A stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge

Abstract

The present invention provides a stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge, relates to the technical field of water level detection equipment, and comprises: a base and an outer tube, wherein the base is used to be placed on the bottom of the water, the bottom end of the outer tube is fixedly arranged on the base, the top end of the outer tube is closed, a plurality of air outlets are provided on the tube wall of the outer tube at a position 1.5 cm to 3 cm downward from the top end, the plurality of air outlets are all located on the same plane, a cavity in the outer tube between the air outlets and the top end of the outer tube forms an air chamber, the end of an air blowing pipe of the bubble-type water level gauge is fixed in the air chamber, the cross-sectional area of ​​the air chamber is larger than the cross-sectional area of ​​the air blowing pipe of the bubble-type water level gauge, and at least one water inlet is provided on the outer tube between the air outlet of the outer tube and the bottom end of the outer tube; the stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge provided by the present invention can improve the accuracy and stability of detection results.

Description

Technical Field

[0001] The invention relates to the technical field of water level detection equipment, and in particular to a stabilizing device for facilitating underwater installation and measurement of a bubble type water level gauge. Background Art

[0002] In the application technology of the automatic hydrological measurement and reporting system, the accuracy of the data is closely related to the accuracy of the water level collected by the water level meter. The equipment for automatic monitoring of water level includes electronic water gauge, float water level gauge, ultrasonic water level gauge, radar water level gauge, pressure water level gauge and bubble water level gauge, etc., which should be selected according to the actual situation on site.

[0003] Compared with other water level gauges, the installation technology of bubble water level gauge is not only simple to install and requires less construction, but also can measure the lowest water level that other water level gauges cannot (or are difficult to reach), and has more application potential than other types of water level gauges. At present, when water level gauges are installed and laid for water level monitoring in many small and medium-sized rivers and reservoirs, due to the influence of environment and terrain, the site does not have the corresponding construction conditions required for radar, float and other types of water level gauges, so only bubble water level gauges are used.

[0004] Working principle of bubble water level gauge: external air is filtered and purified through the air filter and then enters the air pump. After being compressed by the air pump, air pressure is generated and quickly flows to the air chamber through the one-way valve. The gas is divided into two paths and diffuses to the pressure sensor in the pressure control unit and the air blowing pipe leading to the underwater. When the air pump stops working, the one-way valve closes, and the underwater air blowing pipe mouth is sealed by gas, thus forming a closed gas pressure transmission path connecting the pressure sensor and the underwater air chamber (isobaric transmission-the air column pressure can be negligible). Since the pressure at various places in the closed gas container is equal, the pressure at the air pipe port (air chamber) is equal to the pressure at the sensor of the pressure control unit. By subtracting the atmospheric pressure from this pressure, the static pressure of the water level at the end of the air blowing pipe of the bubble water level gauge can be obtained. The measured water level can be obtained by conversion and correction.

[0005] However, the measurement of the bubble water level gauge is greatly affected by factors such as the sand content of the measured water body, the degree of siltation, and the water flow rate. The turbulent water flow will produce a large change in water pressure, and the diameter of the air pipe orifice is usually very small. The change in water pressure will produce a large pressure fluctuation in the confined space inside the air pipe, resulting in inaccurate detection results. In addition, the existing bubble water level gauge directly places the probe on the bottom of the water when in use, which may cause the air pipe orifice of the bubble water level gauge to be buried when river sand accumulates, or the turbulent water flow may cause the air pipe to be swept away by the water flow and float up and down in the water, resulting in abnormal detection results.

[0006] In order to ensure that the air pipe of the bubble water level gauge can work underwater for a long time without being affected by turbulence, turbulence, and sediment, and at the same time ensure that the pressure changes in the air pipe are smooth and orderly when the water level fluctuates greatly, it is urgent to develop a set of devices that can fix the air pipe underwater and a stabilizing device for water level detection during the installation and use of the bubble water level gauge. Summary of the invention

[0007] The purpose of the present invention is to provide a stabilizing device that facilitates underwater installation and measurement of a bubble-type water level gauge, so as to solve the problems existing in the above-mentioned prior art and improve the accuracy and stability of the detection results.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a stabilizing device for facilitating underwater installation and measurement of a bubble water level gauge, comprising: a base and an outer tube, wherein the base is used to be placed on the bottom of the water, the bottom end of the outer tube is fixedly arranged on the base, the top end of the outer tube is closed, a plurality of air outlets are provided on the tube wall of the outer tube at a position 1.5 cm to 3 cm downward from the top end, the plurality of air outlets are all located on the same plane, an air chamber is formed in the cavity in the outer tube between the air outlet and the top end of the outer tube, the end of the air blowing pipe of the bubble water level gauge is fixed in the air chamber, the cross-sectional area of ​​the air chamber is larger than the cross-sectional area of ​​the air blowing pipe of the bubble water level gauge, and at least one water inlet is provided on the outer tube between the air outlet of the outer tube and the bottom end of the outer tube.

