Device for measuring dissolved oxygen content of solution

Abstract

The utility model discloses a device for measuring dissolved oxygen content of a solution, which comprises a sealed container, a first gas circuit, a second gas circuit, a sampling container, a sampling measuring unit, a third gas circuit and a fourth gas circuit, a solution storage cavity is arranged in the sealed container, the solution storage cavity is suitable for containing the solution to be measured, and the third gas circuit is arranged in the sealed container. A solution inlet and a solution outlet which are communicated with the solution storage cavity are formed in the sealed container, and switch valves are arranged on the solution inlet and the solution outlet; the first gas path penetrates through the sealed container and is communicated with the solution storage cavity, and the first gas path is suitable for introducing gas into the solution storage cavity of the sealed container; a first control valve is arranged on the first gas path, and the first control valve is suitable for controlling gas flow of the first gas path; and the second gas path penetrates through the sealed container and is communicated with the solution storage cavity. The dissolved oxygen content of the solution can be conveniently measured, and the operation is simple.

Description

Technical Field

[0001] The utility model relates to a device for measuring the dissolved oxygen content of a solution, belonging to the technical field of material corrosion test. Background Art

[0002] Dissolved oxygen (DO), the amount of oxygen dissolved in a liquid, is currently of vital importance in many industrial and scientific fields. Changes in DO directly impact the corrosion rate and behavior of materials. Corrosion is often accompanied by redox reactions, and oxygen, as an oxidant in the corrosive medium, is often a key factor influencing the corrosion rate.

[0003] After searching the prior art, it was found that Chinese patent publication number CN217766298U discloses a system for monitoring and controlling oxygen content. This patent uses a water pump to drain the solution from the water tank. During use, it was found that the water pump is susceptible to corrosion damage during long-term contact with corrosive solutions, making it inconvenient to use. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a device for measuring the dissolved oxygen content of a solution. The device can measure the dissolved oxygen content of the solution and is easy to operate.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a device for measuring the dissolved oxygen content of a solution, comprising:

[0006] A sealed container, wherein a solution storage cavity is provided in the sealed container, the solution storage cavity is suitable for accommodating a solution to be tested, the sealed container is provided with a solution inlet and a solution outlet connected to the solution storage cavity, and the solution inlet and the solution outlet are both provided with an on-off valve;

[0007] a first gas path, the first gas path passing through the sealed container and communicating with the solution storage chamber, the first gas path being adapted to introduce gas into the solution storage chamber of the sealed container;

[0008] A first control valve is provided on the first gas path, and the first control valve is suitable for controlling the gas flow in the first gas path;

[0009] a second gas path, the second gas path passing through the sealed container and communicating with the solution storage chamber, the second gas path being adapted to discharge gas from the solution storage chamber of the sealed container;

[0010] A second control valve is provided on the second gas path, and the second control valve is suitable for controlling the gas flow in the second gas path;

[0011] A sampling container, wherein a sampling cavity is provided in the sampling container, a communication pipe is provided between the sampling container and the sealed container, the communication pipe connects the solution storage chamber and the sampling cavity, and a third control valve is provided on the communication pipe, the third control valve is suitable for controlling the flow of the solution in the communication pipe;

[0012] a sampling and measuring unit, the sampling and measuring unit being disposed in the sampling container and being provided with a dissolved oxygen measuring head adapted to measure the dissolved oxygen content of the solution in the sampling cavity;

[0013] a third gas path, the third gas path passing through the sampling container and communicating with the sampling cavity, the third gas path being adapted to introduce gas into the sampling cavity of the sampling container;

[0014] A fourth control valve is provided on the third gas path, and the fourth control valve is suitable for controlling the gas flow of the third gas path;

[0015] a fourth gas path, the fourth gas path passing through the sampling container and communicating with the sampling cavity, the fourth gas path being adapted to discharge gas entering the sampling cavity of the sampling container;

[0016] A fifth control valve is provided on the fourth gas path, and the fifth control valve is suitable for controlling the gas flow in the fourth gas path.

[0017] Furthermore, on the sealed container, the air outlet of the first air path is located lower than the air inlet of the second air path.

[0018] Furthermore, in order to facilitate obtaining solution samples from the bottom, the communication pipeline includes a sampling tube that is arranged in the solution storage cavity of the sealed container and extends downward.

[0019] Furthermore, a specific type of dissolved oxygen measuring head is provided, wherein the dissolved oxygen measuring head of the sampling and measuring unit is a dissolved oxygen sensor.

[0020] Furthermore, in order to prevent backflow from affecting measurement, a one-way valve is further provided on at least one of the first gas path, the second gas path, the third gas path and the fourth gas path.

