A test container for monitoring

Abstract

The utility model provides a kind of test container for monitoring, it is related to experimental equipment technical field, including closed test container, including the dissolved oxygen concentration test system of liquid outlet pipe, dissolved oxygen instrument, circulating pump and liquid return pipe connected in turn, liquid outlet pipe is located closed test container lower part, liquid return pipe is arranged in closed test container top;Including pH meter probe and pH meter's pH value monitoring system, pH meter probe is fixedly installed on closed test container and extends to closed test container, and pH meter is electrically connected with pH meter probe by wire;And exhaust system, exhaust system is connected in closed test container top.The utility model can several times on-line monitoring the pH value and the concentration of dissolved oxygen of test solution in closed test container, after completing dissolved oxygen concentration test, make test solution return closed test container again, guarantee the pH value and the dissolved oxygen concentration of test solution in test process meet standard requirement.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, and in particular to an experimental container for monitoring. Background Technology

[0002] In corrosion testing of metallic materials, the relevant standards for testing solutions are becoming increasingly stringent. Furthermore, after the test solution reaches the required oxygen concentration, it must be returned to a sealed test container, and the pH value of the solution within that container must be tested during this process. Regarding this:

[0003] First, the conventional test containers currently on the market have relatively limited functions, often only capable of single functions such as solution containment or simple parameter testing. This requires testers to use multiple different test devices to complete various operations, increasing the complexity and cumbersomeness of the operation process. This not only reduces test efficiency but also makes it easy for test results to deviate due to operational errors.

[0004] Secondly, most test containers cannot achieve real-time online monitoring of solution pH and dissolved oxygen concentration. Test personnel need to manually sample and test periodically, which is not only time-consuming and labor-intensive, but the sampling process may also introduce external interference, leading to biased test results and making it difficult to accurately reflect the true state of the test solution in a closed environment.

[0005] Furthermore, when conducting dissolved oxygen concentration tests, existing test containers cannot guarantee that the solution will be returned to the sealed container intact and smoothly after the test. If the solution cannot be completely returned, the surface area of ​​the sample and the volume ratio of the solution will change, failing to meet the standard requirements, thus affecting the accuracy and reliability of the entire test.

[0006] Furthermore, as testing requirements become increasingly stringent, customer needs are also diversifying: multiple daily pH tests of the solution are required throughout the testing period, along with continuous monitoring of dissolved oxygen concentration deviations. However, the existing testing containers have limitations in their functional design, making it impossible to meet these higher-frequency and more comprehensive monitoring needs. This results in significant risks in controlling solution conditions during the testing process, making it difficult to guarantee that the test results meet the standard requirements.

[0007] Therefore, there is an urgent need to develop a new type of test container to solve the above problems and ensure the accuracy and standardization of corrosion tests on metallic materials. Utility Model Content

[0008] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a test container for monitoring, capable of monitoring the pH value and dissolved oxygen concentration of the test solution in the sealed test container online several times. After the dissolved oxygen concentration test is completed, the test solution is returned to the sealed test container to ensure that the pH value and dissolved oxygen concentration of the test solution meet the standard requirements during the test.

[0009] A test container for monitoring according to an embodiment of the present invention includes:

[0010] Sealed test container, and

[0011] The dissolved oxygen concentration testing system includes an outlet pipe, a dissolved oxygen meter, a circulating pump, and a return pipe connected in sequence. The outlet pipe is located in the lower part of the sealed test container, and the return pipe is located in the top of the sealed test container.

[0012] A pH monitoring system includes a pH meter probe and a pH meter. The pH meter probe is fixedly installed on a sealed test container and extends into the sealed test container. The pH meter is electrically connected to the pH meter probe via a wire.

[0013] The exhaust system includes a gas cylinder, an inlet pipe, and an outlet pipe. The gas cylinder and the inlet pipe are connected through an inlet pipe, and both the inlet pipe and the outlet pipe are connected to the top of the sealed test container.

[0014] According to an embodiment of the present invention, a test container for monitoring has at least the following technical effects: The test container of the present invention enables online monitoring of the pH value and dissolved oxygen concentration of the test solution in a sealed test container; the gas exhaust system effectively removes oxygen from the test solution, meeting the requirements of different materials for dissolved oxygen concentration in the test solution; the dissolved oxygen concentration testing system enables online monitoring of the dissolved oxygen concentration of the test solution and the recycling of the solution, ensuring that the ratio of sample to test solution meets the standard; the pH value monitoring system can monitor the pH value of the test solution in real time, ensuring that the pH and dissolved oxygen concentration of the solution meet the standard requirements during the test, improving the accuracy and reliability of the test, and has good practicality and promotional value.

