CN2869801Y - Liquid-level measuring instrument - Google Patents
Liquid-level measuring instrument Download PDFInfo
- Publication number
- CN2869801Y CN2869801Y CN 200520107035 CN200520107035U CN2869801Y CN 2869801 Y CN2869801 Y CN 2869801Y CN 200520107035 CN200520107035 CN 200520107035 CN 200520107035 U CN200520107035 U CN 200520107035U CN 2869801 Y CN2869801 Y CN 2869801Y
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- Prior art keywords
- probe
- pressure
- measuring instrument
- liquid level
- signal
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- Expired - Fee Related
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to a metering device technology field, an instrument that is used to measure the liquid level, in particular to the high temperature wide range liquid level. In the utility model, the metal enclosure is totally sealed. The pressure signal detected by a pressure gauge probe is linearly amplified via an operational amplification circuit board that is connected with the probe. The amplified signal is sent to the lower stage detection system via a processed signal line transmission. The operational amplification circuit board and the signal transmission line are positioned in the protecting tube and the metal enclosure, and is isolated from the measured liquid. And the pressure comparation end of the pick-up probe is communicated with the outer atmosphere all the time. The utility model can guarantee that the throw in type liquid level instrument has a structural sealing reliability, and guarantee that the pressure comparation end of the pick-up probe is communicated with the outer atmosphere at the same time. And accordingly, the high temperature wide range liquid level can be measured accurately.
Description
Affiliated technical field
The utility model relates to the technical field of measuring instrument, and specifically a kind of measuring liquid level that is used for is especially measured the instrument of high temperature wide range liquid level.
Background technology
Fluid level measuring instrument major part of the prior art is to be used on the industrial and bigger civilian pond, and fluid temperature is a normal temperature, and range is less than 20 meters environment.The kind of fluid level measuring instrument has pressure, machinery, ultrasound wave at present, resistance, types such as electric capacity, and use more widely, and what be useful for measurement wide range liquid level is throw-in type pressure liquid level meter, promptly drops into pressure transducer in liquid, and the mode of measuring its pressure converses the liquid level of liquid.
Existing pressure-type liquidometer is owing to adopt the mode of throw-in type to measure, therefore must immerse in the liquid by whole pressure transducer, and consider the variation of environment atmospheric pressure, the sensor internal probe must communicate with surface air, so can not take to seal fully to sensor.This type of sensor sealing at present all adopts elastomeric material extrusion type sealed, and that elastomeric material takes place under long-time stressed and environment that fluid temperature is higher easily is aging, make its sealing property actual effect, thereby cause pressure transducer inside to enter liquid and damage its electric property, make it can not normally measure liquid level.
Summary of the invention
The purpose of this utility model is exactly in order to overcome and to solve that to have the fluid level measuring instrument sealing property now unreliable, cause measuring unstable, can not accurately measure the shortcoming and the problem of high temperature wide range liquid level, and provide a kind of cost low, that easily realizes can be applicable to the measuring instrument of measuring high temperature wide range liquid level, especially is applied in the measurement of geothermal deep well liquid level.
The technical scheme that its technical matters that solves the utility model adopts is: metal shell is sealing fully, the pressure transducer probe detects pressure signal, carry out linear amplification through the operational amplification circuit plate that links to each other with this probe, the signal after amplifying by signal wire transmits is to the next stage detection system.Operational amplification circuit plate and signal transmssion line are arranged in protection tube and metal shell, isolate with measurement liquid, and the sensor probe pressure ratio communicate with outside atmosphere all the time than end.Structure mainly adopts thread seal.Between protection tube and the shell for crush seal, the protection tube material selection is high temperature resistant poly-tetrafluoro or high temperature resistant plastic-aluminum pipe.
The beneficial effects of the utility model are to guarantee that sensor probe comparative pressure end communicates with outside atmosphere, therefore can measure high temperature wide range liquid level accurately when high temperature and high pressure environment guarantees the sealing reliability of throw-in type liquid level instrument structure.
Description of drawings
Fig. 1 is a structure principle chart of the present utility model.
