Underground water automatic monitoring sample protection device

Abstract

The utility model discloses an underground water automatic monitoring sample protection device which comprises a sample water barrel, a sealing cover is arranged on the top of the sample water barrel, and a sampling opening and an emptying opening are formed in the bottom of the sample water barrel and used for sampling and emptying. A high-liquid-level switch, a middle-liquid-level switch and a low-liquid-level switch are sequentially arranged on a barrel body of the sample water barrel from top to bottom and used for setting liquid levels, a pressure relief opening is formed in the top end of the barrel body of the sample water barrel, a sample outlet is formed in the bottom end of the barrel body of the sample water barrel, and a gas washing / liquid washing opening is formed in the upper portion of the barrel body of the sample water barrel and used for introducing nitrogen or clean water. A manual sampling opening is formed in the lower part of the sample water barrel body and is used for manual sampling.

Description

Technical Field

[0001] The utility model relates to the field of groundwater monitoring, in particular to a groundwater automatic monitoring sample protection device used for preserving samples during groundwater sampling. Background Art

[0002] Groundwater is not only an indispensable natural resource, but also an important environmental factor and ecological support condition. It is necessary to strengthen the supervision of groundwater, and to strengthen the supervision of groundwater, the groundwater quality must be monitored first.

[0003] Automatic groundwater monitoring can monitor the trend of water quality changes in real time, play an early warning role in groundwater pollution accidents, and provide timely scientific basis for groundwater environmental management. Because groundwater may have completely different storage conditions underground and after sampling, it is easy for physical, chemical or biological reactions to occur and components to change during the process from sampling to the beginning of analysis. Some possible biochemical reactions are as follows: 1. Certain compounds are oxidized when they come into contact with oxygen in the atmosphere, such as certain organic compounds, divalent iron and sulfides. 2. The water sample absorbs carbon dioxide in the air, which may change the pH value, conductivity and dissolved carbon dioxide concentration of the water sample. Summary of the invention

[0004] The utility model provides a groundwater automatic monitoring sample protection device that isolates air and protects water samples. As a reasonable supplement to existing technical solutions and products, the utility model is realized through the following technical solutions:

[0005] A groundwater automatic monitoring sample protection device, characterized in that: the groundwater automatic monitoring sample protection device comprises a sample water bucket, a sealing cover is provided on the top of the sample water bucket, a sampling port and an emptying port are provided at the bottom of the sample water bucket for sampling and emptying, a high liquid level switch, a middle liquid level switch and a low liquid level switch are provided on the body of the sample water bucket from top to bottom to set the liquid level, a pressure relief port is provided at the top of the sample water bucket body, a sample outlet is provided at the bottom, an air wash / liquid wash port is provided at the upper part of the sample water bucket body for introducing nitrogen or clean water, and a manual sampling port is provided at the lower part of the sample water bucket body for manual sampling.

[0006] Preferably, the sample water bucket is also connected to a liquid level transparent observation tube for observing the liquid level from the outside.

[0007] Preferably, the groundwater automatic monitoring sample protection device also includes a PSA (pressure swing adsorption) nitrogen generator for producing high-purity nitrogen.

[0008] The utility model has the following beneficial effects: the utility model utilizes the principle that nitrogen is an inert gas that generally does not react with other substances, adopts a nitrogen generator to manufacture high-purity nitrogen and then passes the nitrogen into the groundwater automatic monitoring sample protection device, thereby achieving "isolation" of the sample from the air, effectively preventing the groundwater sample from being affected by oxygen and carbon dioxide in the atmosphere, thereby protecting the water sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 This is a schematic diagram of the structure of a groundwater automatic monitoring sample protection device of the utility model;

[0011] Figure 2 The utility model is a water sample flow chart of a groundwater automatic monitoring sample protection device. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] 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 in conjunction with the accompanying drawings and specific implementation methods.

[0014] Please refer to Figure 1 As shown, the utility model is an automatic groundwater monitoring sample protection device, which comprises a sample water bucket 1, a sealing cover 2 is provided on the top of the sample water bucket, a sampling port 11 and an emptying port 12 are provided at the bottom of the sample water bucket for sampling and emptying, a high liquid level switch 3, a middle liquid level switch 5 and a low liquid level switch 6 are provided on the body of the sample water bucket 1 from top to bottom for setting the liquid level, a pressure relief port 7 is provided on the top of the body of the sample water bucket 1, a sample outlet 10 is provided at the bottom, an air wash / liquid wash port 8 is provided on the upper part of the body of the sample water bucket 1 for introducing nitrogen or clean water, a manual sampling port 9 is provided at the lower part of the body of the sample water bucket 1 for manual sampling, and the sample water bucket 1 is also connected to a liquid level transparent observation tube 4 for observing the liquid level from the outside.

