Phase modulation water level measuring device for pumped storage unit

Abstract

The utility model discloses a phase modulation water level measuring device of a pumped storage unit, which belongs to the technical field of phase modulation operation liquid level measuring equipment and comprises a high water level connecting pipe, a low water level connecting pipe, a first communicating pipe, a second communicating pipe, a real-time liquid level measuring piece and a tuning fork switch. The upper end of the first communicating pipe is communicated with the high-water-level connecting pipe and the upper end of the second communicating pipe, the lower end of the first communicating pipe is communicated with the low-water-level connecting pipe and the lower end of the second communicating pipe, the tuning fork switch is installed on the first communicating pipe, and the real-time liquid level measuring piece is installed on the second communicating pipe. The first communicating pipe is connected to a draft tube of the pumped storage unit through a high-water-level connecting pipe and a low-water-level connecting pipe to form a first communicating vessel structure, and the second communicating pipe is matched with the first communicating pipe to form a second communicating vessel structure. The technical problem that in the prior art, due to the fact that a floater is prone to impact deformation, measurement accuracy and reliability are limited is effectively solved, and the advantages of being high in measurement accuracy and reliability are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of phase - modulation operation liquid - level measuring equipment, and particularly relates to a phase - modulation water - level measuring device applied to a pumped - storage unit. Background Art

[0002] In the phase - modulation working condition of a pumped - storage unit, the water level in the draft tube is used as a key water - level signal, which is called the phase - modulation water level during the phase - modulation process. The accurate measurement and timely adjustment of the phase - modulation water level are crucial for realizing the optimal operation and efficient utilization of the unit. In actual operation, it is necessary to closely combine the specific conditions of the unit and the actual needs of the power grid to ensure the accuracy of the phase - modulation water level. This process aims to maintain the stable operation of the unit during phase - modulation and prevent vibrations, wear, and unstable conditions caused by water - level fluctuations. At the same time, by monitoring the phase - modulation water level, the unit state can be flexibly adjusted to ensure the timely transmission of the required reactive power to the power grid, effectively supporting the stability of the power - grid voltage and realizing the reliable operation of the power system.

[0003] For example, Chinese patent document with the publication number CN107063399B discloses a phase - modulation water - level sensor for pressure - reducing water. This technology uses a float and a magnetic flap to measure the liquid level, outputs a switching signal of a preset liquid level, and through the exhaust valve and the improved structure of the inlet and outlet of the phase - modulation water - level gauge for pressure - reducing water, it is convenient for the water inlet and exhaust of the water - level gauge, improving the indication reliability of the water - level gauge. However, during the phase - modulation water - return process of the pumped - storage unit, the phase - modulation water level often fluctuates violently. Under this condition, the float is vulnerable to impact during oscillation, and long - term operation is likely to cause deformation of the float. Therefore, in this technical solution, the measurement accuracy and reliability of the phase - modulation water level are still insufficient.

[0004] Therefore, it is necessary to design a new type of phase - modulation water - level measuring device for pumped - storage units to further improve the reliability and accuracy of the phase - modulation water - level measurement of pumped - storage units. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the above - mentioned problems existing in the prior art, and provides a phase - modulation water - level measuring device for a pumped - storage unit, effectively solving the technical problem that the measurement accuracy and reliability are limited due to the easy deformation of the float by impact in the prior art, and realizing a significant improvement in the measurement accuracy and reliability of the phase - modulation water level.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] A phase - modulation water level measuring device for a pumped - storage unit of the present utility model includes a high - water - level connecting pipe, a low - water - level connecting pipe, a first communicating pipe, a second communicating pipe, a real - time liquid - level measuring member, and a tuning fork switch for outputting a liquid - level digital signal. The first communicating pipe and the second communicating pipe are vertically arranged side by side. The upper end of the first communicating pipe is respectively communicated with the upper ends of the high - water - level connecting pipe and the second communicating pipe, and the lower end of the first communicating pipe is respectively communicated with the lower ends of the low - water - level connecting pipe and the second communicating pipe. The tuning fork switch is installed on the first communicating pipe, and the real - time liquid - level measuring member is installed on the second communicating pipe. The first communicating pipe is respectively connected to the draft tube of the pumped - storage unit through the high - water - level connecting pipe and the low - water - level connecting pipe to form a first communicating vessel structure, and the second communicating pipe cooperates with the first communicating pipe to form a second communicating vessel structure.

