JPH0348530Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a flow-through type liquid analyzer.

<Prior art> In this type of device, when liquid is continuously introduced into the detection section, the liquid may be disturbed internally, or
In the case of mixed liquids, there are many problems in measurement due to the progression of changes in the components and the influence of the preceding liquid. Air bubbles are interposed between the liquid.

However, the bubble intervening mechanism described above connects the ends of the soft liquid introduction tube and the soft atmosphere introduction tube to the collecting pipe, and presses each soft tube with a roller to alternately introduce liquid and air bubbles into the collecting pipe. Because it is designed to do so, it has the following drawbacks.

Since the structure of the bubble intervening mechanism includes a pressure roller and a roller drive device, it is very large-scale and occupies a large space.

Even if it becomes necessary to add liquid introduction tubes to introduce many types of liquids, it is difficult to add more liquid introduction tubes. This is because it is necessary not only to connect the tube to be added to the collecting pipe, but also to modify the roller that presses against the tube and its drive mechanism.

The life of the bubble intervening mechanism is determined by the service life of the tube, but since the tube is pressed and deformed by the rollers, the service life is very short.

The tube into which the liquid, particularly the test liquid, is introduced needs to be cleaned from time to time to prevent clogging due to dirt, but cleaning requires interrupting the analysis operation, resulting in a large loss of time.

<Purpose of the invention> The present invention provides a novel means that can eliminate such drawbacks.

<Structure of the invention> Therefore, the flow-through liquid analyzer according to the invention includes a bubble intervening mechanism, a pump that introduces liquid to the detection part, and a liquid introduction pipe connected to one or more of the inlet parts, The remaining inlet section is provided with an air or inert gas inlet port, and the outlet section, which is selectively connected to these inlet sections, is composed of a rotary type switching valve to which the starting end of the liquid flow path to the detection section is connected. The gist is that.

<Example> Next, an example of the present invention will be described based on the drawings.
In FIG. 1, 1 is a detection unit for detecting liquid, for example.
An electrode section for measuring K ⁺ , Ca ⁺⁺ concentration, PH, etc., 2 is a pump for introducing liquid into the detection section 1, such as a tube pump, and 3 is a rotary type switching valve.
This switching valve 3 and the pump constitute a bubble intervening mechanism. Inlet portions a to g of the switching valve 3
Liquid inlet pipes 4, 5, and 6 are connected to parts c, e, and g, and the remaining inlets a, b, d, and f are opened to the atmosphere and serve as air inlet ports. However, an inert gas other than air can also be used. It is desirable that the liquid introduction pipes 4, 5, and 6 and the air or inert gas introduction ports (hereinafter abbreviated as air introduction ports) be alternately connected to the inlet portions a to g as shown in the illustrated example. This is because air bubbles can be interposed between the liquids by rotating the switching valve 3 forward and backward by one notch. In addition, in the illustrated example, the liquid introduction pipes 4, 5,
Of these, 4 is used as a sample probe for introducing the test liquid S, 5 is used as an introduction tube for zero calibration liquid A, and 6 is used as an introduction tube for span calibration liquid B. On the other hand, the starting end of the liquid flow path 7 to the detection section 1 is connected to the outlet section h of the rotary type switching valve 3 . In the illustrated example, there is one more outlet, and a bypass line 8 is connected to this outlet i. Each of the outlet sections h and i is selectively connected to each of the inlet sections a to g by rotating the rotary type switching valve 3. The switching valve 3 can be rotated manually or automatically. In the illustrated example, the latter is adopted, and a liquid detection sensor 9 such as a conductivity meter is provided upstream of the detection unit 1, and the switching valve 3 is switched in response to a signal from this sensor 9 that detects liquid. . In addition to controlling the switching valve 3, the liquid detection sensor 9 also controls the timing of the detection operation of the detection section 1. That is, the electrode signal is extracted after confirming that there are no bubbles in the flow path 7 in the detection section 1 based on the signal from the liquid detection sensor 9. In the figure, 10 is a cleaning solution, and 11 is a reference electrode internal solution such as Kc. This internal liquid 11 is passed through a tube pump 2 to a pipe 1.
2 to the detection unit 1.