1. entrance pressure holes among the figure, 2. outside connecting thread, 3. sensor; 4. sensor probe; 5. protecting sheathing and sensor connecting thread, 6. sensor probe is connected lead with operational amplification circuit, 7. the operational amplification circuit plate; 8. protecting sheathing; 9. operational amplification circuit output signal line, 10. protecting sheathing be fastenedly connected a connecting thread, 11. are fastenedly connected head; 12. be fastenedly connected head and fastening nut connecting thread, 13. fastening springs.14. clamp nut, 15. protection tubes.
Embodiment
In Fig. 1, liquid enters sensor (3) inside from entrance pressure hole (1), sensor probe (4) contacts with liquid, measure fluid pressure, the output electric signal, operational amplification circuit plate (7) is connected lead (6) by sensor probe and receives this signal with operational amplification circuit, after the process calculation process becomes the signal of being convenient to long-distance transmissions of user's request, be delivered to the next stage signal processing system by operational amplification circuit output signal line (9) again.
Sensor probe (4) rear portion comparative pressure end communicates with external pressure by protecting sheathing (8), protection tube (15).
One-piece construction has 3 seal points: protecting sheathing and sensor connecting thread (5) are realized thread seal with protecting sheathing with being fastenedly connected a connecting thread (10), and fastening spring (13) is realized crush seal.Thread seal is the sealing between metal and the metal, so its sealing property can not be subjected to the influence of High Temperature High Pressure.And illustrated special seal mode has been adopted in crush seal; clamp nut (14) pushes fastening spring (13) and inwardly shrinks when screwing; therefore fastening spring (13) is more and more littler with a distance that is fastenedly connected between (11), so form crush seal between fastening spring (13) and the protection tube (15).Protection tube adopts resistant to elevated temperatures poly-four fluorine tube and plastic-aluminum pipe, has guaranteed the reliability of sealing property.
Claims (4)
1. fluid level measuring instrument, it is characterized in that metal shell is for sealing fully, the pressure transducer probe detects pressure signal, carries out linear amplification through the operational amplification circuit plate that links to each other with this probe, and the signal after amplifying by signal wire transmits is to the next stage detection system.
2. fluid level measuring instrument according to claim 1 is characterized in that sensor probe, and operational amplification circuit plate and signal transmssion line are arranged in protection tube and metal shell, isolate with measurement liquid, and the sensor probe pressure ratio communicates with outside atmosphere than end.
3. fluid level measuring instrument according to claim 1 and 2 is characterized in that structure mainly adopts thread seal.
4. fluid level measuring instrument according to claim 3, it is characterized in that between protection tube and the shell for crush seal, the protection tube material selection is high temperature resistant poly-tetrafluoro or high temperature resistant plastic-aluminum pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520107035 CN2869801Y (en) | 2005-08-19 | 2005-08-19 | Liquid-level measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520107035 CN2869801Y (en) | 2005-08-19 | 2005-08-19 | Liquid-level measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2869801Y true CN2869801Y (en) | 2007-02-14 |
Family
ID=37724741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520107035 Expired - Fee Related CN2869801Y (en) | 2005-08-19 | 2005-08-19 | Liquid-level measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2869801Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954824A (en) * | 2011-08-25 | 2013-03-06 | 江苏恩泰传感器有限公司 | Liquid level sensor |
| CN103512601A (en) * | 2012-06-26 | 2014-01-15 | 克罗内分析学有限责任公司 | Measuring device for determining a process variable |
| CN107153038A (en) * | 2017-06-08 | 2017-09-12 | 铁道第三勘察设计院集团有限公司 | Stratum osmotic coefficient quickly determines probe and its application method |
-
2005
- 2005-08-19 CN CN 200520107035 patent/CN2869801Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954824A (en) * | 2011-08-25 | 2013-03-06 | 江苏恩泰传感器有限公司 | Liquid level sensor |
| CN103512601A (en) * | 2012-06-26 | 2014-01-15 | 克罗内分析学有限责任公司 | Measuring device for determining a process variable |
| CN107153038A (en) * | 2017-06-08 | 2017-09-12 | 铁道第三勘察设计院集团有限公司 | Stratum osmotic coefficient quickly determines probe and its application method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070214 Termination date: 20090921 |