[0015] According to some embodiments of the present invention, the sealed test container includes a container body and a container top cover, and the container top cover is sealed and installed on the top of the container body by sealing screws.

[0016] According to some embodiments of this utility model, a liquid outlet valve is installed on the liquid outlet pipe.

[0017] According to some embodiments of the present invention, a liquid storage tank is provided at the bottom of the sealed test container, and the pH meter probe is inserted into the liquid storage tank.

[0018] According to some embodiments of the present invention, the liquid storage tank is cone-shaped, and a drain outlet is provided at the bottom of the liquid storage tank; several annular guide grooves are provided on the inner wall of the liquid storage tank; and a solution stirring device is provided inside the liquid storage tank.

[0019] According to some embodiments of the present invention, the exhaust system further includes an alkaline solution tank, and the exhaust pipe is connected to the alkaline solution tank via an exhaust pipeline.

[0020] According to some embodiments of the present invention, a flow control valve and a flow meter are installed on the return pipe.

[0021] According to some embodiments of this utility model, a gas flow regulator and a pressure sensor are provided between the gas cylinder and the inlet pipe.

[0022] According to some embodiments of the present invention, a pH monitoring system is installed at any two heights on the sealed test container.

[0023] According to some embodiments of the present invention, a dissolved oxygen sensor is installed inside the sealed test container, and the dissolved oxygen sensor is electrically connected to a dissolved oxygen meter.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a test container for monitoring according to the present invention.

[0027] The following are the symbols and their meanings: 1. Gas cylinder; 2. Gas outlet pipeline; 3. Alkali solution tank; 4. Dissolved oxygen meter; 5. Liquid outlet valve; 6. Liquid outlet pipe; 7. Circulation pump; 8. Liquid return pipe; 9. Gas inlet pipeline; 10. Gas inlet pipe; 11. Sealing screw; 12. Container lid; 13. Sealed test container; 14. pH meter probe; 15. pH meter; 16. Liquid storage tank; 17. Gas outlet pipe.

[0028] The purpose, features, and advantages of this accompanying drawing will be further explained in conjunction with the embodiments and with reference to the accompanying drawing. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments provided by this utility model without inventive effort are within the scope of protection of this utility model.

[0030] Obviously, the accompanying drawings described below are merely some examples or embodiments of this utility model. Those skilled in the art can apply this utility model to other similar scenarios without any creative effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this utility model, any changes to the design, manufacturing, or production methods based on the disclosed technical content are merely conventional technical means and should not be construed as insufficient disclosure of this utility model.

[0031] See Figure 1 As shown, a test container for monitoring according to an embodiment of the present invention includes a sealed test container 13, a dissolved oxygen concentration testing system, a pH monitoring system, and an exhaust system; wherein,

[0032] The dissolved oxygen concentration testing system includes an outlet pipe 6, a dissolved oxygen meter 4, a circulating pump 7, and a return pipe 8 connected in sequence. The outlet pipe 6 is located in the lower part of the sealed test container 13, and the return pipe 8 is located at the top of the sealed test container 13.

[0033] The pH monitoring system includes a pH meter probe 14 and a pH meter 15. The pH meter probe 14 is fixedly installed on the sealed test container 13 and extends into the sealed test container 13. The pH meter 15 is electrically connected to the pH meter probe 14 via a wire.

[0034] The exhaust system includes a gas cylinder 1, an inlet pipe 10, and an outlet pipe 17. The gas cylinder 1 is connected to the inlet pipe 10 via an inlet pipe 9. Both the inlet pipe 10 and the outlet pipe 17 are connected to the top of the sealed test container 13.