[0008] The number of the tuning fork switches is multiple. The multiple tuning fork switches are arranged at intervals along the height direction of the first communicating pipe, are detachably fixed on the pipe wall of the first communicating pipe, and the prongs of the tuning fork switches extend into the first communicating pipe.

[0009] The real - time liquid - level measuring member includes a guided - wave radar level gauge for outputting a liquid - level analog signal. The guided - wave radar level gauge is detachably fixed at the top of the second communicating pipe, and the waveguide rod of the guided - wave radar level gauge extends from the top of the second communicating pipe into the second communicating pipe and extends to the lower end.

[0010] The first communicating pipe and the second communicating pipe are of the same size.

[0011] The upper end of the first communicating pipe is communicated with the upper end of the second communicating pipe through an upper communicating pipe, and the lower end of the first communicating pipe is communicated with the lower end of the second communicating pipe through a lower communicating pipe. Both the upper communicating pipe and the lower communicating pipe are horizontally arranged.

[0012] An upper maintenance valve is installed in the middle of the high - water - level connecting pipe, and a lower maintenance valve is installed in the middle of the low - water - level connecting pipe.

[0013] The advantages of adopting the present utility model are as follows:

[0014] 1. In the present utility model, first, the first communicating pipe is respectively connected to the draft tube of the pumped - storage unit through the high - water - level connecting pipe and the low - water - level connecting pipe to form a first communicating vessel structure, and the second communicating pipe cooperates with the first communicating pipe to form a second communicating vessel structure. By installing the tuning fork switch on the first communicating pipe and the real - time liquid - level measuring member on the second communicating pipe, the present utility model forms a redundant design through the first communicating vessel structure and the second communicating vessel structure, improves the reliability of the phase - modulation water level measuring device of the present utility model, ensures the accuracy and reliability of the phase - modulation water level data, and provides an important reference basis for the operation of the pumped - storage unit.

[0015] Secondly, in the present utility model, by vertically installing the first connecting pipe and the second connecting pipe in parallel, and respectively arranging a tuning fork switch and a real-time liquid level measuring component on the first connecting pipe and the second connecting pipe, compared with installing the tuning fork switch and the real-time liquid level measuring component in a single connecting pipe, it has significant advantages. This design avoids the problem that the single connecting pipe has to increase the pipe diameter due to accommodating the tuning fork switch and the real-time liquid level measuring component at the same time, thereby reducing the weight of the connecting pipe, reducing the demand for the supporting parts of the connecting pipe, and effectively saving the space occupation.

[0016] Moreover, compared with the prior art represented by the Chinese patent document "CN107063399B", the technical solution of the present utility model cancels the float design in the prior art, avoids the technical problems that the measurement accuracy and reliability of the phase modulation water level are limited due to the easy impact deformation of the float, significantly improves the measurement accuracy of the phase modulation water level and the reliability of long-term operation, and ensures the reliable operation of the power system.

[0017] 2. In the present utility model, by installing multiple tuning fork switches on the first connecting pipe and making each tuning fork switch correspond to a preset alarm water level, when the water level reaches any preset alarm water level, the corresponding tuning fork switch can quickly respond and output a liquid level switch quantity signal, ensuring that the phase modulation water level measuring device of the present utility model can accurately respond to the requirements of different preset alarm water levels, improving the flexible adaptability of the present utility model. Combined with the design of the guided wave radar level gauge, it can accurately measure and output the liquid level analog quantity signal in real time; further, the present utility model utilizes the dual advantages of the tuning fork switch and the guided wave radar level gauge, improves the response speed and anti-electromagnetic interference ability of the measurement signal, significantly improves the measurement accuracy and reliability, and provides a strong guarantee for the stable operation of the pumped storage unit.

[0018] 3. In the present utility model, the design of making the first connecting pipe and the second connecting pipe have the same size makes the entire measuring device more unified and coordinated in structure, which is beneficial to reducing the fluid resistance or water level measurement error that may be brought by the size difference between the first connecting pipe and the second connecting pipe.

