN201740754U - Automatically controlled liquid nitrogen refrigeration type chilled-mirror dew point hygrometer - Google Patents
Automatically controlled liquid nitrogen refrigeration type chilled-mirror dew point hygrometer Download PDFInfo
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- CN201740754U CN201740754U CN2010202522906U CN201020252290U CN201740754U CN 201740754 U CN201740754 U CN 201740754U CN 2010202522906 U CN2010202522906 U CN 2010202522906U CN 201020252290 U CN201020252290 U CN 201020252290U CN 201740754 U CN201740754 U CN 201740754U
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- liquid nitrogen
- dew point
- feedback control
- nitrogen refrigerating
- circuit feedback
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Abstract
The utility model belongs to the technical field of measurement, and relates to an automatically controlled liquid nitrogen refrigeration type chilled-mirror dew point hygrometer, which comprises a mirror dew point testing system and a liquid nitrogen refrigeration system, the liquid nitrogen refrigeration system comprises a circuit feedback control system, a position adjustor and a liquid nitrogen refrigerator, the circuit feedback control system receives and processes temperature and cooling rate data information coming from the mirror dew point testing system, and transmits adjustment instructions to the position adjustor, the position adjustor controls the position of the liquid nitrogen refrigerator and adjusts the depth of a heat-conducting rod immersed in liquid nitrogen, and thereby the temperature and cooling rate of the mirror dew point testing system are regulated and controlled. The instrument has the advantages of simple structure, convenient operation and quick refrigeration, and effectively shortens the instrument-balancing time and the measurement time, remarkably increases the testing operation efficiency, eliminates the affection of artificial factors and increases the accuracy of measurement results. The utility model is particularly suitable for high-intensity testing work, and can effectively decrease the labor intensity of testing work.
Description
One, technical field
The utility model belongs to the metrological testing technology field, relates to the psychrometry measuring technology, particularly liquid nitrogen refrigerating type dew point testing technology.
Two, background technology
Liquid nitrogen refrigerating type Cold Mirrors dew point hygrometer is a kind of gas dew point surveying instrument commonly used, the measuring equipment that the gas humidity field is most widely used, and it has the accuracy of measurement height, and measurement range is wide.In all conglomeraties such as gases at high pressure production, chemical industry manufacturing industry and war production scientific research and testing, application is arranged all, characteristics such as it is fast that it has measuring speed, and measurement range is wide.
The principle of work of existing liquid nitrogen refrigerating type dew point hygrometer is to utilize the low-temperature characteristics of liquid nitrogen to reach the purpose of quick reduction mirror temperature, thereby make steam coagulation in the tested gas to the dew point hygrometer minute surface, the detected light signal of infrared ray receiving sensor is changed, and the platinum resistance under the minute surface records the dew point temperature value of gas at this moment.Because the ability of liquid nitrogen refrigerating is strong, the measurement range of liquid nitrogen refrigerating type dew point hygrometer is wide, and especially advantage is bigger in low dew point testing.Existing liquid nitrogen refrigerating type dew point hygrometer adopts filling liquid nitrogen mode, controls physical construction (structure as shown in Figure 1) control refrigeration and measuring process manually, and the degree of association degree of measurement result and gauger's skill level is than higher.
Aspect the automatic control of liquid nitrogen refrigerating type dew point hygrometer, do not appear in the newspapers.
Three, summary of the invention
The utility model is a purpose to improve automation equipment degree and accuracy of measurement, and a kind of liquid nitrogen refrigerating type dew point hygrometer that can control automatically is provided.
The purpose of this utility model is to realize like this, data messages such as the cooling rate that is recorded by sensor and the intensity of freezing are gathered and handled to employing circuit feedback control system in real time, driving refrigerating plant by apparatus for adjusting position moves, regulate the degree of depth that heat conductive rod immerses liquid nitrogen, the control cooling rate, thus reach the purpose of measurement gas dew point quick and precisely.
What the utility model related to can control the liquid nitrogen refrigerating type dew point hygrometer automatically, form by minute surface dew point measuring system and liquid nitrogen refrigerating system, it is characterized in that: described liquid nitrogen refrigerating system is by the circuit feedback control system, apparatus for adjusting position and liquid nitrogen refrigerating apparatus are formed, the circuit feedback control system receives and handles temperature and the cooling rate data message from the dew point measuring system, through data processing the position adjustments instruction is delivered to apparatus for adjusting position, and the position by apparatus for adjusting position control liquid nitrogen refrigerating apparatus, the degree of depth that the heat conductive rod 5 that adjusting links to each other with minute surface 6 immerses liquid nitrogen realizes adjusting and control to the temperature and the cooling rate of dew point measuring system; The circuit feedback control system has measurement result Presentation Function (structure as shown in Figure 2) concurrently.