[0021] Furthermore, in order to prevent the solution from reacting with the gas, the first gas path and the third gas path are both connected to an inert gas source, and the first gas path and the third gas path are suitable for respectively introducing inert gas into the solution storage chamber of the sealed container and the sampling chamber of the sampling container.

[0022] Furthermore, in order to facilitate the solution to smoothly enter and exit the sampling container, the communication pipe is connected to the sampling cavity through the lower part of the sampling container.

[0023] By adopting the above technical solution, the utility model has the following beneficial effects:

[0024] In the present invention, first, the third control valve of the connecting pipe is closed, the first control valve of the first air circuit and the second control valve of the second air circuit are opened, gas is introduced into the solution storage chamber of the sealed container through the first air circuit, and other gases in the solution storage chamber are discharged. Ventilation is continued for 24 hours to ensure the purity and stability of the gas in the sealed container. Then, the second control valve of the second air circuit and the fourth control valve of the third air circuit are closed, and then the fifth control valve of the fourth air circuit is opened, while the first control valve of the first air circuit is kept in an open state. At this time, the gas in the first air circuit and the pressure in the solution storage chamber of the sealed container are used to press the solution to be tested in the solution storage chamber into the sampling chamber of the sampling container through the connecting pipe. The dissolved oxygen content of the solution to be tested is measured using a dissolved oxygen measuring head located in the sampling chamber.

[0025] After the measurement is complete, the first control valve of the first gas path and the fifth control valve of the fourth gas path are closed, and the second control valve of the second gas path and the fourth control valve of the third gas path are reopened to pressurize the sampled solution back into the solution storage chamber of the sealed container through the connecting pipe. This closed gas path control and solution transmission method effectively avoids interference with dissolved oxygen measurement from external gases, ensures the accuracy of dissolved oxygen data in the solution, and significantly improves the accuracy and reliability of the measurement.

[0026] Furthermore, both the first and third gas paths introduce inert gases. By installing a sampling tube within the sealed container's solution storage chamber, the connecting tube extends to the lower portion of the chamber. During sampling, the solution is drawn from the bottom of the container. This prevents interference with dissolved oxygen measurement caused by bubbles in the upper solution, further improving the representativeness of the sampling and the accuracy of the measurement results.

[0027] In summary, this utility model patent can not only effectively isolate the interference of the external environment on the dissolved oxygen measurement, improve the accuracy and stability of the dissolved oxygen measurement, but also directly obtain the dissolved oxygen content of the solution during the experiment, thereby realizing efficient and accurate dissolved oxygen measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a device for measuring dissolved oxygen content in a solution according to the present invention. DETAILED DESCRIPTION

[0029] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0030] like Figure 1As shown, a device for measuring dissolved oxygen content in a solution comprises:

[0031] A sealed container 1 is provided with a solution storage cavity therein, the solution storage cavity is suitable for accommodating a solution to be tested, the sealed container 1 is provided with a solution inlet and a solution outlet connected to the solution storage cavity, and the solution inlet and the solution outlet are both provided with an on-off valve;

[0032] a first gas path 2, the first gas path 2 passing through the sealed container 1 and communicating with the solution storage cavity, the first gas path 2 being adapted to introduce gas into the solution storage cavity of the sealed container 1;

[0033] A first control valve 21 is provided on the first gas path 2, and the first control valve 21 is suitable for controlling the gas flow in the first gas path 2;

[0034] a second gas path 3, the second gas path 3 passing through the sealed container 1 and communicating with the solution storage chamber, the second gas path 3 being adapted to discharge gas from the solution storage chamber of the sealed container 1;

[0035] A second control valve 31 is provided on the second gas path 3, and the second control valve 31 is suitable for controlling the gas flow in the second gas path 3;

[0036] A sampling container 4 is provided with a sampling cavity therein, a communication pipe 42 is provided between the sampling container 4 and the sealed container 1, the communication pipe 42 connects the solution storage cavity and the sampling cavity, and a third control valve 41 is provided on the communication pipe 42, the third control valve 41 is suitable for controlling the flow of the solution in the communication pipe 42;

[0037] The sampling and measuring unit 5 is disposed in the sampling container 4 and is provided with a dissolved oxygen measuring head, which is suitable for measuring the dissolved oxygen content of the solution in the sampling cavity;

[0038] A third gas path 6 passes through the sampling container 4 and is connected to the sampling cavity. The third gas path 6 is suitable for introducing gas into the sampling cavity of the sampling container 4;

[0039] A fourth control valve 61 is provided on the third gas path 6, and the fourth control valve 61 is suitable for controlling the gas flow of the third gas path 6;

[0040] a fourth gas path 7, which passes through the sampling container 4 and is connected to the sampling cavity. The fourth gas path 7 is suitable for discharging gas that has entered the sampling cavity of the sampling container 4;

[0041] A fifth control valve 71 is provided on the fourth gas path 7 , and the fifth control valve 71 is suitable for controlling the gas flow in the fourth gas path 7 .

