Weighing type constant water level measurement and control device

Abstract

The utility model discloses a weighing type constant water level measuring and controlling device which comprises a constant water level water tank, the constant water level water tank is connected with a lysimeter or a measuring pit through a water level communicating pipe, an overflow water pipe is arranged on the lower side wall of the constant water level water tank in a penetrating mode and connected with a weighing water bucket, and a water feeding pipe is connected between the weighing water bucket and the constant water level water tank. The constant-water-level water tank is arranged, the continuous overflow constant-water-level principle is adopted, and the water level is kept stable continuously. In order to guarantee continuous overflow, the water supply amount is larger than the actual evaporation water consumption amount, and redundant water flows back to the weighing water supplementing barrel through the overflow pipe. Meanwhile, the soil infiltration flow also enters the weighing and water supplementing bucket through the overflow pipe. And the weighing water supplementing barrel continuously weighs at regular time through the weighing platform, so that the real-time evaporation capacity or real-time infiltration capacity of the evaporation and infiltration barrel can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of constant water level measurement and control devices, in particular to a weighing type constant water level measurement and control device. Background Technique

[0002] The constant water level measurement and control device is used in a pit / ground permeameter system to provide a stable and variable groundwater level for measuring soil columns, and simultaneously measure the groundwater evaporation and soil leakage.

[0003] Conventionally, the leakage / groundwater evaporation is measured by an automatic groundwater level monitoring device based on the principle of Mariotte bottle.

[0004] The Mariotte bottle is a device for stabilizing the liquid level height, including an inverted bottle body 1, a drain pipe 2 is connected to the bottom end of the bottle body 1, and an air inlet pipe 3 is also connected to the bottle body 1, and the air inlet pipe 3 is connected to a telescopic pipe 4.

[0005] When the water level in the external water tank is controlled to drop below the position of the air inlet 3, the air inlet pipe 3 is exposed to the air, and air enters the bottle body 1 under the action of atmospheric pressure. The water surface pressure in the bottle is the same as the atmospheric pressure. Under the action of its own gravity, the water in the bottle flows into the external water tank through the drain pipe 2, causing the water level in the water tank to rise. When the water level in the water tank rises above the air inlet pipe 3, water will enter the air inlet pipe, and the atmosphere can no longer enter the water supply bottle body. When the air in the upper part of the bottle body forms a vacuum and the vacuum pressure balances with the water column pressure in the bottle, the water in the bottle stops flowing out, and the water level in the external water tank no longer rises.

[0006] In practical applications, the lower end of the vent pipe and the upper end of the overflow pipe of the device based on the Mariotte bottle principle should be as close as possible to a horizontal plane, but they cannot be exactly on the same horizontal plane, otherwise it will cause water injection and drainage at the same time and cannot work properly. To ensure normal operation, the upper end of the overflow pipe must be higher than the lower end of the vent pipe, which results in an inevitable observation blind area in the conversion of leakage and groundwater evaporation measurement, and the leakage and groundwater evaporation are measured by 2 sensors respectively, resulting in systematic errors, as Figure 2 shown;

[0007] The Mariotte bottle principle determines that:

[0008] (1) The vent pipe orifice and the overflow pipe orifice can only be as close as possible to the water level balance surface, but the two orifices will not be exactly on the same plane (the overflow pipe orifice will be slightly higher than the water level balance surface), otherwise the surface tension of water will cause continuous overflow. In the actual assembly of the instrument and the installation of the equipment, there is a large deviation in the height difference, and the height difference between the two orifices will result in an inevitable observation blind area in the conversion of leakage and groundwater evaporation, and this blind area is about 1 - 10 mm.

[0009] (2) The leakage and groundwater evaporation need to and can only be measured by 2 sensors respectively, resulting in systematic errors.

[0010] For this reason, a weighing type constant water level measurement and control device is proposed. Content of the Utility Model

[0011] The purpose of the present utility model is to provide a weighing type constant water level measurement and control device to solve the problems raised in the above-mentioned background technology.

[0012] To solve the above technical problems, the present utility model provides the following technical solution: A weighing type constant water level measurement and control device includes a constant water level water tank. The constant water level water tank is connected to a lysimeter or a soil pit through a water level connecting pipe. An overflow water pipe is penetrated through the lower side wall of the constant water level water tank. The overflow water pipe is connected to a weighing water bucket. An upper water pipe is connected between the weighing water bucket and the constant water level water tank. And a water pump is provided on the upper water pipe. A weighing platform is provided at the bottom of the weighing water bucket.

[0013] According to the above technical solution, the weighing water bucket is located at the lower end of the constant water level water tank.

[0014] According to the above technical solution, it further includes a base. The weighing platform is arranged on the upper surface of the base. A leveling mechanism is provided on the base.

[0015] According to the above technical solution, a guide rail is fixedly connected to the upper surface of the base. The constant water level water tank is movably connected with the guide rail.

