JPS6315811Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a surface scattering type turbidity meter.

Figure 1 is a diagram showing an example of a conventional surface scattering type turbidity meter, in which 1 is a measurement tank, 2 is a light source, 3 is a light receiver, 4 is an adjustment tank, 5 is a sample inflow pipe, and 6 is a tank gap. The connecting pipe, 7 is an overflow outflow pipe, 8 is a sample discharge pipe, and 9 and 10 are flow rate adjustment valves. Connecting pipe 6 and flow rate adjustment valve 10
The sample flows into the measurement tank 1 through the sample tank 1, overflows from the upper edge of the side wall of the measurement tank 1, and flows out from the sample discharge pipe 8. In this turbidity meter, the sample flowing from the sample inflow pipe 5 is cleared of air in the adjustment tank 4.
In addition, when the inflow flow rate of the sample increases and pressure changes occur, the sample overflows from the overflow outflow pipe 7 and the pressure fluctuation is absorbed, so that the overflow surface in the measurement tank 1 is not disturbed. Then, by projecting the light from the light source 2 onto the overflow surface and receiving the scattered light from the sample with the light receiver 3, accurate turbidity measurement can be performed.

However, in order to remove air in the sample in the adjustment tank 4, absorb pressure changes, and prevent disturbances on the overflow surface in the measurement tank 1, the volume of the adjustment tank 4 should be larger than that of the measurement tank 1. At the same time, it is necessary to increase the volume of the measurement tank 1 to some extent, so it is inevitable that the response speed during measurement will be slow, and the only way to increase the response speed is to increase the flow rate of the sample inflow. Therefore, the amount of sample consumed is large, making it unsuitable for measuring the turbidity of valuable samples. In addition, as the adjustment tank 4 is required in addition to the measurement tank 1, the number of piping and flow rate adjustment valves also increases, and the insertion end of the inter-tank connecting pipe 6 into the measurement tank 1 is directed downward. Since it is necessary to bend the measuring tank 1 so that the overflow surface of the measuring tank 1 is not disturbed by the inflow pressure of the sample into the measuring tank 1, the entire structure 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 disturbance on the overflow surface of the sample.

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, 11 and 12 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 11 are provided so as to be appropriately higher than the lower end edge and the upper end edge of the inner cylindrical body 12, respectively. There is no problem in turbidity measurement even if the lower edge of the inner cylinder 12 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
2. 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 cylindrical body 12 and the bottom wall of the measuring tank 1. It may also be provided. 1
Reference numeral 3 denotes, for example, thin plate-shaped or thin rod-shaped supports, and an appropriate number of them are provided, for example, radially between the inner wall of the measurement tank 1 and the cylinders 11 and 12, so that the cylinders 11 and 12 can be connected to the cylinders 11 and 12 without interfering with the inflow and outflow of the sample. It is formed so as to be supported in the positional relationship of. Instead of providing the support 13, the lower edges of the cylinders 11 and 12 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 11. In addition, a plurality of relatively low-height cuts may be provided around the lower end of the inner cylinder 12 in the cylinder axis direction. 2 is a light source, 3 is a light receiver, 5 is a sample inflow pipe, 9 is a flow rate adjustment valve, and 14 is a sample discharge pipe, which are attached to approximately the center of the bottom wall of the measurement tank 1. 15 is an overflow outflow pipe, whose upper end is connected to measurement tank 1.
It is attached to the side wall of the tube at a location corresponding to the height between the upper edge of the outer cylindrical body 11 and the upper edge of the inner cylindrical body 12, and its lower end is connected to the sample discharge tube 14.