[0042] In this embodiment, if Figure 1As shown, first close the third control valve 41 of the connecting pipe, open the first control valve 21 of the first gas circuit and the second control valve 31 of the second gas circuit, and introduce gas into the solution storage chamber of the sealed container through the first gas circuit 2, and discharge other gases in the solution storage chamber, and maintain this for 24 hours to ensure the purity and stability of the gas in the sealed container. Then, close the second control valve 31 of the second gas circuit 3 and the fourth control valve 61 of the third gas circuit 6, and then open the fifth control valve 71 of the fourth gas circuit 7, while keeping the first control valve 21 of the first gas circuit 2 in an open state. At this time, the gas in the first gas circuit 2 and the pressure in the solution storage chamber of the sealed container are used to press the solution to be tested in the solution storage chamber into the sampling chamber of the sampling container 4 through the connecting pipe 42. The dissolved oxygen content of the solution to be tested is measured using a dissolved oxygen measuring head located in the sampling chamber.

[0043] After the measurement is completed, the first control valve 21 of the first gas circuit 2 and the fifth control valve 71 of the fourth gas circuit 7 are closed, and the second control valve 31 of the second gas circuit 3 and the fourth control valve 61 of the third gas circuit 6 are reopened to pressurize the sampled solution back into the solution storage chamber of the sealed container through the connecting pipe 42. This closed gas circuit control and solution transmission method effectively avoids interference with the dissolved oxygen measurement from external gases, ensures the accuracy of the dissolved oxygen data in the solution, and significantly improves the accuracy and reliability of the measurement.

[0044] Specifically, such as Figure 1 As shown, on the sealed container 1 , the air outlet of the first air path 2 is located lower than the air inlet of the second air path 3 .

[0045] In this embodiment, if Figure 1 As shown, on sealed container 1, the outlet of first gas path 2 is positioned lower than the inlet of second gas path 3. This ensures that the gas introduced through first gas path 2 is evenly distributed within the solution storage chamber of sealed container 1, and that other gases in the solution storage chamber are discharged from the upper portion of the container, avoiding dead corners or gas stagnation. Furthermore, the higher position of the inlet of second gas path 3 allows for contact with the gas within sealed container 1, more efficiently removing other gases from the solution storage chamber within sealed container 1.

[0046] Specifically, such as Figure 1 As shown, the communication pipe 42 includes a sampling tube arranged in the solution storage chamber of the sealed container 1 and extending downward.

[0047] In this embodiment, if Figure 1As shown, the connecting pipe 42 includes a sampling tube that is arranged in the solution storage chamber of the sealed container 1 and extends downward, and the bottom of the sampling tube is located in the lower area of ​​the solution storage chamber of the sealed container 1. This ensures that when sampling, the solution deeper in the solution storage chamber can smoothly pass through the connecting pipe 42 into the sampling cavity of the sampling container 4. The problem of inaccurate dissolved oxygen content caused by sampling only from the surface of the solution can be avoided. In particular, when the solution may be stratified, the solution at the bottom can better reflect the true dissolved oxygen level of the solution in the entire sealed container 1. In addition, the downward extension design of the sampling tube can also ensure that when multiple sampling is required, even if the solution in the solution storage chamber of the sealed container 1 is reduced, sufficient solution can still be successfully collected for measurement through the sampling tube, avoiding the situation where sampling cannot be performed due to a drop in the liquid level.

[0048] Specifically, such as Figure 1 As shown, the dissolved oxygen measuring head of the sampling and measuring unit 5 is a dissolved oxygen sensor.

[0049] Specifically, such as Figure 1 As shown, one-way valves are provided in the first gas path 2 , the second gas path 3 , the third gas path 6 and the fourth gas path 7 .

[0050] Specifically, such as Figure 1 As shown, the first gas path 2 and the third gas path 6 are both connected to an inert gas source, and the first gas path 2 and the third gas path 6 are suitable for introducing inert gas into the solution storage chamber of the sealed container 1 and the sampling chamber of the sampling container 4 respectively.

[0051] Specifically, such as Figure 1 As shown, the communication pipe 42 is connected to the sampling cavity through the lower part of the sampling container 4.