[0035] Specifically, this test container is directly applied to Method B (bending beam test), Method C (C-ring test), and Method D (double cantilever beam test) of the NACE TM0177 standard (Laboratory testing standard for metals' resistance to sulfide stress cracking and stress corrosion cracking in H2S environment), as well as the NACE TM0316 standard (four-point bending test). The NACE TM0177 standard requires that for low-alloy steels with a specified minimum yield strength (SMYS) ≤ 552 MPa, the dissolved oxygen content in the test solution should be < 50 ppb; for low-alloy steels and corrosion-resistant alloys with a specified minimum yield strength (SMYS) above 552 MPa, it should be below 10 ppb; and after the test solution reaches the required oxygen concentration, it needs to be returned to the sealed test container. Simultaneously, the pH value of the test solution needs to be tested at the beginning and end of the test. The sealed test container 13 is the main structure of this test container, used to contain the test solution and the sample. In one specific embodiment, the sealed test container 13 includes a container body and a container cover 12. The container cover 12 is sealed and installed on top of the container body using sealing screws 11, thereby forming the sealed test container 13. The dissolved oxygen concentration testing system includes an outlet pipe 6, a dissolved oxygen meter 4, a circulation pump 7, and a return pipe 8. The outlet pipe 6 is located in the lower part of the sealed test container 13, and the return pipe 8 is located at the top of the sealed test container 13. The dissolved oxygen meter 4 and the circulation pump 7 are connected by a pipeline. When it is necessary to test the dissolved oxygen concentration, the test solution flows through the outlet pipe 6 to the dissolved oxygen meter 4 for concentration testing. After the test is completed, the test solution is returned to the sealed test container 13 through the return pipe 8 by the circulation pump 7, ensuring that the test solution can return to the original container and avoiding the situation where the surface area of ​​the sample and the volume ratio of the test solution do not meet the standard requirements. This dissolved oxygen concentration testing system realizes online monitoring of the dissolved oxygen concentration of the test solution and recycling of the test solution. The pH monitoring system includes a pH meter probe 14 and a pH meter 15. pH meter probe 14 is fixedly installed on the upper part of the sealed test container 13, with its lower end extending into the test solution, enabling it to sense changes in the solution's pH value in real time. pH meter 15 is connected to pH meter probe 14 via a wire, transmitting the pH signal sensed by probe 14 to pH meter 15. pH meter 15 displays the pH value at any time, facilitating real-time monitoring of the test solution's pH value by the testing personnel. This ensures that the pH value of the test solution meets standard requirements during the pH test, such as an initial pH of 2.6-2.8 and a final pH not exceeding 4.0. In the exhaust system, gas cylinder 1 is connected to inlet pipe 10 via inlet pipe 9. Inlet pipe 10 extends into the sealed test container 13. When gas cylinder 1 is ventilated, gas enters inlet pipe 10 through inlet pipe 9 and then reaches the sealed test container 13, expelling oxygen from the test solution within the sealed test container 13.

[0036] In this embodiment, the gas exhaust system can effectively remove oxygen from the test solution, meeting the requirements of different materials for dissolved oxygen concentration in the test solution; the dissolved oxygen concentration testing system enables online monitoring of the dissolved oxygen concentration in the test solution and recycling of the solution, ensuring that the ratio of sample to test solution meets the standard; the pH monitoring system can monitor the pH value of the test solution in real time, ensuring that the pH and dissolved oxygen concentration of the solution meet the standard requirements during the test, improving the accuracy and reliability of the test, and has good practicality and promotion value.

[0037] The present invention provides a test container for monitoring, and the specific implementation steps are as follows:

[0038] First, place the sample into the sealed test container 13 and add an appropriate amount of test solution to the sealed test container 13;

[0039] Then, open gas cylinder 1 to allow inert gas to enter the sealed test container 13 through inlet pipe 9 and inlet pipe 10, and discharge the oxygen in the test solution in the test container through outlet pipe 17. When the dissolved oxygen concentration in the solution reaches the corresponding standard requirements (dissolved oxygen level below 50 ppb for low alloy steel with strength level below 552 MPa, and dissolved oxygen below 10 ppb for low alloy steel and corrosion-resistant alloy with strength level above 552 MPa), close gas cylinder 1.

[0040] During the experiment, the pH value of the test solution is sensed in real time by pH meter probe 14 and the signal is transmitted to pH meter 15 for display. The experimenters can observe the changes in pH value of the test solution at any time.

[0041] When it is necessary to test the dissolved oxygen concentration, the test solution is flowed to the dissolved oxygen meter 4 through the outlet pipe 6 of the dissolved oxygen concentration testing system for concentration testing. After the test is completed, the circulation pump 7 is started to send the solution back to the sealed container through the return pipe 8, ensuring that all the test solution returns to the original sealed test container.

[0042] Throughout the experiment, the pH value and dissolved oxygen concentration of the test solution were continuously monitored to ensure that they met the standard requirements until the end of the experiment.