[0016] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: By setting a constant water level water tank in the present utility model, based on the principle of continuous overflow and constant water level, the water level is kept continuously stable. To ensure continuous overflow, the water supply is greater than the actual evaporation water consumption. The excess water flows back to the weighing water replenishing bucket through the overflow pipe. At the same time, the soil infiltration flow also enters the weighing water replenishing bucket through the overflow pipe. The weighing water replenishing bucket is continuously weighed regularly through the weighing platform, and thus the real-time evaporation amount or real-time infiltration amount of the lysimeter can be obtained. Moreover, there is no measurement blind area in the conversion between evaporation and infiltration. By changing the height position of the constant water level water tank, the groundwater depth of the lysimeter or the soil pit can be accurately set. The observation blind area in the conversion between seepage and phreatic evaporation is eliminated; it is realized that the seepage amount and the phreatic evaporation amount are measured by the same sensor, eliminating the systematic error; the phreatic depth can be adjusted arbitrarily to obtain the phreatic evaporation amount with different groundwater depths changing with seasons. Description of the Drawings

[0017] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0018] Figure 1 It is a schematic diagram of the working principle of the Mariotte bottle of the present utility model;

[0019] Figure 2 is a schematic structural diagram of an existing constant water level measurement and control device;

[0020] Figure 3 is a front view structural schematic diagram of the present utility model;

[0021] In the figure: 1 - bottle body, 2 - drain pipe, 3 - air inlet pipe, 4 - telescopic pipe, 5 - base, 6 - water supply pipe, 7 - overflow water pipe, 8 - water level connecting pipe, 9 - guide rail, 10 - constant water level water tank, 11 - water pump, 12 - weighing bucket, 13 - weighing platform. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figures 1 - 3 , the present utility model provides a technical solution: a weighing type constant water level measurement and control device, including a constant water level water tank 10, the constant water level water tank 10 is connected to a lysimeter or a measuring pit through a water level connecting pipe 8. Under the action of the connecting pipe 8, the water levels of the constant water level water tank 10 and the lysimeter or the measuring pit are the same. An overflow water pipe 7 is penetrated through the lower side wall of the constant water level water tank 10, the overflow water pipe 7 is connected to a weighing bucket 12, a water supply pipe 6 is connected between the weighing bucket 12 and the constant water level water tank 10, and a water pump 11 is provided on the water supply pipe 6. The water pump 11 continuously pumps the water in the weighing bucket 12 into the constant water level water tank 10, and the water entering the constant water level water tank 10 flows back to the weighing bucket 12 through the overflow water pipe 7. A weighing platform 13 is provided at the bottom of the weighing bucket 12, and the real-time evaporation or infiltration amount of the groundwater can be obtained by real-time weighing;

[0024] Specifically, the weighing bucket 12 is located at the lower end of the constant water level water tank 10, which is convenient for the layout of pipelines, and the water can flow into the weighing bucket 12 through the overflow water pipe 7 under the action of gravity;

[0025] Specifically, it further includes a base 5, the weighing platform 13 is arranged on the upper surface of the base 5, and a leveling mechanism is provided on the base 5. The leveling mechanism can be an existing device and is used to ensure that the device is in a horizontal state during operation;

[0026] Specifically, a guide rail 9 is fixedly connected to the upper surface of the base 5, and the constant water level water tank 10 is movably connected to the guide rail 9. The guide rail 9 is vertically arranged, and the constant water level water tank 10 can slide on the guide rail 9 to adjust the height of the constant water level water tank 10 to adapt to different scenarios. A positioning bolt can be provided on the constant water level water tank 10 to fix the constant water level water tank 10 after adjusting its height;

[0027] When the utility model is in use, the constant water level water tank 10 is connected to the lysimeter or the soil pit through a water level connecting pipe 8. The water in the weighing water bucket 12 is continuously pumped into the constant water level water tank 10 by a water pump 11, and the water in the constant water level water tank 10 flows back to the weighing water bucket 12 through an overflow water pipe 7. The weighing platform 13 is used to weigh the weighing water bucket 12 in real time, and the real-time evaporation or infiltration amount of the phreatic water can be obtained.

[0028] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A weighing type constant water level measurement and control device, comprising a constant water level water tank (10), characterized in that: The constant water level water tank (10) is connected to the lysimeter or the soil pit through a water level connecting pipe (8). An overflow water pipe (7) is arranged through the lower side wall of the constant water level water tank (10). The overflow water pipe (7) is connected to a weighing water bucket (12). An upper water pipe (6) is connected between the weighing water bucket (12) and the constant water level water tank (10). A water pump (11) is arranged on the upper water pipe (6). A weighing platform (13) is arranged at the bottom of the weighing water bucket (12).

2. The weighing type constant water level measurement and control device according to claim 1, characterized in that: The weighing water bucket (12) is located at the lower end of the constant water level water tank (10).

3. The weighing type constant water level measurement and control device according to claim 2, characterized in that: It further includes a base (5). The weighing platform (13) is arranged on the upper surface of the base (5). A leveling mechanism is arranged on the base (5).

4. A weighing type constant water level measurement and control device according to claim 3, characterized in that: A guide rail (9) is fixedly connected to the upper surface of the base (5). The constant water level water tank (10) is movably connected with the guide rail (9).

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