JPH07919Y2 - Fluid containing cell - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fluid storage cell such as a reaction cell or a mixing cell of an analyzer in which samples, reagents and the like are stored.

2. Description of the Related Art Conventional techniques, for example, in a continuous analyzer using an absorptiometry method, a sample and a reagent are supplied into a reaction cell, mixed and color-reacted, and then the measured substance is sent to a measuring device to perform a predetermined measurement. Is performed. An example of such a continuous analyzer is shown in FIG.

As shown in the figure, the continuous analyzer has a cylindrical peripheral wall portion 2a.
And an upper wall portion 2b and a bottom wall portion formed integrally with the peripheral wall portion 2a
A reaction cell 1 having a housing 2 composed of 2c and a fluid storage chamber 4 having a cylindrical shape is defined therein.
If necessary, a plurality of sample supply pipes 6 and reagent supply pipes 8 are provided penetrating the upper wall portion 2b of the reaction cell 1, and the sample supply pipes 6 and the reagent supply pipes 8 are provided with sample pumps, respectively. P1 and reagent pump P2 are connected.

With the above configuration, a predetermined amount of sample is supplied to the internal fluid storage chamber 4 of the reaction cell 1 by driving the sample pump P1 at a constant cycle. A drainage pipe 10 is provided so as to penetrate the peripheral wall portion 2a of the reaction cell 1, and when the amount of the sample supplied to the fluid storage chamber 4 exceeds a certain amount, it is drained to the outside through the drainage pipe 10. Therefore, a fixed amount of sample is always stored in the reaction cell 1. On the other hand, a certain amount of the coloring reagent is injected into the reaction cell 1 by the sample pump P2.

The fluid in the reaction cell 1 is uniformly mixed by the stirring blade 12 driven by the motor M or air aeration stirring, and the target component is colored. The fluid in which the reaction has been carried out, that is, the object to be measured, is the discharge pipe line 14 and the adjusting flight 16 provided in the bottom wall 2c
Then, the sample is guided to a measuring device, for example, an optical cell, through which predetermined analysis and measurement are performed.

FIG. 4 shows an example of the measurement result when a sample (silica in boiler water) is continuously measured using the analyzer having such a configuration. As can be seen from the measurement results, particularly the samples a, b, c and the like show extremely peculiar measured values.

The present inventors pursued the cause of why such a peculiar measurement value, that is, a large measurement error is shown. As a result, in the continuous analyzer using the absorptiometric method as shown in this example, in the reaction cell for carrying out the color reaction of the sample, the stirring was carried out by the stirring blade 12 housed in the reaction cell 1 or the aeration stirring with air. A part of the fluid to be dispersed scatters and adheres to the inner surface 2d of the upper wall 2b of the reaction cell 1 and the inner surface 2e of the peripheral wall 2a, and occasionally the droplets adhered to the wall surface flow down into the reaction cell 1, or It has been found that the cause is that it falls and contaminates the object to be measured in the reaction cell 1.

In particular, when a masking agent is used to mask an interfering substance (phosphoric acid) like a silica measuring device, a large measurement error may occur if the previous sample or color-developing reagent is mixed in before the masking agent is injected. I understood.

Such a problem occurs not only in the reaction cell of the continuous analysis device but also in a fluid storage cell containing a fluid such as a reaction cell or a mixing cell used in other measuring devices, etc. there were.

Therefore, the object of the present invention is to prevent the fluid attached to the wall surface in the cell from flowing down or falling along the wall surface and contaminating the object to be measured newly stored in the cell, Therefore, it is an object of the present invention to provide a fluid storage cell that enables highly accurate measurement without contamination measurement error.

Means for Solving the Problems The above object is achieved by the fluid storage cell according to the present invention.
In summary, the present invention comprises an outer housing having a peripheral wall portion and a top wall portion and a bottom wall portion integrally formed with the peripheral wall portion, and providing an inner peripheral wall portion protruding from the bottom wall portion,
A fluid storage chamber for storing a fluid is formed inside the inner peripheral wall portion, a groove portion having a predetermined depth is formed around the inner peripheral wall portion, and the inner surface of the upper wall portion is inclined. The fluid storage cell is characterized by being formed.

Embodiment Next, the fluid storage cell according to the present invention will be described in more detail with reference to the drawings.

In this embodiment, the fluid storage cell 20 is used as a reaction cell of a continuous analyzer using the absorptiometry method or the like.

In FIG. 1, the reaction cell 20 has an outer housing 22 having, for example, a cylindrical peripheral wall portion 22a, and an upper wall portion 22b and a bottom wall portion 22c integrally formed with the peripheral wall portion 22a. .

According to the present invention, the inner peripheral wall portion 24 is formed, for example, in a cylindrical shape, protruding from the bottom wall portion 22c. The inner peripheral wall portion 24 defines therein a fluid storage chamber 26 for storing a fluid, in this embodiment, a sample and a reagent. Therefore, the fluid storage chamber,
That is, the groove portion 28 having a predetermined depth is formed between the inner peripheral wall portion 24 and the cylindrical peripheral wall portion 22a.