[0019] 4. In the present utility model, the design of connecting the upper ends of the first connecting pipe and the second connecting pipe through an upper connecting pipe, connecting the lower ends of the first connecting pipe and the second connecting pipe through a lower connecting pipe, and both the upper connecting pipe and the lower connecting pipe are horizontally arranged fully follows the principle of the communicating vessel. As the water level rises, the excess air in the second connecting pipe is released to the upper end of the first connecting pipe through the upper connecting pipe and is finally discharged through the high water level connecting pipe and returns to the tail water pipe of the pumped storage unit. On the contrary, when the water level drops, the air enters through the high water level connecting pipe, and the water flow is discharged from the low water level connecting pipe, further ensuring the water level balance of the entire device and the accuracy of water level measurement.

[0020] 5. In the present utility model, by installing an upper maintenance valve in the middle of the high water level connecting pipe and a lower maintenance valve in the middle of the low water level connecting pipe, when it is necessary to maintain the measuring device, the upper maintenance valve and the lower maintenance valve can be closed to cut off the water flow, ensuring the convenience of the water level measuring device during maintenance work. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the present utility model.

[0022] The reference numerals in the figure are: 1. tuning fork switch, 2. real-time liquid level measuring element, 201. guided wave radar level gauge, 3. upper maintenance valve, 4. lower maintenance valve, 5. first connecting pipe, 6. upper connecting pipe, 7. second connecting pipe, 8. high water level connecting pipe, 9. low water level connecting pipe, 10. fixed pipe clamp, 11. lower connecting pipe. Detailed Embodiment

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. For the convenience of description, the relative positional relationships of the components are all described according to the layout of the drawings in the specification. For example, the positional relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the drawings in the specification.

[0024] A phase - modulation water level measuring device for a pumped - storage unit of the present utility model includes a high - water - level connecting pipe 8, a low - water - level connecting pipe 9, a first communicating pipe 5, a second communicating pipe 7, a real - time liquid - level measuring member 2, and a tuning fork switch 1 for outputting a liquid - level digital signal. Specifically, the first communicating pipe 5 and the second communicating pipe 7 are installed vertically side by side. To ensure the stable installation of the first communicating pipe 5 and the second communicating pipe 7, pipe clamps 10 can be welded to the pipe walls of the first communicating pipe 5 and the second communicating pipe 7, and then the pipe clamps 10 are firmly fixed to the pit wall by using expansion anchor bolts in a reliable manner, thereby realizing the stable support of the phase - modulation water level measuring device of the present utility model for the pumped - storage unit. The upper end of the first communicating pipe 5 is respectively communicated with the upper end of the high - water - level connecting pipe 8 and the upper end of the second communicating pipe 7, and the lower end of the first communicating pipe 5 is respectively communicated with the lower end of the low - water - level connecting pipe 9 and the lower end of the second communicating pipe 7. The tuning fork switch 1 is installed on the first communicating pipe 5 to measure the water level in the first communicating pipe 5, and the real - time liquid - level measuring member 2 is installed on the second communicating pipe 7 to measure the water level in the second communicating pipe 7. The first communicating pipe 5 is respectively connected to the draft tube of the pumped - storage unit through the high - water - level connecting pipe 8 and the low - water - level connecting pipe 9 to form a first communicating vessel structure, and the second communicating pipe 7 cooperates with the first communicating pipe 5 to form a second communicating vessel structure. The first communicating vessel structure and the second communicating vessel structure form a redundant structure design, ensuring the reliability of water - level measurement of the present utility model. In addition, the specific connection positions of the high - level phase - modulation water - level connecting pipe 8 and the low - level phase - modulation water - level connecting pipe 9 on the draft tube need to be determined according to the preset phase - modulation water level of the pumped - storage unit and follow the principle of the communicating vessel to ensure that the change of the phase - modulation water level in the draft tube can be measured comprehensively and accurately.

