JPS6133558Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a flame photometer, and its purpose is to obtain a stable flame and improve measurement accuracy.

BACKGROUND OF THE INVENTION It is well known that the measurement of Na and K levels in blood is an important test item in clinical tests.

In the above measurement, a sample is burned in the flame of a flame photometer, and the measurement is performed from the emission spectrum of the sample. Therefore, it was necessary for the flame to burn in a stable state at all times, and the combustion state affected the performance of the flame photometer. However, in conventional combustion methods, the air is only purified with a filter and then supplied to the combustion section, which results in poor flame stability.In order to improve measurement accuracy, it is necessary to integrate the emission spectrum. was low.

Therefore, in order to obtain a stable flame, in addition to the mechanism that mixes the sample, air, and fuel and combusts them, a so-called auxiliary combustion system is used in which combustion air is supplied from below the flame through a slit in a cylindrical layer around the flame. Attempts are being made to do so.

However, when supplying combustion air from below the flame through a slit, the air is guided through a pipe such as a combustion air supply pipe, and the slit turns it into an air sheath (ring-shaped flow). The flow of air in the vicinity increased, making it difficult to create a uniform circular flow.

Purpose of the invention Therefore, the purpose of the present invention is to eliminate the above-mentioned drawbacks, obtain a stable flame, and improve measurement accuracy.

Structure of the device As a result of research, the inventor found that in order to form a stable flame, it is not enough to prevent pulsation, and that the presence of carbon dioxide gas remaining at the bottom of the sea squirt is a factor that causes fluctuations in the annular air flow. We confirmed the fact that the stabilization of the annular flow is hindered. That is, the present invention uses combustion air supplied through a duct that prevents outside air from entering the combustion section of a flame photometer that burns a sample and analyzes the sample from its emission spectrum, and the sample, air, and fuel. In a flame photometer that cleans and supplies mixing air to a premixing chamber for mixing the ascidians, an annular air reservoir is provided outside the ascidian and is formed by an annular duct surrounding the ascidian. By forming an annular air outflow slit at the lower end of the annular inner side of the duct, the air flows out horizontally towards the center, completely sweeping out the heavy carbon dioxide gas that tends to remain at the bottom, and eliminating the flame. It is designed to form a stable cylindrical air layer around it.

An example of the present invention will be described below with reference to the drawings.

In the drawing, clean air from a clean air blower 9 is conveyed by a mixing air line 10 to a premixing chamber 5 and a combustion air line 8 to an annular air reservoir 3 formed by an annular duct 4, respectively. The sea squirt 1 is installed so that a slit 11 of about 1 to 2 mm is formed in an annular shape between the lower end of the sea squirt 1 fitted inside the duct 4 and the bottom upper surface of the annular duct 4. On the other hand, the sample 7 from the sample suction tube 6 is placed in the premixing chamber 5.
The fuel from the fuel supply pipe 12 is mixed with the clean air and ejected from the burner inserted into the sea squirt 1.

With the above configuration, in the conventional configuration where the air chamber has a uniform thickness or the slit is installed at the top of the air chamber,
The drawback of insufficient uniform flow of the air leaving the air supply tube through the slit in an annular shape has been overcome. This is done by providing an annular air reservoir and setting the air supply pipe so that air is introduced into the upper part of the air reservoir, so that the introduced air is forced downward and directed from the annular slit at the bottom inside the air reservoir to the center. At this time, the carbon dioxide gas remaining at the bottom of the sea squirt is swept away by the air flow, and this is coupled with the fact that the pulsation of the air flow is absorbed by the buffering action of the air reservoir 1. The flame 2 supported on all sides by the cylindrical stratified air layer becomes a very stable flame, and its combustion condition is ideal.

Effects of the invention Therefore, as described above, a very stable and ideal flame can be obtained with a simple mechanism, and the measurement accuracy has been significantly improved. In addition, since the flame is stable, it is possible to use a direct current amplification method as the measurement system, which plays a significant role in reducing the cost of the flame photometer, and other remarkable effects can be obtained in this type of photometer.

[Brief explanation of the drawing]

The drawing shows an embodiment of the present invention, and is a partial cross-sectional side view. 1... squirt, 2... flame, 3... annular air chamber,
4...Duct, 5...Premixing chamber, 6...Sample suction tube, 7...Sample, 8...Combustion air pipe, 9...Clean air blower, 10...Mixing air pipe, 11...
Slit, 12...Fuel supply pipe.

Claims (1)

[Scope of utility model registration request] Combustion air is supplied through a duct that prevents outside air from entering the combustion section of a flame photometer that burns a sample and analyzes the sample from its emission spectrum;
In a flame photometer that supplies mixing air to a premixing chamber for mixing a sample, air, and fuel, an annular air reservoir 3 is formed outside the sea squirt 1 by an annular duct 4 surrounding the sea squirt 1, An annular slit 11 is provided at the lower part of the annular inner side of the annular duct 4, and the combustion air introduced into the upper part of the air reservoir 3 is pressed downward to flow horizontally from the lower end of the air reservoir toward the center. A flame photometer that is characterized by forming a stable cylindrical air layer around the flame.