[0010] Preferably, it also includes an inner support and an inner tube, wherein the inner support is arranged in the outer tube, and the inner support is a sliding guide rail with strong resistance. The inner tube can be slidably arranged on the inner support, and the inner tube will slide on the guide rail only when the force applied to the inner tube exceeds the resistance value between the inner support and the sliding guide rail. A gland for fixing the air blowing pipe is installed on the inner tube, and the air blowing pipe is passed through the inner tube.

[0011] Preferably, the base is a cross-shaped plane structure laid flat on the bottom of the water, and the base includes a plurality of stabilizing tubes and a five-way connector. The center of the base is a five-way connector, and the five adjacent directions of the five-way connector are perpendicular to each other. The stabilizing tubes are installed in four horizontal directions on the five-way connector and extend outward to form a cross-shaped plane structure, and the air pipe enters into the inner tube through one of the stabilizing tubes.

[0012] Preferably, the outer tube is arranged perpendicular to each of the stabilizing tubes, and the height of the outer tube does not exceed 30 cm.

[0013] Preferably, the outer tube, the inner tube and the stabilizing tube are all made of stainless steel.

[0014] Preferably, a plurality of water inlet holes are provided on the outer tube, the plurality of water inlet holes are all provided on the same side of the outer tube and the plurality of water inlet holes are sequentially arranged along the axial direction of the outer tube, and the water inlet holes are arranged close to the base.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The air blowing probe of the bubble water level gauge in the stabilizing device provided by the present invention for facilitating underwater installation and measurement of the bubble water level gauge is not directly arranged on the riverbed, and therefore will not be buried by silt; in addition, the space between the top end of the outer tube and the air outlet serves as an air chamber, and the cross-sectional area of ​​the air chamber is larger than the cross-sectional area of ​​the air probe and the air pipe connected to the air probe; when the water pressure changes due to water flow or other reasons, the larger the cross-sectional area of ​​the air chamber, the smaller the oscillation degree of the water column in the outer tube; therefore, increasing the air chamber can reduce the influence of water pressure changes on the length of the air column and the height of the water column in the outer tube, thereby facilitating the bubble water level gauge to perform stable detection of the water pressure and improving the accuracy and stability of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A front view of a stabilizing device provided by the present invention for facilitating underwater installation and measurement of a bubble-type water level gauge;

[0019] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0020] Figure 3 for Figure 1 Schematic diagram of the assembly of the inner tube, the air blowing tube and the gland;

[0021] Figure 4 for Figure 1 A top view of a stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge;

[0022] In the figure: 1-inner tube, 2-air chamber, 3-air blowing pipe, 4-air outlet, 5-water inlet, 6-outer tube, 7-guide rail, 8-five-way pipe connector, 9-base, 10-stabilizing tube, 11-gland connector. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The purpose of the present invention is to provide a stabilizing device which is convenient for underwater installation and measurement of a bubble-type water level gauge, so as to solve the problems existing in the prior art and improve the accuracy and stability of the detection results.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The present invention provides a stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge, such as Figures 1 to 4 As shown, it includes: a base 9 and an outer tube 6, the base 9 is used to be placed on the bottom of the water, the bottom end of the outer tube 6 is fixedly arranged on the base 9, the top end of the outer tube 6 is closed, and a plurality of air outlet holes 4 are provided on the tube wall of the outer tube 6 at 1.5cm to 3cm downward from the top end, preferably at 3cm, and the plurality of air outlet holes 4 are all located on the same plane, and the cavity in the outer tube 6 between the air outlet holes 4 and the top end of the outer tube 6 forms an air chamber 2, and the end of the air blowing pipe 3 of the bubble water level gauge is fixed in the air chamber 2, and the cross-sectional area of ​​the air chamber 2 is larger than the cross-sectional area of ​​the air blowing pipe 3 of the bubble water level gauge, and at least one water inlet hole 5 is provided on the outer tube 6 between the air outlet hole 4 of the outer tube 6 and the bottom end of the outer tube 6, and after the stabilizing device for facilitating underwater installation and measurement of the bubble water level gauge is arranged on the bottom of the water, the distance between the water inlet hole 5 and the riverbed is between 10cm and 15cm, preferably 15cm, and the shaking phenomenon caused by silt accumulation and water flow scouring can be effectively avoided in places close to the riverbed or the installation surface.