Further, according to the present invention, the inner surface 22d of the upper wall 22b of the reaction cell 20 is
Is formed to be inclined and has a conical shape in this embodiment.
The inclination angle of the inner surface 22d of the upper wall, that is, the cone apex angle α in this embodiment.
Is not limited to an angle such that the fluid attached to the inner wall surface 22d can flow down along the wall surface, but is preferably about 90 °, for example.

A sample supply pipe 30 and a reagent supply pipe 32 are provided so as to penetrate the upper wall portion 22b of the reaction cell 20.
A sample pump P1 and a reagent pump P2 connected to the reagent supply pipe 32 and the reagent supply pipe 32 respectively supply the sample and the reagent into the fluid storage chamber 26.

With the above configuration, the internal fluid storage chamber 26 of the reaction cell 20 is supplied with a predetermined amount of the sample by driving the sample pump P1 in a constant cycle, and the coloring reagent is injected with a constant amount by the reagent pump P2. It The sample or the like overflowing from the fluid storage chamber 26 flows down into the groove 28, and is discharged to the outside through a drainage pipe 34 formed in the bottom wall portion 22c in communication with the groove 28.

The fluid in the fluid storage chamber 26 is uniformly mixed by the stirring blade 36 driven by the motor M or air aeration stirring,
The target component is colored. The reacted fluid, that is, the object to be measured is introduced into a measuring device, for example, an optical cell, via a discharge conduit 38 and a controlled stool 40 which are connected to the fluid storage chamber 26 and are provided in the bottom wall portion 22c. Then, predetermined analysis and measurement are performed.

Further, according to the present invention, the droplets that are agitated and scattered by the agitating blade 36 or the air agitation and adhered to the inner wall 22d and the inner wall 22e of the upper wall of the reaction cell are attached to the inner wall 22d and the inner wall 22e of the upper wall. It flows down along it, flows into the groove 28 formed around the fluid storage chamber 26, and is discharged to the outside through the discharge pipe line 34. Therefore, the liquid droplets adhering to the inner surface 22d of the upper wall and the inner surface 22e of the peripheral wall do not flow down or fall into the fluid storage chamber 26 and contaminate the object to be measured in the fluid storage chamber 26.

Droplets adhering to the upper wall inner surface 22d and the peripheral wall inner surface 22e of the reaction cell, in order to more easily flow down along the upper wall inner surface 22d and the peripheral wall inner surface 22e, the reaction cell 20 easily flowable material, for example vinyl chloride resin. It is preferable to use a synthetic resin that has good chemical resistance, such as, and is preferably transparent. In addition, it is preferable to coat the inner surface 22d of the upper wall of the reaction cell with, for example, a fluororesin, if necessary.

Further, in the above embodiment, the sample supply pipe 30 and the reagent supply pipe 32 are formed so as to penetrate the upper wall portion 22b of the reaction cell. However, as shown in FIG. Depending on, depending on the horizontal wall 22a of the reaction cell,
Alternatively, it may be arranged at a slight inclination.

FIG. 2 shows the result of measurement using a standard solution of 35 ppb (containing 10 ppm of phosphate ion) in a continuous silica measuring apparatus using the fluid storage cell configured as described above.

As described above, when a masking agent is used to mask an interfering substance (phosphoric acid) like a silica measuring device, a large measurement error may occur if the previous sample or color reagent is mixed before the masking agent is injected. Although it occurs, as shown in the graph of FIG. 2, it can be understood that the use of the reaction cell of the present invention enables extremely highly accurate measurement with very little contamination measurement error. Ah

As described above, in the fluid storage cell according to the present invention, the groove having a predetermined depth is formed around the fluid storage chamber, and the inner surface of the upper wall is formed to be inclined. The fluid adhered to the wall surface in the cell does not contaminate the object to be measured newly stored in the cell by flowing down or falling along the wall surface, and therefore high accuracy without contamination measurement error It has the feature of being able to measure.

[Brief description of drawings]

FIG. 1 is a sectional view of a fluid storage cell according to the present invention. FIG. 2 is a graph showing the measurement results by the silica measuring device using the fluid storage cell according to the present invention. FIG. 3 is a sectional view of a conventional fluid storage cell. FIG. 4 is a graph showing a measurement result by a silica measuring device using a conventional fluid containing cell. 22: Outer housing 22a: Peripheral wall 22b: Top wall 22c: Bottom wall 24: Inner peripheral wall 26: Fluid container 28: Groove

Claims (1)

[Scope of utility model registration request] 1. An outer housing having a peripheral wall portion and an upper wall portion and a bottom wall portion integrally formed with the peripheral wall portion, and an inner peripheral wall portion projecting from the bottom wall portion, wherein the inner side wall is provided. A fluid storage chamber for storing a fluid is formed inside the peripheral wall portion, a groove portion having a predetermined depth is formed around the inner peripheral wall portion, and the inner surface of the upper wall portion is formed to be inclined. A fluid containing cell characterized by the above.