[0043] In some specific embodiments of this utility model, an outlet valve 5 is installed on the outlet pipe 6. Specifically, according to experimental requirements, the outlet valve 5 flexibly controls the process of the test solution being discharged from the sealed test container 13 to the dissolved oxygen meter 4. When dissolved oxygen concentration testing is not required, closing the outlet valve 5 can prevent the test solution from flowing out, ensuring that the test solution reacts stably within the sealed test container 13. When dissolved oxygen concentration testing is required, opening the outlet valve 5 allows the solution to flow out smoothly, and the flow rate of the test solution can be controlled by adjusting the valve opening of the outlet valve 5, thereby adapting to the detection requirements of the dissolved oxygen meter 4. Furthermore, the outlet valve 5 precisely controls the amount of test solution discharged, avoiding the impact of excessive or insufficient discharge on the test results. Further, the outlet valve 5 can also prevent the test solution from flowing back into the sealed test container 13.

[0044] In some specific embodiments of this invention, a liquid storage tank 16 is provided at the bottom of the sealed test container 13, and a pH meter probe 14 is inserted into the liquid storage tank 16. Specifically, a liquid storage tank 16 protrudes from the bottom of the sealed test container, and the pH meter probe 14 is inserted into the liquid storage tank 16. The pH meter probe 14 is electrically connected to a pH meter 15. Since the liquid storage tank 16 is located at the bottom of the sealed test container 13, the test solution at the bottom of the sealed test container 13 is relatively stable, and the pH value of the test solution obtained through the liquid storage tank 16 is relatively accurate.

[0045] In some specific embodiments of this utility model, the storage tank 16 is conical in shape, with a drain outlet at the bottom; several annular guide channels are provided on the inner wall of the storage tank 16; and a solution stirring device is installed inside the storage tank 16. Specifically, the storage tank 16 is designed with a conical shape, and a drain outlet is provided at the bottom to facilitate the complete drainage of the test solution after the test. Simultaneously, several annular guide channels are provided on the inner wall of the storage tank 16. When the test solution flows back, the guide channels guide the test solution to a uniform distribution, reducing the impact of test solution sloshing on the test results, and further facilitating the collection and flow of the test solution, thus improving the accuracy of the test. Furthermore, a solution stirring device, such as a magnetic stirrer or a paddle stirrer, is added inside the sealed test container 13. The solution stirring device is activated during the test solution circulation process to make the test solution more uniformly mixed, ensuring the accuracy of the test data.

[0046] In some specific embodiments of this utility model, the exhaust system further includes an alkaline solution tank 3, and the exhaust pipe 17 is connected to the alkaline solution tank 3 via the exhaust pipe 2. When the gas cylinder 1 is vented, the gas enters the intake pipe 10 through the intake pipe 9, and then reaches the sealed test container 13, venting the oxygen in the test solution inside the container. The vented gas then enters the alkaline solution tank 3 sequentially through the exhaust pipe 17 and the exhaust pipe 2. The alkaline solution tank 3 treats the vented gas to prevent environmental pollution and ensures that impurities in the vented gas do not affect the test results. Before the test begins, this exhaust system uses inert gas to vent the oxygen in the test solution of the sealed test container 13 containing the sample. For low-alloy steel with a strength level below 552 MPa, the dissolved oxygen level is kept below 50 ppb; for low-alloy steel and corrosion-resistant alloys with a strength level above 552 MPa, the dissolved oxygen level is kept below 10 ppb, meeting the test requirements for different materials.

[0047] In some specific embodiments of this utility model, a flow control valve and a flow meter are installed on the return pipe 8. Specifically, the flow control valve is adjusted to precisely control the return speed and flow rate of the test solution, and the flow meter displays the flow rate data of the returned test solution in real time, ensuring that the test solution after testing can be completely and accurately returned to the original sealed test container 13, maintaining the surface area of ​​the sample and the volume ratio of the test solution in accordance with the standard requirements.

[0048] In some specific embodiments of this utility model, a gas flow regulator and a pressure sensor are installed between the gas cylinder 1 and the inlet pipe 9. Specifically, the gas flow regulator precisely adjusts the flow rate of inert gas into the sealed test container 13 according to the dissolved oxygen concentration requirements of different material samples. For example, for high-requirement corrosion-resistant alloys, the gas inlet rate is reduced to ensure more complete oxygen discharge without causing drastic fluctuations in the solution. The pressure sensor monitors the gas pressure in the inlet pipe 9 in real time to prevent excessively high gas pressure from damaging the sealed test container 13 or excessively low pressure from causing insufficient oxygen discharge. This ensures that the dissolved oxygen concentration in the solution can be quickly and efficiently reduced to the standard requirements before the test begins. Specifically, for low-alloy steel with a minimum yield strength (SMYS) ≤ 552 MPa, the dissolved oxygen content is < 50 ppb; for low-alloy steel and corrosion-resistant alloys with a minimum yield strength (SMYS) above 552 MPa, the dissolved oxygen content is below 10 ppb.

