JPS6315814Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a falling water transmitted light type turbidity meter.

FIG. 1 is a diagram showing an example of a conventional falling water transmitted light method turbidity meter, in which 1 is a measuring tank, 2 is a sample drop port, 3 is a light source, 4 is a light receiver, 5 is a sample receiving port, 6 is a sample discharge pipe, 7 is an adjustment tank, 8 is a sample inflow pipe, 9 is an inter-tank connecting pipe, 10 is an overflow outflow pipe, and 11 and 12 are flow rate adjustment valves. Adjustment tank 7 via 11
The sample flows into the measurement tank 1 via the inter-tank connecting pipe 9 and the flow rate adjustment valve 12, falls from the drop port 2 provided at the bottom of the tank, forms a sample water column, and then passes through the receiving port 5 and the sample discharge pipe 6. flows out through. In this turbidity meter, the sample flowing from the sample inflow pipe 8 is cleared of air in the adjustment tank 7, and when the flow rate of the sample inflow increases and a pressure change occurs, the sample flows from the overflow outflow pipe 10. Since the pressure fluctuation is absorbed by the overflow, the surface of the sample water column falling from the drop port 2 of the measurement tank 1 is not disturbed. Accurate turbidity measurement can be performed by receiving light.

However, in order to remove air in the sample in the adjustment tank 7, absorb pressure changes, and prevent disturbances on the surface of the sample water column falling from the drop port 2 of the measurement tank 1, it is necessary to Therefore, it is necessary to increase the volume of the adjustment tank 7 and the volume of the measurement tank 1 to some extent, so it is inevitable that the response speed during measurement will be slow. This method has no choice but to increase the inflow flow rate, which results in a large amount of sample consumption, making it unsuitable for measuring the turbidity of valuable samples. Furthermore, since the adjustment tank 7 is required in addition to the measurement tank 1, the number of piping, flow rate adjustment valves, etc. also increases, resulting in a disadvantage that the overall configuration becomes complicated and large.

The object of the present invention is to realize a turbidity meter that has a simple and compact configuration and can perform accurate measurements without causing any disturbance on the surface of a sample water column falling from a measurement tank.

FIG. 2 is a partially cross-sectional configuration diagram showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the main parts. In both figures, 1 is a measuring tank, 13 and 14 are cylinders,
For example, each is arranged approximately coaxially with the measurement tank 1,
The lower end edge and upper end edge of the outer cylindrical body 13 are provided so as to be appropriately higher than the lower end edge and the upper end edge of the inner cylindrical body 14, respectively. There is no problem in turbidity measurement even if the lower edge of the inner cylindrical body 14 is brought into close contact with the bottom wall of the measurement tank 1, but when replacing the sample in the measurement tank 1 with another sample, etc., the side wall of the measurement tank 1 and inner cylinder 1
4. In order to facilitate the discharge of the old sample and fine solid matter mixed in this sample, an appropriate narrow gap is provided between the lower edge of the inner cylinder 14 and the bottom wall of the measuring tank 1. It may also be provided. 1
Reference numeral 5 denotes supports, which are made of, for example, a thin plate or a thin rod, and are provided in an appropriate number, for example, radially between the inner wall of the measurement tank 1 and the cylinders 13 and 14, so that the cylinders 13 and 14 can be provided without interfering with the inflow and outflow of the sample. 14 in the positional relationship described above. Instead of providing the support 15, the lower edges of the cylinders 13 and 14 are fixed to the bottom wall of the measuring tank 1, and a plurality of relatively high cuts are made around the lower end of the outer cylinder 13. In addition, a plurality of relatively low-height notches may be provided around the lower end of the inner cylindrical body 14 in the axial direction of the cylinder. Reference numeral 2 denotes a sample drop port, which is provided on the bottom wall of the measurement tank 1, substantially coinciding with the central axis of the inner cylindrical body 14. 3 is a light source, 4 is a light receiver, 5 is a sample receiving port, 6 is a sample discharge pipe, 8 is a sample inflow pipe,
11 is a flow rate adjustment valve, and 16 is an overflow outflow pipe, the upper end of which corresponds to the height between the upper edge of the outer cylinder 13 and the upper edge of the inner cylinder 14 in the side wall of the measurement tank 1. The lower end is connected to the sample discharge tube 6.