What the utility model related to can control the liquid nitrogen refrigerating type dew point hygrometer automatically, form by minute surface dew point measuring system and liquid nitrogen refrigerating system, it is characterized in that: described apparatus for adjusting position is made up of stepper motor 13, transmission shaft 2 and pallet 3, the regulating command that stepper motor 13 receives from the circuit feedback control system, drive pallet 3 by transmission shaft 2 and move, realize heat conductive rod 5 is immersed the adjusting of the liquid nitrogen degree of depth.
The utility model relates to, and can to control liquid nitrogen refrigerating type Cold Mirrors dew point hygrometer automatically simple in structure, easy to operate, the amount of movement of control heat conductive rod is given full play to the liquid nitrogen cryogenics characteristic in real time, and refrigeration is fast, effectively shorten instrument equilibration time and Measuring Time, significantly improve test job efficient.When can effectively avoid the loaded down with trivial details of manual adjustments, eliminate artificial factor, improve the accuracy of measurement result with fatigue.Be specially adapted to the high strength test job, effectively reduce test job labour intensity.
Four, description of drawings
Accompanying drawing is being used liquid nitrogen refrigerating type dew point hygrometer structural representation for 1 one kinds
Accompanying drawing can be controlled liquid nitrogen refrigerating type dew point hygrometer structural representation for 2 one kinds automatically
Accompanying drawing 3 can be controlled liquid nitrogen refrigerating type dew point hygrometer sensor construction synoptic diagram automatically
Accompanying drawing can be controlled liquid nitrogen refrigerating type dew point hygrometer structural representation for 4 one kinds automatically
The 1-manual knob; The 2-transmission shaft; The 3-pallet; 4-Dewar container for liquefied nitrogen bottle; The 5-heat conductive rod; The 6-minute surface; The 7-dew point hygrometer is measured cavity; 8-measures and display system; The 9-platinum-resistance thermometer; 10-heat conductive rod pedestal; The 11-photoelectron emission device; The 12-photoelectric receiving arrangement; The 13-stepper motor; 14-hydro-test lifting table; 15 circuit feedback control systems
Five, specific embodiments
Below in conjunction with specific embodiment the technical scheme that the utility model relates to is described in further details, but, anyly can realize stationkeeping and realize that according to instruction self-regulating scheme all constitutes a part of the present utility model not as the utility model being related to the restriction of technical scheme.
Embodiment one
A kind ofly can control the liquid nitrogen refrigerating type dew point hygrometer automatically, the dew point hygrometer structure as shown in Figure 2, minute surface dew point measuring system is as shown in Figure 3.Minute surface dew point measuring system is made up of the circular minute surface 6 of diameter 1cm, the accurate platinum resistance 9 of PT100, photoelectron emission device 11, photoelectric receiving arrangement 12, dew point hygrometer measurement cavity 7 and the display system of surface plating germanium rhodium alloy, minute surface 6 reliably is connected with copper rod as the diameter 0.5cm of heat conductive rod 5 by copper heat conductive rod pedestal 10, and platinum resistance 9 is imbedded minute surface 6.Apparatus for adjusting position is made up of 30W stepper motor 13, gearing shaft 2 and pallet 3, and pallet is fixed on the gearing shaft, and stepper motor driven gear transmission shaft is realized the position adjustment of pallet; Place on the pallet as the Dewar container for liquefied nitrogen bottle is stable with 250ml stainless-steel vacuum thermos cup.
Circuit feedback control system 15 is the Single Chip Microcomputer (SCM) system of initialize data handling procedure, and this system receives and handles from measuring system temperature and cooling rate data message, sends to stepper motor according to data processed result and regulates and steering order; The double measuring system display of doing of PC.
