A calibration device for a hydropower station level gauge

Abstract

This utility model belongs to the field of metrology technology, and in particular to a hydropower station level gauge calibration device, including a U-shaped barrel. A side-mounted level gauge and / or a standard level transmitter probe are installed on one side of the barrel. The side-mounted level gauge is connected to the bottom of one side of the U-shaped barrel. The probe of the standard level transmitter is installed inside the bottom of one side of the U-shaped barrel. The level gauge to be measured is installed at the top of the other side of the U-shaped barrel. This device changes the traditional single-barrel calibration to a double-barrel U-shaped structure with connected bottoms. Based on the principle of communicating vessels, the influence of the standard level transmitter probe on the water level can be reduced. The U-shaped barrel automatically balances the liquid levels on both sides through the principle of communicating vessels, and the change in liquid volume is evenly distributed on both sides. This allows the level gauge to be measured to be inserted inside the other side of the U-shaped barrel, thereby increasing measurement accuracy and reducing errors.

Description

Technical Field

[0001] This utility model belongs to the field of metrology technology, specifically relating to a calibration device for a hydropower station level gauge. Background Technology

[0002] In the field of industrial automation control, especially in liquid level control systems, liquid level gauges play a crucial role. They are responsible for displaying and alarming the liquid level, controlling the start of various pumps or motors, and thus achieving precise control of the liquid level. However, as the liquid level gauge is used for a long time and is affected by the working environment, its performance may change. For example, the liquid level gauge may display the liquid level inaccurately or the liquid level gauge switch may malfunction. Such faults may lead to liquid level control failure, which may cause the pump or motor to run dry or the liquid in the tank to overflow, or even cause a safety accident.

[0003] Existing calibration devices have significant shortcomings. Conventional level gauges use single-tank calibration, which is easily affected by the volume of the level gauge itself, resulting in excessive water level changes. Furthermore, they are not suitable for calibrating various types of level gauges in hydropower stations, nor can they accurately test the action value of the level gauge's switch output and the linearity of the level gauge's analog output. This makes it difficult to accurately determine whether the level gauge is in normal working condition in practical applications, and also makes it impossible to detect potential faults in a timely manner. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a hydropower station level gauge calibration device, which increases measurement accuracy and reduces the impact of excessive water level fluctuations caused by the volume of the level gauge itself, thus minimizing potential errors.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydropower station level gauge calibration device, comprising a U-shaped barrel, wherein a side-mounted level gauge and / or a standard level transmitter probe are installed on one side of the barrel body, wherein the side-mounted level gauge is connected to the bottom end of one side of the barrel body, the probe of the standard level transmitter is installed inside the bottom end of one side of the barrel body, and the level gauge to be measured is installed at the top end of the barrel body on the other side of the U-shaped barrel.

[0006] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, a water inlet is provided at the top of the barrel on the other side of the U-shaped barrel, and a drain outlet is provided at the bottom of the barrel on the other side of the U-shaped barrel.

[0007] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, the inlet and outlet are controlled by electric valves to control the flow and cut off of liquid.

[0008] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, an overflow port is provided at the top of the barrel on the other side of the U-shaped barrel, and the overflow port is not higher than the water inlet.

[0009] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, the side-mounted level gauge is connected to the bottom of one side of the U-shaped barrel via a mechanical valve.

[0010] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, an installation bucket for installing a standard level transmitter probe is fixedly connected to the inner side of the bottom end of one side of the U-shaped bucket.

[0011] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, the mounting bucket includes a top cover and a side shell fixed to the top cover. The top cover has an opening through which the power supply line passes laterally. The side shell is semi-cylindrical, and one end of the side shell is provided with an elastic clamping part. The top cover, side shell and clamping part are in a cylindrical structure as a whole.

[0012] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, the U-shaped bucket includes a measuring bottom bucket, several intermediate buckets and a top bucket. The two measuring bottom buckets are connected by a connecting part, and the measuring bottom bucket, intermediate buckets and top bucket are detachably connected by threads.

[0013] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, the drain outlet is located at the connecting part or the measuring bottom tank.

[0014] As a preferred embodiment of the hydropower station level gauge calibration device of this utility model, the level gauge to be tested is installed on the top of the barrel on the other side of the U-shaped barrel via an installation platform.

