Device for measuring dissolved oxygen in water sample

Abstract

The utility model discloses a device for measuring dissolved oxygen in a water sample, which comprises a metering cylinder, a first cock is arranged at the top end of the metering cylinder, the first cock is a three-way cock, a water outlet pipe and a color developing agent inlet pipe are fixedly arranged at the top end of the metering cylinder, an original medicine taking device is improved into a three-way structure, and the first cock is used for controlling the smoothness of each pipeline. The color developing agent adding port and the sample outlet are separated, a sample and a color developing agent are prevented from being mixed, deviation is avoided, a drainage cylinder is further arranged, a plurality of flow deflectors are installed in the drainage cylinder, when water flows through the drainage cylinder, the water flows form a vortex shape, and therefore the water flow is more uniform. Therefore, the water flow can better wash the inner wall, the cleaning of the cylinder wall is realized, and the deviation influence is avoided.

Description

Technical field:

[0001] The utility model relates to the field of chemical production and detection, in particular to a device for measuring dissolved oxygen in a water sample. Background technology:

[0002] In the process of chemical production, wastewater is inevitably generated. If the wastewater is to meet the discharge standards, the dissolved oxygen index is an essential data.

[0003] However, the sampling and adding of the color developer of the sampler of the existing dissolved oxygen field determination device all use one nozzle. During the sampling process, a small amount of water sample will adhere to the nozzle, and the oxygen in the air will dissolve in the attached water. When the color developer is added to the nozzle, it will react with the oxygen in the attached water sample, resulting in deviations in the analysis results.

[0004] Therefore, a dissolved oxygen measuring device capable of reducing the deviation is needed. Utility model content:

[0005] The utility model aims to provide a device for measuring dissolved oxygen in a water sample.

[0006] The utility model is implemented by the following technical solutions:

[0007] A device for measuring dissolved oxygen in a water sample comprises a metering cylinder, a first stopcock is installed at the top of the metering cylinder, the first stopcock is a three-way stopcock, a water outlet pipe and a developer inlet pipe are fixedly installed at the top of the metering cylinder, the first stopcock is installed at the common connection of the three, a water inlet pipe is fixedly installed at the bottom of the metering cylinder, and a second stopcock is installed on the water inlet pipe.

[0008] Preferably, the top end of the water inlet pipe is fixedly connected with a drainage cylinder, the top end of the drainage cylinder is fixedly connected and communicated with the bottom end of the metering cylinder, and a plurality of guide plates are spirally fixedly connected to the inner wall of the drainage cylinder.

[0009] The advantages of the utility model are as follows: the original medicine dispenser is improved into a three-way device, and the first stopcock is used to control the unobstructed flow of each pipeline, so that the detection result is obtained, the color developer addition port and the sample outlet are separated, and the mixing of the sample and the color developer is avoided, thereby avoiding deviation. A drainage tube is further provided, and a plurality of guide plates are installed in the drainage tube. When water flows through, the water flow will form a vortex, so that the water flow can better flush the inner wall, thereby achieving the cleaning of the tube wall and avoiding the influence of deviation. Description of the drawings:

[0010] Figure 1 It is a schematic diagram of the structure of the utility model.

[0011] Figure 2 It is a top view of the drainage tube in the utility model.

[0012] In the figure: metering cylinder 1, water outlet pipe 2, developer inlet pipe 3, water inlet pipe 4, first stopcock 5, second stopcock 6, drainage cylinder 7, guide plate 8. Specific implementation method:

[0013] like Figure 1 to Figure 2 As shown, a device for determining dissolved oxygen in a water sample comprises a metering cylinder 1, a first cock 5 is installed at the top of the metering cylinder 1, the first cock 5 is a three-way cock, a water outlet pipe 2 and a developer inlet pipe 3 are fixedly installed at the top of the metering cylinder 1, the first cock 5 is installed at the common connection of the three, a water inlet pipe 4 is fixedly installed at the bottom of the metering cylinder 1, a second cock 6 is installed on the water inlet pipe 4, the original medicine dispenser is improved into a three-way, so that the water outlet pipe 2 and the developer inlet pipe 3 are divided into two different pipes, so that the first cock 5 is used to control the smooth flow of each pipe, when the detection work is carried out normally, the second cock 6 is first opened, and at this time, the second cock 6 is rotated. A stopcock 5 is used to keep the water outlet pipe 2 and the metering cylinder 1 unobstructed, so that the waste water is used to flush the inside of the metering cylinder. The flushing is maintained for five minutes. Next, the second stopcock 6 is closed, so that the inside of the metering cylinder 1 is filled with waste water. Then the first stopcock 5 is rotated to keep the color developer inlet pipe 3 and the metering cylinder 1 unobstructed, and the color developer is added through the color developer inlet pipe 3. The capacity of the metering cylinder 1 is 100 ml, and the amount of color developer added is 1.8 ml. Then the first stopcock 5 is closed, and colorimetry is performed after uniform mixing. The test result is obtained in this way, so that the color developer addition port and the sample outlet are separated to avoid mixing of the sample and the color developer, thereby avoiding deviation.

[0014] The top of the water inlet pipe 4 is fixedly connected to a drainage tube 7, the top of the drainage tube 7 is fixedly connected and communicated with the bottom end of the metering tube 1, and a plurality of guide plates 8 are spirally fixedly connected to the inner wall of the drainage tube 7. A drainage tube 7 is further provided, and a plurality of guide plates 8 are installed in the drainage tube 7. When water flows through, it will form a vortex shape, so that the water flow can better flush the inner wall, thereby achieving the cleaning of the tube wall and avoiding the influence of deviation.

[0015] The above description is only a preferred embodiment of the present invention and is 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 protection scope of the present invention.

Claims

1. A device for measuring dissolved oxygen in a water sample, characterized in that: It includes a metering cylinder, a first stopcock is installed on the top of the metering cylinder, the first stopcock is a three-way stopcock, a water outlet pipe and a developer inlet pipe are fixedly installed on the top of the metering cylinder, the first stopcock is installed at the common connection of the three, a water inlet pipe is fixedly installed on the bottom of the metering cylinder, and a second stopcock is installed on the water inlet pipe.

2. A device for measuring dissolved oxygen in a water sample according to claim 1, characterized in that: The top end of the water inlet pipe is fixedly connected with a drainage cylinder, the top end of the drainage cylinder is fixedly connected and communicated with the bottom end of the metering cylinder, and a plurality of guide plates are spirally fixedly connected to the inner wall of the drainage cylinder.

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