[0015] The groundwater automatic monitoring sample protection device also includes a PSA (pressure swing adsorption) nitrogen generator (not shown in the figure) to produce high-purity nitrogen. The PSA principle is mainly based on the different adsorption rates of oxygen and nitrogen by carbon molecular sieves. Carbon molecular sieves preferentially adsorb oxygen, while nitrogen is mostly enriched and not adsorbed. Therefore, the difference in the amount of oxygen and nitrogen adsorbed by carbon molecular sieves in a certain period of time is used, combined with the rapid cycle process of pressurized adsorption and decompression desorption (pressure swing adsorption), to complete oxygen-nitrogen separation, thereby obtaining high-purity nitrogen in the gas phase.

[0016] When sampling using the groundwater automatic monitoring sample protection device, if Figure 2 As shown, the process is as follows:

[0017] Step 1: After the well washing is completed, the sample water bucket is emptied, and the injection valve S5, the sample preparation valve S12, and the pressure relief valve S11 are closed to close the injection port 11, the sample outlet 10, and the pressure relief port 7 to form a complete closed space inside;

[0018] Step 2: Open the drain valve S10 and the air / liquid wash valve S9 to open the drain port 12 and the air / liquid wash port 8, turn on the air compressor to prepare the sample with high-purity nitrogen, and use high-purity nitrogen to discharge the water sample in the enclosed space into the sample bucket through the air / liquid wash port 8;

[0019] Step 3: After emptying the sample water bucket, continue to run the air compressor and nitrogen generator module, and continue to purge the sample water bucket for 3 minutes;

[0020] Step 4: Close the drain valve S10 and the air / liquid wash valve S9 to close the drain port 12 and the air / liquid wash port 8, open the injection valve S5 and the pressure relief valve S11 to open the injection port 11 and the pressure relief port 7, and collect the water sample;

[0021] Step 5: Open the sampling unit for sampling. When the water sample reaches the set liquid level (which can be low liquid level, middle liquid level, or high liquid level), close the injection valve S5 and the pressure relief valve S11 to close the injection port 11 and the pressure relief port 7;

[0022] Step 6: Open the sample preparation valve S12 and the air wash / liquid wash valve S9 to open the sample outlet 10 and the air wash / liquid wash outlet 8 to distribute the collected water sample to the instrument;

[0023] Step 7: After the distribution is completed, close the sample preparation valve S12, open the pressure relief valve S11, and the drain valve S10, fill the entire sample water bucket with clean water, and close the air wash / liquid wash valve S9 and the pressure relief valve S11.

[0024] The following table shows the comparison of dissolved oxygen and redox potential of water samples in the pipeline before and after adding nitrogen protection during the automatic monitoring of groundwater. After adding nitrogen protection, the dissolved oxygen of the water sample decreased, and the redox potential also decreased, proving that nitrogen protection can protect groundwater from the influence of oxygen in the air:

[0025] .

[0026] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only a specific implementation method of the groundwater automatic monitoring sample protection device. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A groundwater automatic monitoring sample protection device, characterized in that: The automatic groundwater monitoring sample protection device comprises a sample water bucket, a sealing cover is provided on the top of the sample water bucket, a sampling port and an emptying port are provided at the bottom of the sample water bucket for sampling and emptying, a high liquid level switch, a middle liquid level switch and a low liquid level switch are provided on the body of the sample water bucket from top to bottom in order for setting the liquid level, a pressure relief port is provided at the top of the body of the sample water bucket, a sample outlet is provided at the bottom, an air wash / liquid wash port is provided at the upper part of the body of the sample water bucket for introducing nitrogen or clean water, and a manual sampling port is provided at the lower part of the body of the sample water bucket for manual sampling.

2. The groundwater automatic monitoring sample protection device according to claim 1 is characterized in that: The sample water bucket is also connected to a liquid level transparent observation tube.

3. The groundwater automatic monitoring sample protection device according to claim 1 is characterized in that: The groundwater automatic monitoring sample protection device also includes a PSA (pressure swing adsorption) nitrogen generator for producing high-purity nitrogen.

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