[0015] Compared with the prior art, the beneficial effects of this utility model are: it changes the traditional single-bucket calibration to a double-bucket U-shaped structure with a connected bottom. When a side-mounted level gauge and / or a standard level transmitter probe are installed on one side of the U-shaped bucket, based on the principle of communicating vessels, the influence of the standard level transmitter probe on the water level can be reduced. The U-shaped bucket automatically balances the liquid levels on both sides through the principle of communicating vessels, and the change in liquid volume is evenly distributed on both sides. Thus, when the level gauge to be measured is inserted into the inner side of the other side of the U-shaped bucket, the measurement accuracy can be increased and the error can be reduced.

[0016] In a single-tank calibration device, if the probes of the level gauge under test and the standard level transmitter are installed on the same side, the presence of the probes may directly interfere with the water level around the level gauge under test. The advantage of the U-shaped tank structure is that it can isolate the interference of the standard level transmitter probes to the level gauge under test. In the single-tank structure, even if the diameter is increased, the insertion of the probe will still cause local interference, such as water flow disturbances and local changes in static pressure. These interferences will directly affect the measurement accuracy of the level gauge under test. The U-shaped tank, by placing the probes and the level gauge under test on two separate sides, uses the principle of communicating vessels to balance the liquid level, effectively avoiding this direct interference. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a first-view schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a second-view schematic diagram of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the connection structure of the measuring bottom bucket in this utility model;

[0021] Figure 4 This is a schematic diagram of the connection structure of the installation platform in this utility model;

[0022] Figure 5 This is a schematic diagram of the overall structure of the mounting bucket in this utility model;

[0023] In the picture:

[0024] 1. U-shaped tank; 2. Side-mounted level gauge; 3. Standard level transmitter; 4. Level gauge to be measured; 5. Inlet; 6. Outlet; 7. Electric valve; 8. Overflow port; 9. Mechanical valve; 10. Mounting tank; 11. Measuring bottom tank; 12. Connecting part; 13. Intermediate tank; 14. Top tank; 15. Mounting platform;

[0025] 101. Top cover; 102. Side shell; 103. Clamping part;

[0026] 31. Probe. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1-5 As shown:

[0029] A hydropower station level gauge calibration device includes a U-shaped barrel 1. A side-mounted level gauge 2 and / or a probe 31 of a standard level transmitter 3 are installed on one side of the barrel body of the U-shaped barrel 1. The side-mounted level gauge 2 is connected to the bottom end of one side of the barrel body of the U-shaped barrel 1. The probe 31 of the standard level transmitter 3 is installed inside the bottom end of one side of the barrel body of the U-shaped barrel 1. The level gauge 4 to be measured is installed at the top end of the barrel body on the other side of the U-shaped barrel 1.

[0030] In this embodiment, in the field of industrial automation control, especially in liquid level control systems, the liquid level gauge plays a crucial role. It is responsible for liquid level display and alarm to control the start of various pumps or motors, thereby achieving precise control of the liquid level. However, as the liquid level gauge is used for a long time and the working environment affects it, its performance may change. For example, the liquid level gauge may display the liquid level inaccurately or the liquid level gauge may malfunction. Such faults may lead to liquid level control failure, which may cause the pump or motor to run dry or the liquid in the tank to overflow, or even cause a safety accident.

[0031] The existing calibration devices have obvious shortcomings. Conventional level gauges use single-tank calibration, which is easily affected by the volume of the level gauge itself, resulting in excessive water level changes. Furthermore, they are not suitable for calibrating various types of level gauges in hydropower stations, nor can they accurately test the action value of the switch output of the level gauge and the linearity of the analog output. This makes it difficult to accurately determine whether the level gauge is in normal working condition in practical applications, and also makes it impossible to detect potential faults in a timely manner.

[0032] The traditional single-bucket calibration method is changed to a U-shaped structure with two connected bottoms. When a side-mounted level gauge 2 and / or the probe 31 of a standard level transmitter 3 are installed on one side of the U-shaped bucket 1, the influence of the probe 31 of the standard level transmitter 3 on the water level can be reduced based on the principle of communicating vessels. The U-shaped bucket 1 automatically balances the liquid levels on both sides through the principle of communicating vessels, and the change in liquid volume is evenly distributed on both sides. Thus, when the level gauge 4 to be measured is inserted into the inner side of the other side of the U-shaped bucket 1, the measurement accuracy can be increased and the error can be reduced.