The sample that has flowed into the measurement tank 1 through the sample inflow pipe 5 and the flow rate adjustment valve 9 flows between the side wall of the measurement tank 1 and the outer cylindrical body 11, as shown by the arrow in FIG.
The flow changes direction up and down between the outer cylinder 11 and the inner cylinder 12 and inside the inner cylinder 12, and flows out from the sample discharge pipe 14, so that the side wall of the measurement tank 1 and the outer cylinder 11 Most of the air contained in the sample rises and is removed while flowing downward between the chambers, and the height of the liquid level in the measuring tank 1 is the height at which the upper end of the overflow outflow pipe 15 is attached, that is, the outer side. cylinder body 11
Since the sample is maintained between the upper edge of the inner cylinder 12 and the upper edge of the inner cylinder 12, the sample does not flow over the upper edge of the outer cylinder 11 into the outer cylinder 11, and the inflow flow rate of the sample is further reduced. When the pressure changes due to an increase in the pressure, the amount of sample between the side wall of the measurement tank 1 and the outer cylinder 11 flowing out from the overflow pipe 15 increases and absorbs the pressure change. ,
Since the liquid level of the sample inside the outer cylinder 11 does not directly overflow into the outflow pipe 15, the liquid level of the sample inside the outer cylinder 11 is not disturbed, and therefore this liquid level By projecting the light from the light source 2 onto the surface and letting the scattered light enter the light receiver 3, turbidity measurement can be performed accurately.

Although FIG. 3 shows an example in which the measurement tank 1 and the cylinders 11 and 12 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
1 and 12 are circular in cross section, the inner diameter of measurement tank 1 is 200 mm, the height of the side wall is 80 to 100 mm,
The diameter of the outer cylinder 11 is 120 mm, and the inner cylinder 12 is
By selecting the diameter of 60 mm, the liquid level inside the outer cylinder 11 can be made extremely smooth, and the inflow flow rate of the sample is approximately 1/3 of that in the conventional apparatus shown in Fig. 1. We were able to obtain the same response speed as the conventional device.

When using a measurement tank configured to allow the sample to overflow from the upper edge of the side wall, a cylindrical body 1 is placed inside the measurement tank 1, as shown in a sectional view of the main part in FIG.
6, and its upper edge is positioned appropriately higher than the upper edge of the side wall of the measuring tank 1, and a sample inflow pipe is installed on the bottom wall of the measuring tank 1 corresponding to between the side wall of the measuring tank 1 and the cylindrical body 16. If you configure it so that 5 is installed,
Most of the air in the inflowing sample does not enter the inside of the cylinder 16 and rises between the side wall of the measurement tank 1 and the cylinder 16 and is released into the atmosphere, and the pressure fluctuation due to the increase in the flow rate of the sample Although it is absorbed by the overflow from the upper edge of the side wall of the measurement tank 1, the turbulence of the liquid level due to the overflow of the sample is blocked by the cylinder 16, so it is possible to keep the liquid level inside the cylinder 16 smooth. . In FIG. 4, 17 is a receiving groove for overflow liquid, and 18 is a sample discharge tube.

As is clear from the above explanation, the proposed turbidity meter has fewer liquid tanks and piping than conventional turbidity meters, and the end of the sample inflow tube is inserted into the measurement tank and bent downward. There is no need for any processing such as tightening, and only a small measuring tank is required, so the overall structure is simple and compact, and the response speed during measurement is fast even when the inflow flow rate of the sample is small. It is suitable for measuring the turbidity of precious 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.
4 to 4 are diagrams showing an embodiment of the present invention, 1...Measurement tank, 2...Light source, 3...Light receiver, 4
...Adjustment tank, 5...Sample inflow pipe, 6...Inter-tank connection pipe, 7 and 15...Overflow outflow pipe,
8, 14 and 18...sample discharge tube, 9 and 10...
...Flow rate adjustment valve, 11, 12 and 16... Cylindrical body, 1
3...Support, 17...Receiving groove for overflow liquid.

Claims (1)

[Scope of utility model registration request] An inner cylindrical body provided in the measurement tank is interposed between the side wall of the measurement tank and the inner cylindrical body, with the lower end edge and the upper end edge being respectively kept above the lower end edge and the upper end edge of the inner cylindrical body. a sample inlet pipe attached to the side wall of the measurement tank; a sample discharge pipe attached to 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 a A turbidity meter comprising a light source that projects light and a receiver that receives scattered light from a sample.