CN210862836U - Device for checking electric contact water level gauge - Google Patents
Device for checking electric contact water level gauge Download PDFInfo
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- CN210862836U CN210862836U CN201922043974.9U CN201922043974U CN210862836U CN 210862836 U CN210862836 U CN 210862836U CN 201922043974 U CN201922043974 U CN 201922043974U CN 210862836 U CN210862836 U CN 210862836U
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- level gauge
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Abstract
The utility model relates to an automatic change instrument field. A device for verifying an electric contact water level gauge comprises a checker and the water level gauge, wherein the checker comprises 17 or 19 groups of resistance elements, each group of resistance elements is connected with a selection switch in series, each group of resistance elements is connected with the selection switch in parallel, and the 17 or 19 groups of resistance elements respectively represent 17 or 19 water sites; the calibrator is electrically connected with the water level meter through a cable. The electric contact water level gauge calibration device is very convenient and simple in practical use, has a simple structure, and does not need an external power supply or any other auxiliary equipment.
Description
Technical Field
The utility model relates to an automatic change instrument field.
Background
During daily operation, when the water level measurement fails, the electric contact water level gauge needs to be verified to confirm whether the cable and the water level gauge fail. The traditional checking method is that a fault point (or each water level electrode) is in short circuit with a public line by using a short circuit on a field on-site measuring cylinder, so that the resistance value of the electrode is zero, the electrode is simulated to be immersed in the water level of a steam drum, meanwhile, whether the diode of a water level gauge turns green or not is observed, if the diode turns green, the point is in good condition, and if the diode turns red, the point is in fault. However, this checking method is performed by setting the water resistance value to zero ohm, and water actually has a certain resistance value and changes continuously, so that when the circuit has a certain resistance value, it is not necessary to display whether the diode of the meter turns green, and therefore, this checking method has certain defects.
In order to simulate the actual situation of a field, a resistor combination can be designed, and the change of the resistance of steam and water can be replaced by the change of the resistance, so that the display meter of the water level gauge changes along with the change of the resistance. According to the design thought, a device for verifying the electric contact water level gauge is designed.
SUMMERY OF THE UTILITY MODEL
As one of three safety accessories of a boiler drum of a thermal power plant, the electric contact water level gauge plays a vital role in the safe operation of the boiler. The working principle is that the difference of the electric conductivity of the electrodes immersed in water and exposed in steam is utilized to measure the water level, a red-green bicolor diode is used for simulating the bicolor display of steam (red) water (green), and the LED numerical value is used for displaying the position of the steam drum water level. The whole set of instrument comprises a primary measuring cylinder and a secondary measuring and controlling instrument, and has the advantages of simple structure, visual display, reliable operation, small maintenance amount, intelligence, intelligent auxiliary judgment and the like.
The utility model aims at providing a device of check-up electric contact fluviograph to above-mentioned problem exactly. An average value is obtained by measuring the actual vapor and water resistance values of the site for multiple times, the most approximate resistance is selected by taking the average value as the reference, and the vapor and water resistance values are respectively replaced to simulate the vapor and water resistance value changes of the site.
The purpose of the utility model is realized like this: a device for verifying an electric contact water level gauge comprises a checker and the water level gauge, wherein the checker comprises 17 or 19 groups of resistance elements, each group of resistance elements is connected with a selection switch in series, each group of resistance elements is connected with the selection switch in parallel, and the 17 or 19 groups of resistance elements respectively represent 17 or 19 water sites; the calibrator is electrically connected with the water level meter through a cable.
Furthermore, each group of resistance elements comprises two resistors with different resistance values, and the two resistors with different resistance values respectively represent a water resistance and a steam resistance.
Further, the 19 water level points are respectively 0mm, ± 15mm, ± 30mm, ± 50mm, ± 75mm, ± 100mm, ± 150mm, ± 175mm, ± 200mm, ± 250 mm.
Further, the 17 water level points are respectively 0mm, ± 15mm, ± 30mm, ± 50mm, ± 75mm, ± 100mm, ± 150mm, ± 175mm, ± 200 mm.
Furthermore, the water level meter is a two-color electric contact water level meter.
Further, the resistor element and the selection switch of the checker are fixed on a circuit board.
The utility model has the advantages that:
(1) the electric contact water level gauge calibration device is very convenient and simple in practical use, has a simple structure, and does not need an external power supply or any other auxiliary equipment.
(2) The device is not limited by areas, can be used in standard rooms, and can also be used on site.
(3) The water quality of different processes can be used (namely, the water resistance change range of the process is actually measured to select corresponding resistance components to manufacture the calibrator suitable for the process), and the application range is wide.
Since 2015, the water level meter with more than 50 sets of electric contacts is verified by using the calibrator, and the using effect is excellent.
In view of the advantages, the device for verifying the electric contact water level gauge is suitable for popularization and application.
Drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a conventional verifying electric contact water level gauge.
Fig. 2 is a diagram of the verifier used in laboratory tests.
FIG. 3 is a diagram of the verifier used in the field for in situ testing.
Fig. 4 is a circuit diagram of the checker of the present invention.
Wherein: 1. the system comprises a steam drum, 2, a measuring cylinder, 3, a public line, 4, a water level line, 5, a short-circuit line, 6, a water level meter, 7, an on-site area, 8, a monitoring room area, 9, a calibrator, 10, a two-color water level meter, 11, a signal cable, 12, a steam drum water level meter platform, 13, a monitoring room, 14, a selector switch, 15, a steam resistor and 16, wherein the steam meter is connected with the water level meter through the short-circuit line.