[0025] Based on the principle of the communicating vessel, the phase - modulation water level in the draft tube of the pumped - storage unit is the same as the water levels in the first communicating pipe 5 and the second communicating pipe 7. When the water level in the draft tube changes, the water levels in the first communicating pipe 5 and the second communicating pipe 7 will change accordingly and remain consistent with the water level in the draft tube. When the phase - modulation water level in the draft tube is within the measurement range of the present utility model, the water levels in the first communicating pipe 5 and the second communicating pipe 7 are the same as that in the draft tube, and the lower parts of the first communicating pipe 5 and the second communicating pipe 7 are filled with water and the upper parts are filled with air. When the phase - modulation water level in the draft tube is above the measurement range of the present utility model, the first communicating pipe 5 and the second communicating pipe 7 will be completely filled with water. On the contrary, when the phase - modulation water level in the draft tube is below the measurement range of the present utility model, the first communicating pipe 5 and the second communicating pipe 7 will be filled with air.

[0026] Further, in order to meet the design requirements of different preset warning water levels, multiple tuning fork switches 1 are designed. The multiple tuning fork switches 1 are arranged at intervals along the height direction of the first connecting pipe 5 and are detachably fixed on the pipe wall of the first connecting pipe 5, and the fork bodies of the tuning fork switches 1 extend into the first connecting pipe 5. At the same time, when prefabricating the first connecting pipe 5, according to the preset alarm water level and the number of liquid level switch quantity signals, corresponding positions on the pipe wall of the first connecting pipe 5 are selected to weld joints with internal threads. The function of these joints is to provide fixed points for installing the tuning fork switches 1. Each tuning fork switch 1 corresponds to a preset alarm water level. When the water level in the first connecting pipe 5 reaches any preset alarm water level, the tuning fork switch 1 corresponding to the preset alarm water level will be triggered to output a liquid level switch quantity signal. Such a design ensures that the phase modulation water level measuring device of the present utility model can accurately respond to the requirements of different preset alarm water levels.

[0027] The real-time liquid level measuring component 2 includes a guided wave radar liquid level gauge 201 for outputting a liquid level analog signal. The guided wave radar liquid level gauge 201 is detachably fixed at the top of the second connecting pipe 7, and the waveguide rod of the guided wave radar liquid level gauge 201 extends from the top of the second connecting pipe 7 into the second connecting pipe 7 and extends to the lower end. The waveguide rod can measure the real-time water level height in the second connecting pipe 7 and output a liquid level analog signal in real time. The design of using the guided wave radar liquid level gauge 2 further enhances the use reliability and measurement accuracy of the phase modulation water level measuring device.

[0028] When the tuning fork switch 1 monitors that the water level in the first connecting pipe 5 reaches the preset alarm water level and the guided wave radar liquid level gauge 201 measures the real-time water level in the second connecting pipe 7, they will respectively output a liquid level switch quantity signal and a liquid level analog signal and transmit them to the monitoring system. The monitoring system comprehensively evaluates the switch quantity signal and the analog signal to achieve a comprehensive analysis of the phase modulation water level information, thereby obtaining an accurate comprehensive water level condition, and then performing the valve opening and closing operations during the water pressing and exhaust process to meet the requirements of the phase modulation working condition and the working condition conversion for the phase modulation water level, so as to maintain the stable operation and safety performance of the power system. The present utility model utilizes the dual advantages of the tuning fork switch 1 and the guided wave radar liquid level gauge 2 to improve the response speed and anti-electromagnetic interference ability of the measurement signal, and realizes the accurate and reliable measurement of the phase modulation water level of the pumped storage unit.

[0029] Preferably, the first connecting pipe 5 and the second connecting pipe 7 are of the same size. At the same time, according to different range requirements, the prefabricated lengths of the first connecting pipe 5 and the second connecting pipe 7 can be adjusted to meet the requirements of phase modulation water level measurement and installation at the same time.