[0049] In some specific embodiments of this invention, pH monitoring systems are installed at any two heights on the sealed test container 13. Specifically, pH monitoring systems are installed at different heights on the sealed test container 13, for example, at heights of 5 cm and 15 cm from the bottom of the sealed test container 13. The pH distribution map inside the test solution is plotted using the monitoring results of the pH monitoring system, visually presenting the acidity and alkalinity differences at different heights of the test solution, thereby improving detection accuracy. Furthermore, pH monitoring systems are installed at different positions on the sealed test container 13 to reflect the overall condition of the test solution.

[0050] In some specific embodiments of this invention, a dissolved oxygen sensor is installed inside the sealed test container 13, and the dissolved oxygen sensor is electrically connected to the dissolved oxygen meter 4. Specifically, the dissolved oxygen sensor is connected to the external dissolved oxygen meter 4 via a data cable, enabling it to transmit the dissolved oxygen concentration data of the test solution inside the sealed test container 13 to the dissolved oxygen meter 4 for display and recording in real time. Simultaneously, a dissolved oxygen concentration alarm threshold is set. When the dissolved oxygen concentration detected by the dissolved oxygen meter 4 exceeds the standard range, the dissolved oxygen meter 4 automatically issues an audible and visual alarm signal to remind the test personnel to take timely measures to adjust the concentration, ensuring that the dissolved oxygen concentration always meets the standard requirements during the test.

[0051] It should be noted that this utility model is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and function as the technical concept within the scope of this utility model are included within the technical scope of this utility model. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, are also included within the scope of this utility model without departing from the spirit of this utility model.

Claims

1. A test container for monitoring, characterized in that It comprises: A sealed test container (13) and a dissolved oxygen concentration test system, which comprises a liquid outlet pipe (6), a dissolved oxygen meter (4), a circulating pump (7) and a liquid return pipe (8) connected in sequence, the liquid outlet pipe (6) is arranged at the lower part of the sealed test container (13), and the liquid return pipe (8) is arranged at the top of the sealed test container (13); A pH value monitoring system, which comprises a pH meter probe (14) and a pH meter (15), the pH meter probe (14) is fixedly installed on the sealed test container (13) and extends into the sealed test container (13), and the pH meter (15) is electrically connected with the pH meter probe (14) through a wire; An exhaust system, which comprises a gas cylinder (1), an air inlet pipe (10) and an air outlet pipe (17), the gas cylinder (1) is connected with the air inlet pipe (10) through an air inlet pipe (9), and the air inlet pipe (10) and the air outlet pipe (17) are both connected at the top of the sealed test container (13).

2. A test vessel for monitoring according to claim 1, characterized in that The sealed test container (13) comprises a container body and a container upper cover (12), and the container upper cover (12) is tightly installed on the top of the container body through a sealing screw (11).

3. A test vessel for monitoring according to claim 1, characterized in that A liquid outlet valve (5) is installed on the liquid outlet pipe (6).

4. A test vessel for monitoring according to claim 1, characterized in that A liquid storage groove (16) is arranged at the bottom of the sealed test container (13), and the pH meter probe (14) is inserted into the liquid storage groove (16).

5. A test vessel for monitoring according to claim 4, characterized in that The shape of the liquid storage groove (16) is a conical structure, a drainage port is arranged at the bottom of the liquid storage groove (16), a plurality of annular flow guide grooves are arranged on the inner wall of the liquid storage groove (16), and a solution stirring device is arranged in the liquid storage groove (16).

6. A test vessel for monitoring according to claim 1, characterized in that The exhaust system further comprises a lye pool (3), and the air outlet pipe (17) is connected to the lye pool (3) through an air outlet pipe (2).

7. A test vessel for monitoring according to claim 1, characterized in that A flow control valve and a flow meter are installed on the liquid return pipe (8).

8. A test vessel for monitoring according to claim 1, characterized in that A gas flow regulator and a pressure sensor are arranged between the gas cylinder (1) and the air inlet pipe (9).

9. A test vessel for monitoring according to claim 1, characterized in that The pH value monitoring system is arranged at any two heights of the sealed test container (13).

10. A test vessel for monitoring according to claim 1, characterized in that A dissolved oxygen sensor is installed in the sealed test container (13), and the dissolved oxygen sensor is electrically connected with the dissolved oxygen meter (4).

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