CN211121525U - Calibration device for environment inaccessible liquid level meter - Google Patents
Calibration device for environment inaccessible liquid level meter Download PDFInfo
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- CN211121525U CN211121525U CN201921992361.3U CN201921992361U CN211121525U CN 211121525 U CN211121525 U CN 211121525U CN 201921992361 U CN201921992361 U CN 201921992361U CN 211121525 U CN211121525 U CN 211121525U
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- level meter
- liquid level
- inflation
- pressure
- calibration device
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Abstract
An environment inaccessible liquid level meter calibration device comprises a liquid level meter, wherein the left side of the liquid level meter is a negative pressure side, the right side of the liquid level meter is a positive pressure side, the liquid level meter is connected with an isolation diaphragm through a capillary tube, the isolation diaphragm is connected with a pipeline tee joint, and the pipeline tee joint is also connected with an inflation joint A and a stop valve; the pressure-stabilizing inflation part comprises a compressed air tank, the compressed air tank is connected with an air pressure regulating valve, the air pressure regulating valve is connected with an inflation connector B, and the inflation connector B can be connected with the inflation connector A. The stop valve is connected with the valve switch extension rod.
Description
Technical Field
This utility model relates to a calibration equipment field, concretely relates to environment can not reach level gauge calibration equipment.
Background
In nuclear power plants or other industrial fields, a differential pressure level gauge is a commonly used water level measuring instrument. The principle of the differential pressure liquid level meter is that the pressure difference of positive pressure and negative pressure is measured by the liquid level meter, and the pressure difference is converted into a specific liquid level value through liquid density.
In order to measure the pressure difference, positive and negative pressure measurements of the level gauge need to be connected to the bottom and upper part of the container or tank, respectively. In order to verify the accuracy of the liquid level meter in the operation process, the liquid level meter needs to be verified regularly, but the instrument pipeline of some liquid level meters is an undetachable capillary tube, and the position of an isolation diaphragm at the tail end of the capillary tube is often inaccessible, so that the verification work of the instrument is difficult to carry out.
For solving the difficult problem, the utility model designs an one set of device, the device are used for the built-in level gauge check-up of reloading water tank of nuclear power station. Meanwhile, a calibration method of the instrument is extracted according to the device, and the safe and convenient calibration of the liquid level meter can be realized through the method.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the safety and convenience calibration of the liquid level meter of the built-in refueling water tank of the nuclear power station is realized, and a calibration device of the liquid level meter in a similar environment is provided.
The technical scheme of the utility model as follows: an environment inaccessible liquid level meter calibration device comprises a liquid level meter, wherein the left side of the liquid level meter is a negative pressure side, the right side of the liquid level meter is a positive pressure side, the liquid level meter is connected with an isolation diaphragm through a capillary tube, the isolation diaphragm is connected with a pipeline tee joint, and the pipeline tee joint is also connected with an inflation joint A and a stop valve;
the pressure-stabilizing inflation part comprises a compressed air tank, the compressed air tank is connected with an air pressure regulating valve, the air pressure regulating valve is connected with an inflation connector B, and the inflation connector B can be connected with the inflation connector A.
The stop valve is connected with the valve switch extension rod.
And a barometer is arranged on a connecting pipeline between the air pressure regulating valve and the inflation connector B.
The utility model discloses a show the effect and lie in: the utility model discloses a calibration equipment and refine a calibration method from this, can accomplish not disturb the level gauge operation when normal operating, need not get into the pond bottom and check-up when maintaining, realize that the safety of instrument check-up work is simple and convenient.
Drawings
FIG. 1 is a schematic diagram of an environmental unreachable level meter calibration apparatus;
FIG. 2 is a schematic view of a pressure stabilizing and inflating part of the environment inaccessible liquid level meter calibration device;
FIG. 3 is a front view of a pressure stabilizing and inflating portion of the environment inaccessible level meter verification device;
in the figure: the device comprises an inflation connector A1, a capillary tube 2, an isolation diaphragm 3, a pipeline three-way connector 4, a stop valve 5, a valve switch extension rod 6, a cover plate 7, a liquid level meter 8 and a horizontal plane 9;
a compressed air tank 11, an air pressure regulating valve 12, an inflation connector B13 and an air pressure gauge 14;
Detailed Description
As shown in figure 1, the environment inaccessible level meter calibration device comprises a level meter 8, wherein the left side of the level meter 8 is a negative pressure side, the right side of the level meter 8 is a positive pressure side, the level meter is connected with an isolation diaphragm 3 through a capillary tube 2, the isolation diaphragm 3 is connected with a pipeline three-way joint 4, the pipeline three-way joint 4 is also connected with an inflation joint A1 and a stop valve 5, the stop valve 5 is connected with a valve switch extension rod 6,
and a pressure-stabilizing inflation part, as shown in fig. 2, which comprises a compressed air tank 11, wherein the compressed air tank 11 is connected with an air pressure regulating valve 12, the air pressure regulating valve 12 is connected with an inflation connector B13, an air pressure gauge 14 is arranged on a connecting line of the air pressure regulating valve 12 and the inflation connector B13, and the inflation connector B13 can be connected with the inflation connector A1.