[0052] In this embodiment, if Figure 1 As shown, the dissolved oxygen sensor can measure the dissolved oxygen content of the solution in the sampling chamber in real time and accurately. The dissolved oxygen sensor can select a suitable model according to the actual application requirements to adapt to the chemical properties of different types of solutions; the function of the one-way valve is to ensure that the gas or liquid can only flow in one direction to prevent the gas from flowing back or the solution from flowing back. The setting of the one-way valve can effectively avoid the measurement error caused by the gas backflow. The first gas path 2 and the third gas path 6 are both connected to the inert gas source. Inert gas, such as nitrogen or argon. It can prevent other gases from reacting with the solution to be tested, thereby affecting the measurement results of dissolved oxygen. Using inert gas as the working gas in the gas path can ensure that the dissolved oxygen content in the solution does not change due to the entry of gas, while maintaining the stability of the entire measurement environment and reducing the interference of external environmental factors on the measurement.

[0053] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for measuring the dissolved oxygen content of a solution, characterized in that: include: A sealed container (1), wherein a solution storage cavity is provided in the sealed container, the solution storage cavity is suitable for accommodating a solution to be tested, the sealed container (1) is provided with a solution inlet and a solution outlet connected to the solution storage cavity, and the solution inlet and the solution outlet are both provided with a switch valve; a first gas path (2), the first gas path (2) passing through the sealed container (1) and communicating with the solution storage chamber, the first gas path (2) being suitable for introducing gas into the solution storage chamber of the sealed container (1); A first control valve (21) is provided on the first gas path (2), and the first control valve (21) is suitable for controlling the flow of gas in the first gas path (2); a second gas path (3), the second gas path (3) passing through the sealed container (1) and communicating with the solution storage chamber, the second gas path (3) being suitable for discharging gas from the solution storage chamber of the sealed container (1); A second control valve (31) is provided on the second gas path (3), and the second control valve (31) is suitable for controlling the gas flow in the second gas path (3); A sampling container (4), wherein a sampling cavity is provided in the sampling container (4), a communication pipe (42) is provided between the sampling container (4) and the sealed container (1), the communication pipe (42) connects the solution storage cavity and the sampling cavity, and a third control valve (41) is provided on the communication pipe (42), and the third control valve (41) is suitable for controlling the flow of the solution in the communication pipe (42); A sampling and measuring unit (5), the sampling and measuring unit (5) being arranged in the sampling container (4), the sampling and measuring unit (5) being provided with a dissolved oxygen measuring head, the dissolved oxygen measuring head being suitable for measuring the dissolved oxygen content of the solution in the sampling cavity; a third gas path (6), the third gas path (6) passing through the sampling container (4) and communicating with the sampling cavity, the third gas path (6) being suitable for introducing gas into the sampling cavity of the sampling container (4); The third gas path (6) is provided with a fourth control valve (61), and the fourth control valve (61) is suitable for controlling the gas flow of the third gas path (6); a fourth gas path (7), the fourth gas path (7) passing through the sampling container (4) and communicating with the sampling cavity, the fourth gas path (7) being suitable for discharging gas entering the sampling cavity of the sampling container (4); A fifth control valve (71) is provided on the fourth gas path (7), and the fifth control valve (71) is suitable for controlling the gas flow of the fourth gas path (7).

2. The device for measuring dissolved oxygen content of a solution according to claim 1, characterized in that: On the sealed container (1), the air outlet of the first air path (2) is located lower than the air inlet of the second air path (3).

3. The device for measuring dissolved oxygen content of a solution according to claim 1, wherein The communication pipe (42) comprises a sampling tube arranged in the solution storage cavity of the sealed container (1) and extending downward.

4. The device for measuring dissolved oxygen content of a solution according to claim 1, characterized in that: The dissolved oxygen measuring head of the sampling and measuring unit (5) is a dissolved oxygen sensor.

5. The device for measuring dissolved oxygen content of a solution according to claim 1, characterized in that: A one-way valve is also provided on at least one of the first gas path (2), the second gas path (3), the third gas path (6) and the fourth gas path (7).

6. The device for measuring dissolved oxygen content of a solution according to claim 1, characterized in that: The first gas path (2) and the third gas path (6) are both connected to an inert gas source, and the first gas path (2) and the third gas path (6) are suitable for respectively introducing inert gas into the solution storage chamber of the sealed container (1) and the sampling chamber of the sampling container (4).

7. The device for measuring dissolved oxygen content of a solution according to claim 1, characterized in that: The communicating pipe (42) is connected to the sampling cavity through the lower part of the sampling container (4).

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