[0033] In a single-tank calibration device, if the probe 31 of the level gauge 4 to be measured and the standard level transmitter 3 are installed on the same side, the presence of the probe 31 may directly interfere with the water level around the level gauge 4. The advantage of the U-shaped tank 1 structure is that it can isolate the interference of the probe 31 of the standard level transmitter 3 to the level gauge 4 to be measured. In the single-tank structure, even if the diameter is increased, the insertion of the probe 31 will still cause local interference, such as water flow disturbance and local static pressure change. These interferences will directly affect the measurement accuracy of the level gauge 4 to be measured. The U-shaped tank 1, by placing the probe 31 and the level gauge 4 to be measured on two separate sides, uses the principle of communicating vessels to balance the liquid level, effectively avoiding this direct interference.

[0034] Water is filled into the U-shaped bucket 1. The water level can be detected by a side-mounted level gauge 2 or a standard level transmitter 3, or both can be used simultaneously. Simultaneous detection by both provides higher accuracy and avoids inaccurate subsequent calibration due to errors in the value detected by one detector. If two standard level transmitters 3 are installed at the same time, it will have a significant impact on the water volume. Therefore, using two different detection devices not only allows for data comparison but also minimizes the impact on the water volume. Then, the level gauge 4 to be tested is inserted into the U-shaped bucket 1 to compare the accuracy of the data.

[0035] In an optional embodiment, a water inlet 5 is provided at the top of the barrel on the other side of the U-shaped barrel 1, and a drain outlet 6 is provided at the bottom of the barrel on the other side of the U-shaped barrel 1.

[0036] In this embodiment, water can be injected into the U-shaped bucket 1 through the water inlet 5 and water can be discharged from the U-shaped bucket 1 through the drain outlet 6. By changing the water volume, the accuracy of the level gauge 4 under test can be dynamically detected, thereby achieving the purpose of calibration.

[0037] In an optional embodiment, the inlet 5 and outlet 6 are controlled by an electric valve 7 to control the flow and cut off of liquid.

[0038] In this embodiment, the electric valve 7, the side-mounted level gauge 2, and the standard level transmitter 3 can be connected to the controller. The controller controls the opening or closing of each electric valve 7, thereby making it easier to control the change in water volume in the U-shaped bucket 1. The controller can also display the readings of the side-mounted level gauge 2 and the standard level transmitter 3 for easy centralized observation.

[0039] In an optional embodiment, an overflow port 8 is provided at the top of the barrel on the other side of the U-shaped barrel 1, and the overflow port 8 is not higher than the water inlet 5.

[0040] In this embodiment, the overflow port 8 is provided to prevent water from overflowing due to operation or device failure. The overflow port 8 can be connected to a pipe to discharge the overflowing water into the target area.

[0041] In an optional embodiment, the side-mounted level gauge 2 is connected to the bottom of one side of the U-shaped barrel 1 via a mechanical valve 9.

[0042] In this embodiment, whether or not the side-mounted level gauge 2 is used can be controlled by the mechanical valve 9. When the mechanical valve 9 opens the passage, the side-mounted level gauge 2 can be used. Conversely, when the mechanical valve 9 closes the passage, the side-mounted level gauge 2 is not used.

[0043] In an optional embodiment, an installation bucket 10 for installing the probe 31 of the standard liquid level transmitter 3 is fixedly connected to the inner side of the bottom end of one side of the U-shaped bucket 1.

[0044] In this embodiment, the installation bucket 10 can fix the probe 31 more stably, preventing the probe 31 from shaking when water is added or drained.

[0045] In an optional embodiment, the mounting bucket 10 includes a top cover 101 and a side shell 102 fixed to the top cover 101. The top cover 101 has an opening through which a power supply line passes laterally. The side shell 102 is semi-cylindrical, and one end of the side shell 102 is provided with an elastic clamping part 103. The top cover 101, the side shell 102 and the clamping part 103 are in a cylindrical structure as a whole.

[0046] In this embodiment, the probe 31 can be inserted from the side of the mounting barrel 10, the opening at the top cover 101 allows the power supply cable to pass through, and the clamping part 103 can stably clamp the probe 31 inside it, such as Figure 5 As shown, since the clamping part 103 is located in the middle part of the side shell 102, the clamping part 103 can be more conducive to elastic deformation, making the installation and removal of the probe 31 smoother.

[0047] In an optional embodiment, the U-shaped bucket 1 includes a measuring bottom bucket 11, a plurality of intermediate buckets 13 and a top bucket 14, with two measuring bottom buckets 11 connected by a connecting part 12, and the measuring bottom buckets 11, intermediate buckets 13 and top bucket 14 being detachably connected by threads.