[0027] The blowing probe of the bubble water level gauge in the stabilizing device provided by the present invention for facilitating underwater installation and measurement of the bubble water level gauge is not directly arranged on the riverbed, and therefore will not be buried by silt. In addition, the space between the top of the outer tube 6 and the air outlet 4 serves as an air chamber 2, and the cross-sectional area of ​​the air chamber 2 is larger than the cross-sectional area of ​​the blowing probe and the blowing pipe 3 connected to the blowing probe. When the water pressure changes due to water flow or other reasons, the larger the cross-sectional area of ​​the air chamber 2, the smaller the oscillation degree of the water column in the outer tube 6. Therefore, increasing the air chamber 2 can reduce the influence of the water pressure on the length of the air column and the height of the water column in the outer tube 6, which is convenient for the bubble water level gauge to perform stable detection of the water pressure and improve the accuracy and stability of the detection result.

[0028] Furthermore, a stabilizing device that facilitates underwater installation and measurement of the bubble-type water level gauge also includes an inner support and an inner tube 1. The inner support is arranged in the outer tube 6. The inner support is a sliding guide rail 7 with strong resistance. The inner tube 1 can be slidably arranged on the inner support, and the inner tube 1 will slide on the guide rail 7 only when the force applied to the inner tube 1 exceeds the resistance value between the inner support and the sliding guide rail 7. A gland 11 for fixing the air pipe 3 is installed on the inner tube 1. The air pipe 3 is passed through the inner tube 1. When not subjected to external force, the inner tube 1 is difficult to move on the guide rail 7. When the height of the end of the air pipe 3 needs to be changed, the staff adjusts the height of the end of the air pipe 3 by moving the position of the inner tube 1, so as to adjust the height of the end of the air pipe 3 so that the end of the air pipe 3 is always in the air chamber 2.

[0029] Furthermore, the base 9 includes a plurality of stabilizing tubes 10, each of which is 1.5 m long. One end of each of the stabilizing tubes 10 is fixedly connected to the bottom end of the outer tube 6, and the other end extends in a direction away from the outer tube 6. At least one stabilizing tube 10 is connected to the inner tube 1. The air blowing probe and the air blowing tube 3 enter the inner tube 1 through the stabilizing tube 10. The outer tube 6 is arranged perpendicular to each stabilizing tube 10. The outer tube 6, the inner tube 1 and the stabilizing tube 10 are all made of stainless steel. It is preferred that four stabilizing tubes 10 are arranged to improve the stability of the device. The fixed pipe 10 is a middle-through pipe, and the air blowing pipe 3 and the air blowing probe enter the inner pipe 1 through the stabilizing pipe 10 and are fixed by the gland 11. The angle between any two adjacent stabilizing pipes 10 is 90°. The four stabilizing pipes 10 are fixedly connected to the bottom end of the outer pipe 6 through a five-way pipe joint 8. The five-way pipe joint 8 is made of stainless steel. The inner diameter of the outer pipe 6 is 25 mm, and the outer diameter of the outer pipe 6 is 35 mm. The outer pipe 6 is a stainless steel pipe. The outer pipe 6 is slender and has a "stealth" effect on the water flow to reduce obstacles to the flow of water.

[0030] Furthermore, the outer tube 6 is arranged perpendicular to each stabilizing tube 10, and the height of the outer tube 6 does not exceed 30 centimeters.

[0031] Furthermore, the outer tube 6, the inner tube 1 and the stabilizing tube 10 are all made of stainless steel.

[0032] Furthermore, a plurality of water inlet holes 5 are provided on the outer tube 6, and the plurality of water inlet holes 5 are all provided on the same side of the outer tube 6 and are arranged in sequence along the axial direction of the outer tube 6, and the water inlet holes 5 are arranged close to the base 9. The above arrangement can make the water in the outer tube 6 more stable, and prevent the occurrence of inaccurate measurement results due to excessive fluctuations in the water surface in the outer tube 6 in waters with turbulent water flow.

[0033] Furthermore, the top end of the outer tube 6 is closed by a sealing cap 1 , and an air chamber is formed between the sealing cap 1 and the air outlet 4 .