[0030] The upper ends of the first connecting pipe 5 and the second connecting pipe 7 are connected through an upper connecting pipe 6, and the lower ends of the first connecting pipe 5 and the second connecting pipe 7 are connected through a lower connecting pipe 11. Both the upper connecting pipe 6 and the lower connecting pipe 11 are horizontally arranged. This design fully follows the principle of communicating vessels, ensuring the accuracy and reliability of water level measurement. When performing the phase modulation water level measurement, since the pressure in the low water level area of the draft tube is higher than that in the high water level area, the water flow naturally enters the first connecting pipe 5 from the low water level connecting pipe 9 and enters the second connecting pipe 7 through the lower connecting pipe 11. According to the principle of communicating vessels, the water levels in the first connecting pipe 5 and the second connecting pipe 7 will be kept consistent with the water level in the draft tube in real time. As the water level rises, the excess air in the second connecting pipe 7 is released through the upper connecting pipe 6 to the upper end of the first connecting pipe 5 and is finally discharged through the high water level connecting pipe 8 and returns to the draft tube of the pumped storage unit; conversely, when the water level drops, the air enters through the low water level connecting pipe 8, and the water flow is discharged through the low water level connecting pipe 9, thereby maintaining the water level balance and accurate measurement of the entire phase modulation water level measuring device.

[0031] An upper maintenance valve 3 is installed in the middle of the high water level connecting pipe 8, and a lower maintenance valve 4 is installed in the middle of the low water level connecting pipe 9. The upper maintenance valve 3 and the lower maintenance valve 4 are preferably manual ball valves. When it is necessary to maintain the measuring device, the upper maintenance valve 3 and the lower maintenance valve 4 can be closed respectively to cut off the water flow, so as to conveniently carry out the maintenance work.

[0032] As described above, it is only the specific implementation manner of the present utility model. Any feature disclosed in this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features; all the features disclosed, or all the steps in any method or process, except for the mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A phase-adjusting water level measuring device for a pumped storage unit, characterized in that: The invention comprises a high water level connecting pipe (8), a low water level connecting pipe (9), a first connecting pipe (5), a second connecting pipe (7), a real-time liquid level measuring device (2) and a tuning fork switch (1) for outputting a liquid level switch quantity signal. The first connecting pipe (5) and the second connecting pipe (7) are vertically arranged in parallel. The upper end of the first connecting pipe (5) is respectively connected to the upper ends of the high water level connecting pipe (8) and the second connecting pipe (7). The lower end of the first connecting pipe (5) is respectively connected to the lower ends of the low water level connecting pipe (9) and the second connecting pipe (7). The tuning fork switch (1) is mounted on the first connecting pipe (5). The real-time liquid level measuring device (2) is mounted on the second connecting pipe (7). The first connecting pipe (5) is connected to the tailwater pipe of the pumped storage unit through the high water level connecting pipe (8) and the low water level connecting pipe (9) to form a first communicating vessel structure. The second communicating pipe (7) cooperates with the first connecting pipe (5) to form a second communicating vessel structure.

2. A pumped storage unit phase-adjusting water level measuring device according to claim 1, characterized in that: The tuning fork switches (1) are arranged in a plurality along the height direction of the first connecting tube (5) at intervals and are detachably fixed to the tube wall of the first connecting tube (5), and the fork bodies of the tuning fork switches (1) extend into the first connecting tube (5).

3. A pumped storage unit phase-adjusting water level measuring device according to claim 2, characterized in that: The real-time liquid level measuring component (2) comprises a guided wave radar liquid level meter (201) for outputting a liquid level analog signal, the guided wave radar liquid level meter (201) being detachably fixed to the top end of the second connecting tube (7), and a waveguide rod of the guided wave radar liquid level meter (201) extending from the top end of the second connecting tube (7) into the second connecting tube (7) and extending to the lower end.

4. A phase-adjusting water level measuring device for a pumped storage unit according to any one of claims 2 or 3, characterized in that: The first connecting tube (5) and the second connecting tube (7) are of the same size.

5. A pumped storage unit phase-adjusting water level measuring device according to claim 4, characterized in that: The upper end of the first connecting tube (5) is connected to the upper end of the second connecting tube (7) via an upper connecting tube (6), and the lower end of the first connecting tube (5) is connected to the lower end of the second connecting tube (7) via a lower connecting tube (11), and both the upper connecting tube (6) and the lower connecting tube (11) are arranged transversely.

6. A phase-adjusting water level measuring device for a pumped storage unit according to claim 5, characterized in that: An upper inspection valve (3) is installed in the middle of the high water level connecting pipe (8), and a lower inspection valve (4) is installed in the middle of the low water level connecting pipe (9).

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