In the above configuration, when the tube pump 2 is operated to apply suction force to the liquid flow path 7 and the rotary type switching valve 3 is rotated in the forward and reverse directions,
Due to the suction force of the pump and the selective connection of the outlet section h of the switching valve 3 to the inlet sections a to g, liquid and bubbles are alternately introduced into the liquid flow path 7. . That is, like the conventional bubble intervening mechanism, it is possible to interpose air bubbles between liquids.

In this case, bubbles can of course be interposed between different types of liquids, but as shown in Figure 2, when introducing the test liquid S after the calibration liquid A, It is also possible to divide the test liquid into S ₁ , S ₂ , S ₃ , etc. by interposing a plurality of air bubbles in the portion. Such division can be performed by rotating the rotary switching valve 3 forward and backward several times between the inlet portions c and d. In this way, when the front part of the test liquid S is divided by the bubbles, the calibration liquid A, which is the front liquid, flows into the flow path 7.
Even if it adheres to the inside, it is washed by the divided test liquid S ₁ that advances after that, and further cleaned even more cleanly by the subsequent test liquids S ₂ and S ₃ . The test liquid that advances last can be measured in the detection section 1 without being affected by the preceding liquid at all.

Also, when introducing the calibration solution A after the test solution S, if the pre-stage part of the calibration solution is divided by air bubbles A ₁ , A ₂ , etc. as shown in Fig. 3, the test solution as the pre-solution can be Calibration can be done without being affected. Also, during this calibration, the outlet part i of the switching valve 3 is connected to the inlet part c, so the cleaning liquid 10 is connected to the sample probe 4.
If this is introduced, the sample probe can be cleaned by flowing a cleaning liquid through the sample probe 4 and the bypass line 8 while the detection section 1 is being calibrated.

In the embodiment, the pump 2 is provided behind the detection section 1, but it may be provided before the detection section 1.

<Effects of the invention> Since the flow-through liquid analyzer according to the invention is constructed as described above, it has the following effects.

The bubble intervening mechanism can be composed of two points, a pump and a rotary type switching valve, and the rotary type switching valve can be constructed much more compactly than a conventional bubble intervening mechanism consisting of a pressure roller and a roller drive device.

Since the rotary switching valve has a large number of inlets, when it is desired to introduce a large number of liquids (for example, calibration liquid), it can be handled simply by increasing the number of liquid introduction pipes.

In addition, since it is equipped with multiple outlet sections, a bypass line is connected to the outlet section other than the outlet section connected to the flow path leading to the detection section as explained in the example, and the bypass line is connected to the outlet section while the detection section is being calibrated. If the test solution introduction tube (sample probe) is connected to the bypass line, the test solution introduction tube can be cleaned during the calibration period by soaking it in cleaning solution. , it is possible to eliminate dead time.

Air bubbles can be interposed between the liquid by the suction force of the pump and the rotation of the rotary type switching valve, and there is no need to use a soft tube as in the past, so the service life is significantly extended.

By rotating the rotary type switching valve in the forward and reverse directions between the inlet where the liquid inlet pipe is connected and the inlet where the air inlet is installed, the front stage of the liquid can be divided into multiple parts by air bubbles. Since the inside of the flow path can be cleaned with liquid, the liquid replacement is much faster than methods that do not use bubbles to divide the flow path.
Measurements can be performed without being affected by the preliquid without additional cleaning.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is an overall piping configuration diagram, Figure 2 is a diagram showing the front part of the test liquid divided into multiple parts by air bubbles, and Figure 3 is a sample probe. FIG. DESCRIPTION OF SYMBOLS 1...Detection part, 2...Pump, 3...Rotary type switching valve, a-g...Inlet part, h...Outlet part.

Claims (1)

[Scope of utility model registration request] In a flow-through liquid analyzer in which a bubble is interposed between a liquid flowing through a flow path using a bubble intervening mechanism and the liquid is introduced directly into a detection section for analysis, the bubble interposition mechanism is inserted into the detection section. A liquid introducing pipe is connected to one or more of the inlets of the pump that introduces the liquid, an air or inert gas inlet is provided in the remaining inlets, and an outlet port that is selectively connected to these inlets is provided. 1. A flow-through liquid analyzer comprising a rotary switching valve connected to the starting end of a liquid flow path to a detection section.