Detailed Description
The traditional method for checking the electric contact water level gauge is carried out by setting the water resistance value to be zero ohm, and actually, water has a certain resistance value and changes continuously, so that when the circuit has a certain resistance value, whether the diode of the display gauge turns green or not is not necessary, and therefore, the checking method has certain defects. The novel tester designed by the inventor can completely simulate the change of the actual water resistance, overcomes the defects of the traditional checking method, obtains an average value by measuring the actual vapor and water resistance values on site for many times, selects the closest resistance by taking the average value as the reference, and respectively replaces the vapor and water resistance values to simulate the change of the vapor and water resistance values on site. The device is very convenient and simple in practical use, has a simple structure, and does not need a power supply or any other auxiliary equipment; the device is not limited by regions, can be used in a standard room, and can also be used on site; the water quality of different processes can be used (namely, the water resistance change range of the process is actually measured to select corresponding resistance components to manufacture the calibrator suitable for the process), and the application range is wide.
The following description is made with reference to the accompanying drawings:
the checker is composed of 19 groups of resistance elements and 19 selection switches, and respectively represents 19-point (0 mm, ± 15mm, ± 30mm, ± 50mm, ± 75mm, ± 100mm, ± 150mm, ± 175mm, ± 200mm, ± 250 mm) water levels, and 17 groups of resistances can also be selected to represent 17-point water levels (0 mm, ± 15mm, ± 30mm, ± 50mm, ± 75mm, ± 100mm, ± 150mm, ± 175mm, ± 200 mm). Each group of resistors has two resistors with different resistance values (here, 60K omega and 2M omega resistors are selected to represent water resistance and steam resistance respectively according to the practical situation of our factory production). The lead of the calibrator is connected with a terminal of the water level gauge, the water resistance is sequentially connected through the selection switch, and whether the diode corresponding to the electric contact water level gauge is green and bright or not is observed, otherwise, the diode of the water level gauge is green and bright. The calibrator can also be carried to a site position (namely an electric contact measuring cylinder) to be connected with a corresponding signal cable, and then the water level meter is calibrated, and the operation method is consistent with the operation method. The water level can be verified no matter in the re-operation state or in the blowing-out state. Before the water resistance calibrator is used specifically, a user can actually measure the water resistance change range of the technology to select a corresponding resistance component to manufacture the calibrator adaptive to the user.
Selecting 19 60 Komega, 19 2 Momega resistors and 19 two-position switches, assembling according to a checker schematic diagram, fixing on a panel (for beauty and convenience, we select a pressure meter shell with the diameter of 150 mm), then connecting each group of resistors and selection switches according to the checker schematic diagram by using signal wires, simultaneously leading out the signal wires and the common wires of each point, wherein the length of each signal wire is about 500mm, and then marking each group of resistors according to the sequence of a water level gauge, thus finishing the manufacture of the checker. And finally, switching each group of selection switches between water and steam resistors, and simultaneously detecting whether the loop is connected and whether the resistance value is correct by using a universal meter. After all the checks are normal, the water level gauge can be calibrated.
Further speaking:
1. the calibration device has two resistance elements with different resistance values to respectively simulate the steam resistance and the water resistance of a medium to be tested on site. The check meter can change the resistance value according to the actual condition of the check meter.
2. The water level variation can be simulated by selecting different combinations of resistor elements by using a selection switch.
3. The structure is simple, and any other power supply or accessories are not needed.
4. Is not limited by areas and can be used in the field or any place such as a standard room. (except for the explosion-proof area).
The above description is only for the specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.
Claims (6)
1. A device for verifying an electric contact water level gauge is characterized in that: the water level meter comprises a checker and a water level meter, wherein the checker comprises 17 or 19 groups of resistance elements, each group of resistance elements is connected with a selection switch in series, each group of resistance elements is connected with the selection switch in parallel, and the 17 or 19 groups of resistance elements respectively represent 17 or 19 water sites; the calibrator is electrically connected with the water level meter through a cable or a lead.
2. An apparatus for verifying an electrical contact water level gauge as claimed in claim 1, wherein: each group of resistance elements comprises two resistors with different resistance values, and the two resistors with different resistance values respectively represent a water resistance and a steam resistance.
3. An apparatus for verifying an electrical contact water level gauge as claimed in claim 1, wherein: the 19 water level points are respectively 0mm, ± 15mm, ± 30mm, ± 50mm, ± 75mm, ± 100mm, ± 150mm, ± 175mm, ± 200mm, ± 250 mm.
4. An apparatus for verifying an electrical contact water level gauge as claimed in claim 1, wherein: the 17 water level points are respectively 0mm, ± 15mm, ± 30mm, ± 50mm, ± 75mm, ± 100mm, ± 150mm, ± 175mm, ± 200 mm.
5. An apparatus for verifying an electrical contact water level gauge as claimed in claim 1, wherein: the water level meter is a two-color electric contact water level meter.
6. An apparatus for verifying an electrical contact water level gauge as claimed in claim 1, wherein: the resistor element and the selection switch of the checker are fixed on a circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922043974.9U CN210862836U (en) | 2019-11-25 | 2019-11-25 | Device for checking electric contact water level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922043974.9U CN210862836U (en) | 2019-11-25 | 2019-11-25 | Device for checking electric contact water level gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210862836U true CN210862836U (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922043974.9U Active CN210862836U (en) | 2019-11-25 | 2019-11-25 | Device for checking electric contact water level gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210862836U (en) |
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2019
- 2019-11-25 CN CN201922043974.9U patent/CN210862836U/en active Active
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