The working steps are as follows:
1) connecting an air charging connector B13 of the pressure stabilizing air charging part with an air charging connector A1;
2) slowly opening the air pressure regulating valve 12, and monitoring the inflation pressure through a barometer 14;
3) starting to charge the charging connector B13 and discharging water in the pipeline;
4) after the air is continuously filled for 2 minutes, the stop valve 5 is closed, and the air pressure regulating valve 12 is closed;
and reading a pressure value through the barometer 14, maintaining the pressure for 2 minutes, wherein if the pressure does not drop, the pressure maintaining is successful, and otherwise, checking whether the pipeline connection part has leakage or not and removing the leakage.
5) After the pressure maintaining is successful, the connection between the inflation connector B13 and the inflation connector A1 is broken,
6) connect instrument calibration equipment to inflation joint A1, calculate pressure correction value to carry out the check-up work according to pressure correction value, because the place of suppressing of this device is located apron 7, normal check-up flow need suppress at the bottom of the pool, suppress the position difference and produced certain pressure differential, this partial pressure differential is produced by the air gravity that h meters is high, pressure correction calculation: Δ P is ρ gh.
7) The connection of the meter verification device to the charging connection a1 is disconnected and the shut-off valve 5 is opened.
Analyzing errors;
the range of the liquid level meter with the built-in refueling water tank is 0-3.8 m of water, and the differential pressure range is 0-32.83 KPa.
Because the pressing place of the device is positioned on the cover plate 7, the normal checking process needs to be performed on the bottom of the pool. Because the different positions of the pressing produce a certain pressure difference, which is caused by the gravity of 3.8m of air.
The density of air is 1.205Kg/m3 at one atmosphere pressure and 20 ℃ ambient temperature, the gravity acceleration is 9.80665m/s2, and the height h can be adjusted according to actual conditions, and the height in the example is 3.8 m.
The error pressure is: Δ P ═ ρ gh ═ 1.205 ═ 9.80665 ═ 3.8 ═ 44.90 Pa;
percent error relative to instrument differential pressure range: 44.90/32.83 × 1000 × 100% ═ 0.137%;
the error is small, can be eliminated by compensating 44.90Pa pressure during verification, and can also be directly ignored.
Claims (4)
1. The utility model provides an environment can not reach level gauge calibration equipment which characterized in that: the liquid level meter comprises a liquid level meter (8) which is connected with an isolation diaphragm (3) through a capillary tube (2), the isolation diaphragm (3) is connected with a pipeline three-way joint (4), and the pipeline three-way joint (4) is also connected with an inflation joint A (1) and a stop valve (5);
the pressure-stabilizing inflation part comprises a compressed air tank (11), the compressed air tank (11) is connected with an air pressure regulating valve (12), the air pressure regulating valve (12) is connected with an inflation connector B (13), and the inflation connector B (13) can be connected with the inflation connector A (1).
2. The environmental inaccessible level meter calibration device according to claim 1, characterized in that: the stop valve (5) is connected with a valve switch extension rod (6).
3. The environmental inaccessible level meter calibration device of claim 2, wherein: and a barometer (14) is arranged on a connecting pipeline of the air pressure regulating valve (12) and the inflation connector B (13).
4. The environmental inaccessible level meter calibration device according to claim 1, characterized in that: the left side of the liquid level meter (8) is a negative pressure side, and the right side is a positive pressure side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921992361.3U CN211121525U (en) | 2019-11-18 | 2019-11-18 | Calibration device for environment inaccessible liquid level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921992361.3U CN211121525U (en) | 2019-11-18 | 2019-11-18 | Calibration device for environment inaccessible liquid level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211121525U true CN211121525U (en) | 2020-07-28 |
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ID=71692555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921992361.3U Active CN211121525U (en) | 2019-11-18 | 2019-11-18 | Calibration device for environment inaccessible liquid level meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211121525U (en) |
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2019
- 2019-11-18 CN CN201921992361.3U patent/CN211121525U/en active Active
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