During use, the manual adjustment tray position, make heat conductive rod near but do not contact liquid nitrogen, fixed tray; In vacuum cup, inject liquid nitrogen; Start Measurement and Control System, stepper motor driven gear transmission shaft is adjusted tray position makes heat conductive rod 5 insertion liquid nitrogen lower the temperature to minute surface.Mirror temperature is measured and extracted to circuit feedback control system 15 in real time by platinum-resistance thermometer 9, send instruction through the initialize data disposal system to stepper motor 13, driven gear transmission shaft 2 rotates and makes pallet 3 do the lifting of expection, by adjusting the control that hot pin 5 immerses the degree of depth realization cooling rate of liquid nitrogen, measure thereby carry out the minute surface dew point.
This dew point hygrometer feeds back to control system by the rate of temperature fall that collects by circuit feedback control system control step formula motor, the control signal of real time altering stepper motor again, thereby the perfect condition that makes instrument reach automatic control, measure automatically.Measurement range-120 ℃～+ 20 ℃, measuring accuracy ± 2 ℃, the relative manual adjustments of equilibration time is measured and is shortened 40%.
Embodiment two
A kind of liquid nitrogen refrigerating type dew point hygrometer of can controlling automatically adopts small-sized hydraulic test lifting table as apparatus for adjusting position (structure is seen accompanying drawing 4), the Dewar container for liquefied nitrogen bottle is stable to be placed on the pallet, the hydro-test lifting table is accurately controlled by the circuit feedback control system, and all the other are with embodiment one.
This dew point hygrometer measurement range-120 ℃～+ 20 ℃, measuring accuracy ± 2 ℃, the relative manual adjustments of equilibration time is measured and is shortened nearly 50%.
The dew point hygrometer that this example relates to when adopting the higher measurement sensor-based system of precision, can obtain higher measuring accuracy.
Claims (2)
1. can control the liquid nitrogen refrigerating type dew point hygrometer automatically for one kind, form by minute surface dew point testing system and liquid nitrogen refrigerating system, it is characterized in that: described liquid nitrogen refrigerating system is by circuit feedback control system (15), apparatus for adjusting position and liquid nitrogen refrigerating apparatus are formed, the circuit feedback control system receives and handles temperature and the cooling rate data message from the dew point testing system, through data processing the position adjustments instruction is delivered to apparatus for adjusting position, and the position by apparatus for adjusting position control liquid nitrogen refrigerating apparatus, regulate the degree of depth of heat conductive rod (5) the immersion liquid nitrogen that links to each other with minute surface (6), realize adjusting and control the temperature and the cooling rate of dew point testing system; Circuit feedback control system (15) has the test result Presentation Function concurrently.
2. what claim 1 related to can control the liquid nitrogen refrigerating type dew point hygrometer automatically, form by minute surface dew point testing system and liquid nitrogen refrigerating system, it is characterized in that: described apparatus for adjusting position is made up of stepper motor (13), transmission shaft (2) and pallet (3), stepper motor (13) receives the regulating command from the circuit feedback control system, drive pallet (3) by transmission shaft (2) and move, regulate the degree of depth that heat conductive rod (5) immerses liquid nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202522906U CN201740754U (en) | 2010-07-08 | 2010-07-08 | Automatically controlled liquid nitrogen refrigeration type chilled-mirror dew point hygrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202522906U CN201740754U (en) | 2010-07-08 | 2010-07-08 | Automatically controlled liquid nitrogen refrigeration type chilled-mirror dew point hygrometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201740754U true CN201740754U (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202522906U Expired - Fee Related CN201740754U (en) | 2010-07-08 | 2010-07-08 | Automatically controlled liquid nitrogen refrigeration type chilled-mirror dew point hygrometer |
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| Country | Link |
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| CN (1) | CN201740754U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849313A (en) * | 2015-04-10 | 2015-08-19 | 北京兴迪仪器有限责任公司 | Design of chilled mirror method dew point instrument base structure |
| CN105424751A (en) * | 2015-12-23 | 2016-03-23 | 天津市泓诚泰科技发展有限公司 | Super-low-humidity chilled mirror dew point meter, refrigeration device and refrigeration method therefor |
-
2010
- 2010-07-08 CN CN2010202522906U patent/CN201740754U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849313A (en) * | 2015-04-10 | 2015-08-19 | 北京兴迪仪器有限责任公司 | Design of chilled mirror method dew point instrument base structure |
| CN105424751A (en) * | 2015-12-23 | 2016-03-23 | 天津市泓诚泰科技发展有限公司 | Super-low-humidity chilled mirror dew point meter, refrigeration device and refrigeration method therefor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110209 Termination date: 20150708 |
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| EXPY | Termination of patent right or utility model |