JPS6234288Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a flow cell used for optical analysis.

Optical analysis is a method of quantitative analysis by measuring the degree of light absorption by a sample. In this optical analysis, a flow cell is used to perform analysis while continuously flowing the sample through the measurement section, or intermittently. It is used when performing analysis after flowing and stopping the flow.

An example of a conventionally used flow cell is shown in FIG.

The flow cell is composed of a main body 11 having a cell part 13 that accommodates a sample and a liquid guide path 14 communicating with the cell part, and a pair of transparent plates 12 that close both ends of the cell part 13. . By connecting piping to the sample inlet 15 provided below the cell section 13, the liquid guide path 14 is connected to the cell section 13.
3. Inhale the sample. While the sample is flowing through the cell section 13 or when the flow of the sample is stopped, the arrow 21
A predetermined analysis is completed by the measurement light irradiated from the direction, and the sample is discharged from the sample discharge port 16 to which piping is connected through the liquid guide path 14. In the conventional flow cell, the connecting portion between the sample inlet 15 (or sample outlet 16, hereinafter simply referred to as "sample inlet 15") and the piping 18 is connected to the sample inlet 15 as shown in FIG. The tips of the pipes 18 are brought into contact with each other, or the pipes 18 are placed over the cylindrical portion of the sample suction port 15, and their outer surfaces are covered with a soft tube 19 such as a silicon tube or a heat-shrinkable tube. However, with this connection method,
As shown in Figure 6a, the sample inlet 15 and piping 18
A liquid pool 22 may occur in the gap between the tip and the tip of the sample suction port 15, or a liquid pool 22 may occur near the tip of the sample suction port 15, as shown in FIG. Furthermore, since the connection method described above is used, it takes time and effort to connect.

This invention was made with the aim of solving the above-mentioned problems with conventional flow cells, and providing a flow cell that is easy to connect to piping and does not cause sample liquid accumulation.

The configuration of this idea will be explained.

An example of the flow cell according to this invention is the first
As shown in the figure, a feature is that a female thread 17 is provided at a location where the liquid guide path 14 and the piping are connected. In this case, the root diameter of the female thread 17 is approximately the same as the outer diameter of the pipe to be used. For example, when using a Teflon tube with an inner diameter of 1 mm and an outer diameter of 2 mm, the inner diameter of the sample inlet 15 should be 2 mm, the inner diameter of the liquid guide path should be 1 mm, and an M2 female thread should be provided. The reason why the inner diameter of the liquid guide path is set to 1 mm is to ensure a smooth flow of the sample from the piping to the liquid guide path. In Fig. 2, the pipe 18 is connected to the female thread 17 of the flow cell.
An enlarged view of the connection. Of these, point a is the state immediately before the pipe 18 is connected, and the pipe 18 is screwed into the female thread 17 while rotating clockwise. Then, as shown in b, the rotation is stopped when the tip of the pipe 18 hits the bottom of the screw. Here, both surfaces are finished smooth so that the tip of the pipe 18 and the bottom of the screw are sufficiently shielded. Also, piping 1
If a sealing material such as Teflon tape is used between the outer surface of 8 and the female thread 17, the shielding will be more reliable. Note that if ceramics is used as the material for the main body portion 11, the above-described molding is easy. Flow cells according to other embodiments of this invention are shown in FIGS. 3 and 4.

By configuring the flow cell as in this invention, the connection between the liquid guide path of the flow cell and the piping is ensured, and furthermore, no liquid pools occur at the connection portion, and carryover is reduced. Furthermore, since the number of parts related to the flow cell is small, manufacturing costs are also reduced.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view of the flow cell according to the present invention, FIG. 2 is an enlarged cross-sectional view showing the connecting portion between the liquid guide path and the piping, and FIGS. 3 and 4 are different views of the flow cell according to the present invention. FIG. 5 is a front sectional view showing an example of the embodiment, FIG. 5 is a front view showing an example of a conventional flow cell, and FIG. 6 is a sectional view showing a connecting portion between a sample inlet and piping. 11...Main body part, 12...Transparent plate, 13...Cell part, 14...Liquid guide path, 15...Sample inlet, 1
6...Sample discharge port, 17...Female thread, 18...Piping.

Claims (1)

[Scope of utility model registration request] It consists of a main body part having a cell part for accommodating a sample and a liquid guide path for the sample communicating with the cell part, and a transparent plate joined to the main part part at both ends of the cell part, and a sample provided below the cell. In a flow cell configured to suck in and discharge a sample by connecting piping to the suction port and discharge port, respectively, the piping is connected so that its inner diameter is equal to the inner diameter of the liquid guiding path and its outer diameter is the same as the suction port and the discharge port. A flow cell comprising plastic piping having an inner diameter equal to the inner diameter of the outlet, and having a female thread for directly screwing the piping into the connecting portion between the liquid guiding path and the piping.