[0048] In this embodiment, the U-shaped bucket 1 is divided into three parts: the bottom is the measuring bottom bucket 11, the middle part is several intermediate buckets 13, and the top is the top bucket 14. The number of intermediate buckets 13 can be selected according to the length of the liquid level gauge 4 being measured, so as to achieve the change of the overall height. The detachable design is more conducive to installing the probe 31 in the installation bucket 10, avoiding the problem of installation difficulty caused by a fixed structure where the bucket body is too long and it is difficult for the hand to directly touch the installation bucket 10.

[0049] In an optional embodiment, the drain outlet 6 is located at the connecting portion 12 or the measuring bottom barrel 11.

[0050] In this embodiment, since the connecting part 12 can be set as a U-shaped structure, when the drain outlet 6 is set at the connecting part 12, the liquid can be drained better. If the connecting part 12 is a straight structure, the drain outlet 6 is set at the measuring bottom bucket 11, and the liquid flow direction is consistent during drainage, which can reduce the adverse effects caused by liquid disturbance.

[0051] In an optional embodiment, the level gauge 4 is mounted on the top of the U-shaped tank 1 on the other side of the tank via the mounting platform 15, and the measuring bottom tank 11 and several intermediate tanks 13 are longitudinally set with scale lines.

[0052] In this embodiment, the scale line can be used in conjunction with the side-mounted level gauge 2, the standard level transmitter 3, and the level gauge under test 4 for reading. The level gauge under test 4 is installed on the top of the barrel on the other side of the U-shaped barrel 1 via the mounting platform 15, which can better install and fix the level gauge under test 4, and still has a good fixing effect when adjusting the length of the barrel according to the length of the level gauge under test 4.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for calibrating a water level gauge of a hydroelectric power station, characterized in that: Includes a U-shaped bucket (1), on one side of the bucket body of the U-shaped bucket (1) a side-mounted level gauge (2) and / or the probe (31) of a standard level transmitter (3) are installed, wherein the side-mounted level gauge (2) is connected to the bottom end of one side of the bucket body of the U-shaped bucket (1), the probe (31) of the standard level transmitter (3) is installed on the inside of the bottom end of one side of the bucket body of the U-shaped bucket (1), and the level gauge (4) to be measured is installed at the top end of the bucket body on the other side of the U-shaped bucket (1).

2. The device for calibrating a water level gauge of a hydroelectric power station according to claim 1, characterized in that: A water inlet (5) is provided at the top of the barrel on the other side of the U-shaped barrel (1), and a drain outlet (6) is provided at the bottom of the barrel on the other side of the U-shaped barrel (1).

3. The device for calibrating a water level gauge of a hydroelectric power station according to claim 2, characterized in that: The inlet (5) and outlet (6) control the flow and cut-off of liquid through an electric valve (7).

4. The hydropower plant liquid level gauge verification device according to claim 2, characterized in that: An overflow port (8) is provided at the top of the barrel on the other side of the U-shaped barrel (1), and the overflow port (8) is not higher than the inlet (5).

5. The hydropower plant liquid level gauge verification device according to claim 1, characterized in that: The side-mounted level gauge (2) is connected to the bottom of one side of the U-shaped barrel (1) via a mechanical valve (9).

6. The hydropower station level gauge calibration device according to claim 1, characterized in that: The U-shaped bucket (1) has a mounting bucket (10) for installing the probe (31) of the standard liquid level transmitter (3) fixedly connected to the inner side of the bottom of one side of the bucket body.

7. The hydropower station level gauge calibration device according to claim 6, characterized in that: The mounting bucket (10) includes a top cover (101) and a side shell (102) fixed to the top cover (101). The top cover (101) has an opening through which the power supply line passes horizontally. The side shell (102) is semi-cylindrical and has an elastic clamping part (103) at one end. The top cover (101), side shell (102) and clamping part (103) are cylindrical in structure.

8. The hydropower station level gauge calibration device according to any one of claims 2-4, characterized in that: The U-shaped bucket (1) includes a measuring bottom bucket (11), several intermediate buckets (13) and a top bucket (14). The two measuring bottom buckets (11) are connected by a connecting part (12), and the measuring bottom bucket (11), intermediate buckets (13) and top bucket (14) are detachably connected by threads.

9. The hydropower station level gauge calibration device according to claim 8, characterized in that: The drain outlet (6) is located at the connecting part (12) or the measuring bottom bucket (11).

10. The hydropower station level gauge calibration device according to claim 1, characterized in that: The level gauge (4) is installed on the top of the barrel on the other side of the U-shaped barrel (1) via the mounting platform (15).

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