The sample that has flowed into the measurement tank 1 through the sample inflow pipe 8 and the flow rate adjustment valve 11 flows between the side wall of the measurement tank 1 and the outer cylinder 13, as shown by the arrow in FIG. 13 and the inner cylindrical body 14 and inside the inner cylindrical body 14 and changes its direction up and down and falls from the drop port 2, so it flows downward between the side wall of the measuring tank 1 and the outer cylindrical body 13. During this period, most of the air contained in the sample rises and is removed, and the height of the liquid level in the measurement tank 1 is lowered by the overflow outflow pipe 16.
Since the height at which the upper end is attached is maintained between the upper edge of the outer cylinder 13 and the upper edge of the inner cylinder 14, the sample can climb over the upper edge of the outer cylinder 13 and reach the outer cylinder. If the inflow flow rate of the sample further increases and a pressure change occurs without flowing into the body 13, the sample between the side wall of the measurement tank 1 and the outer cylindrical body 13 flows out from the overflow outflow pipe 16. The amount increases to absorb pressure changes, but in this case, there is no overflow from the liquid surface of the sample inside the outer cylinder 13 directly into the outflow pipe 16.
The height of the liquid level of the sample inside the outer cylindrical body 13 is always kept constant and there is no turbulence in the liquid level, thus causing turbulence in the surface of the sample water column falling from the drop port 2. Furthermore, since there is no possibility that this sample water column contains air bubbles, turbidity measurement can be performed accurately by receiving the light transmitted through the sample water column with the light receiver 4.

Although FIG. 3 shows an example in which the measuring tank 1 and the cylinders 13 and 14 have circular cross-sectional shapes, the present invention can be practiced even if they are formed in any cross-sectional shape, for example, rectangular.

According to the inventor's prototype example, measuring tank 1, cylinder 1
3 and 14 are circular in cross section, the inner diameter of the measuring tank 1 is 200 mm, the height of the side wall is 80 to 100 mm,
The diameter of the outer cylinder 13 is 120 mm, and the inner cylinder 14 is
By selecting the diameter of 60 mm and the inner diameter of the sample drop port 2 between 6 and 8 mm, it is possible to keep the outer diameter of the water column of the sample falling from the drop port 2 constant and to make the surface extremely smooth. We were able to obtain the same response speed as the conventional device with an inflow flow rate that was approximately 1/3 of the inflow flow rate of the sample in the conventional device shown in the figure.

As is clear from the above explanation, the proposed turbidity meter has fewer liquid tanks and piping than conventional turbidity meters, and the measurement tank has a small volume, so the overall configuration is simple and compact. Moreover, even when the inflow flow rate of the sample is small, the response speed during measurement is fast, so it is suitable for measuring the turbidity of valuable samples, and its effects are enormous.

[Brief explanation of the drawing]

Figure 1 shows an example of a conventional turbidity meter, and Figure 2 shows an example of a conventional turbidity meter.
Figures 3 and 3 are diagrams showing an embodiment of the present invention,
1...Measurement tank, 2...Sample drop port, 3...Light source,
4... Light receiver, 5... Sample receiving port, 6... Sample discharge pipe, 7... Adjustment tank, 8... Sample inflow pipe, 9...
Inter-tank connecting pipe, 10 and 16...outflow pipe for overflow, 11 and 12...flow rate adjustment valve, 13 and 14...cylinder body, 15...support body.

Claims (1)

[Scope of utility model registration request] An inner cylindrical body provided in the measuring tank is interposed between the side wall of the measuring tank and the inner cylindrical body, with the lower end edge and upper end edge being respectively kept above the lower end edge and upper end edge of the inner cylindrical body. a sample inflow pipe attached to the side wall of the measurement tank; a sample drop port provided in the bottom wall of the measurement tank at a location substantially corresponding to the central axis of the inner cylinder; An overflow outflow pipe is installed in the side wall of the measurement tank at a location corresponding to the height between the upper edge of the outer cylinder and the upper edge of the inner cylinder, and the sample water column falls from the sample drop port. A turbidity meter characterized by comprising a light source and a light receiver facing each other via a light source and a light receiver.