[0034] Here’s how to use it:

[0035] Install the blowing probe in the inner tube 1 through the stabilizing tube 10, slide the inner tube 1 on the guide rail 7 so that the blowing probe is located at the height of the air chamber 2, and then fix the position of the inner tube 1, coaxially sleeve the outer tube 6 outside the inner tube 1 and the blowing probe is located in the air chamber 2 of the outer tube 6, slowly sink the whole device to the bottom of the water and make the base 9 contact with the bottom of the water, blow air into the air chamber 2 through the blowing probe and discharge the water in the air chamber 2 until gas overflows from the air outlet 4. At this time, the air outlet 4 is below the water surface and above the air surface, and then stop blowing air into the air chamber 2 or adjust the blowing speed until the air outlet 4 has a balanced state where small bubbles slowly overflow, then it can be considered that the gas pressure in the air chamber 2 is approximately equal to the water pressure, and the air bag on the shore is connected to the air chamber 2 through the blowing pipe 3. Therefore, the air pressure in the air bag on the shore is measured and converted into the liquid level.

[0036] Principle analysis:

[0037] The traditional method of using the bubble water level gauge is to directly place one end of the air tube 3 with the air probe in the water. The cross-section of the air tube 3 is very small. The smallest diameter of the air tube 3 is only 2 mm, and the largest is only 8 mm. This results in a very small gas-liquid contact area at the mouth of the air tube 3. Changes in water pressure will cause water to enter the air tube 3 from the mouth of the air tube 3 and compress the air column in the air tube 3. The drastic change in the air pressure inside the air tube 3 will result in a very large pressure fluctuation in the measurement, and the value obtained during the measurement process will be very inaccurate.

[0038] Expressed in data calculation formula:

[0039] The water pressure at the 3rd port of the air blowing pipe is V

[0040] Inner radius r of air blowing pipe 3

[0041] The equivalent radius R of air chamber 2

[0042] The change in external pressure is ΔV

[0043] Case 1: Without adding air chamber 2, the blowing tube 3 is directly placed in the water:

[0044] ΔV=π·r 2 ·Δh1………………Δh1 is the change in length of the air column generated in the air blowing pipe 3 when the pressure changes;

[0045] ΔV=π·R 2 ·Δh2………………Δh2 is the change in length of the air column produced by the pressure change in air chamber 2;

[0046] Assume that r is the radius of the air blowing tube 3, which is equal to 1 mm, R is the inner radius of the air chamber 2, which is equal to 12.5 mm, and ΔV is the change in gas volume caused by the air pressure disturbance. Δh1 is the change in length of the water column (corresponding to the air column) in the air blowing tube, and Δh2 is the change in length of the water column (corresponding to the air column) in the air chamber 2. From the above calculation, it can be deduced that Δh1>>Δh2. This explains the necessity of adding air chamber 2, which can reduce the change in the water column caused by the air pressure disturbance. The smaller the change in the water column, the more stable the measurement process and the more accurate the measurement.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge, characterized in that: include: A base and an outer tube, wherein the base is used to be placed on the bottom of the water, the bottom end of the outer tube is fixedly arranged on the base, the top end of the outer tube is closed, and a plurality of air outlets are provided on the tube wall of the outer tube 1.5 cm to 3 cm downward from the top end, and the plurality of air outlets are all located on the same plane, and the cavity in the outer tube between the air outlet and the top end of the outer tube forms an air chamber, and the end of the air blowing pipe of the bubble water level gauge is fixed in the air chamber, and the cross-sectional area of ​​the air chamber is larger than the cross-sectional area of ​​the air blowing pipe of the bubble water level gauge, and a plurality of water inlet holes are provided on the outer tube between the air outlet and the bottom end of the outer tube, and the plurality of water inlet holes are all opened on the same side of the outer tube and the plurality of water inlet holes are arranged in sequence along the axial direction of the outer tube, and the water inlet holes are arranged close to the base; it also includes an inner support and an inner tube, and the The inner support is arranged in the outer tube, and the inner support is a sliding guide rail with strong resistance. The inner tube can be slidably arranged on the inner support, and the inner tube will slide on the guide rail only when the force applied to the inner tube exceeds the resistance value between the inner support and the sliding guide rail. A gland for fixing the air blowing pipe is installed on the inner tube, and the air blowing pipe is passed through the inner tube; the base is a cross-shaped plane structure laid flat on the bottom of the water, and the base includes a plurality of stabilizing tubes and a five-way connector. The center of the base is a five-way connector, and the adjacent directions of the five directions of the five-way connector are perpendicular to each other. The stabilizing tube is installed in four horizontal directions on the five-way connector and extends outward to form a cross-shaped plane structure, and the air blowing pipe enters into the inner tube through one of the stabilizing tubes.

2. The stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge according to claim 1, characterized in that: The outer tube is arranged perpendicular to each of the stabilizing tubes, and the height of the outer tube does not exceed 30 centimeters.

3. The stabilizing device for facilitating underwater installation and measurement of a bubble-type water level gauge according to claim 1, characterized in that: The outer tube, the inner tube and the stabilizing tube are all made of stainless steel.

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