JPH0541405Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a sample tank used in a laser diffraction particle size distribution measuring device.

[Conventional technology]

In a laser diffraction particle size distribution analyzer, when a laser beam is irradiated, a sample tank is provided separately from the sample cell, and a dispersion medium (e.g. water) is removed in this sample tank.
A sample powder (for example, 0.1 to 200 μm powder) is mixed therein to obtain a sample liquid (dispersion liquid) in which particles are appropriately dispersed.

FIG. 2 shows a conventional sample tank 30, and an ultrasonic vibrator 32 is provided on the lower surface of the horizontal bottom 31 of the sample tank 30 for dispersing the sample by applying ultrasonic vibration to the sample liquid. be. Also, 33, 34
is a drain joint and a return joint as an outlet and return port for the dispersion liquid, and the drain joint 33 is provided on the lower surface of the bottom part 31 and is connected to one side of the sample cell and the drain port via piping and a pump (not shown). A return joint 34 is provided protruding from the middle of the side wall 35 of the sample tank 30, and is connected to the other sample cell via a pipe (not shown). 36 is a stirring blade provided in the sample tank 30.

[The problem that the idea aims to solve]

However, in the sample tank 30 configured as described above, since the bottom part 31 is horizontal, when the sample powder is large or heavy particles, it takes time to drain the sample liquid from the sample tank 30 and to clean the sample tank 30. It had some drawbacks.

Further, in the sample tank 30, since the return joint was provided in the middle of the side wall 35, there was a drawback that the cleaning effect on the upper surface of the bottom portion 31 was not good.

The present invention was made with the above-mentioned considerations in mind, and its purpose is to use laser diffraction technology that allows the sample liquid to be discharged as quickly as possible and that allows the interior to be reliably cleaned. An object of the present invention is to provide a sample tank for a type particle size distribution measuring device.

[Means to solve the problem]

In order to achieve the above object, the sample tank for the laser diffraction particle size distribution analyzer according to the present invention has its bottom tilted at 15 to 20 degrees with respect to the horizontal direction, and the return joint is positioned above the drain joint. Moreover, it is located at the bottom of the side wall of the sample tank.

[Effect]

According to the above configuration, since the bottom of the sample tank is inclined by 15 to 20 degrees with respect to the horizontal direction, the sample liquid can be discharged more quickly than before, and cleaning can also be performed faster. Since the inclination angle of the bottom part is small, the sample dispersion effect by ultrasonic vibration is not impaired compared to the conventional method, and the sample liquid can be reliably dispersed. And the return joint,
Since it is provided above the drain joint and at the bottom of the side wall of the sample tank, the top surface of the bottom of the sample tank can be reliably washed away.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 schematically shows a laser diffraction particle size distribution measuring device using a sample tank according to the present invention. A driven stirring blade 2 is provided and is configured to uniformly mix and stir a sample liquid 3 consisting of water as a dispersion medium and sample powder.

4 is the bottom of sample tank 1, 15~
It is tilted at 20 degrees, and an ultrasonic vibrator 5 is provided on the lower surface of the sample liquid 3 for dispersing the sample by applying ultrasonic vibrations to the sample liquid 3.

Reference numerals 6 and 7 are a drain joint and a return joint, respectively, which serve as connections with an analysis section 8, which will be described later. They are respectively protrudingly provided near the lower end of the side wall 9.

The analysis section 8 includes a rectangular cylindrical sample cell 10 and a sample cell 1 provided on one side of the sample cell 10.
a laser light source 11 that projects a laser beam onto the sample cell 10; and a condenser lens 12 provided on the other side of the sample cell 10.
and a detector 13.

The sample cell 10 is different from the sample tank 1 through piping 1.
4 and 15. That is, the lower opening 16 of the sample cell 10 and the drain joint 6
Piping 14 is provided to connect between the
Further, a pipe 15 is provided to connect between the upper opening 17 of the sample cell 10 and the return joint 7. A suction pump 18 is connected to the pipe 14.
is interposed therein, and is connected to a drain tank 21 as a drain section via a drain pipe 20 equipped with a pinch valve 19. Therefore, the lower opening 16 of the sample cell 10 is connected to the drain tank 21.

An overflow part 22 is provided below the sample cell 10, that is, in the vicinity of the lower opening 16, for receiving the sample liquid 3 leaked from the sample cell 10. 23 and a drain pipe 2 on the lower end side.
An overflow discharge pipe 24 is connected to the drain tank 21 so that the sample liquid 3 leaking from the sample cell 10 quickly flows into the drain tank 21.

In the laser diffraction particle size distribution measuring apparatus having the above configuration, first, water and sample powder are put into the sample tank 1 to prepare the sample liquid 3, and the ultrasonic vibrator 5 is operated to generate ultrasonic vibrations. While adding , the stirring blade 2 is rotated to stir and mix the sample liquid 3. In this case, since the bottom part 4 has an inclination of 15 to 20 degrees, almost the same sample dispersion effect as in the case where the bottom part 4 is horizontal is obtained, and the sample liquid 3 becomes a uniformly dispersed liquid. Note that when the slope of the bottom portion 4 exceeds 20°, the sample dispersion effect decreases.

During particle size measurement, when the suction pump 18 is operated with the pinch valve 19 closed, the sample liquid 3 is circulated between the sample tank 1 and the sample cell 10 via the pipes 14 and 15.

After a predetermined measurement is completed, when the suction pump 18 is stopped and the pinch valve 19 is opened, the sample liquid 3 in the sample tank 1 and the sample cell 10 is discharged to the drain tank 21 via the drain pipe 20. In this case, since the bottom portion 4 is tilted, the sample liquid 3 in the sample tank 1 is quickly discharged. Note that if the inclination of the bottom portion 4 is smaller than 15°, the discharge effect will be reduced.

When the discharge of the sample liquid 3 is completed, the pinch valve 19 is closed again, the rinsing liquid is put into the sample tank 1, and the stirring blade 2 and the suction pump 18 are operated to clean the inside of the sample tank 1. By circulating the rinsing liquid through the piping 14, the sample cell 10, and the piping 15, the insides thereof are cleaned. In this case, since the return joint 7 is provided near the lower end of the side wall 9, the upper surface of the bottom 4 of the sample tank 1 can be reliably washed away. After this cleaning is completed, the pinch valve 19 may be opened again to drain the rinsing liquid into the drain tank 21. In this case, since the bottom portion 4 is inclined, it goes without saying that the rinse liquid 3 in the sample tank 1 is quickly discharged.

[Effect of idea]

As explained above, according to the present invention, the sample liquid and rinsing liquid can be quickly discharged without reducing the sample dispersion effect caused by ultrasonic vibration, and the cleaning effect can be enhanced. Measurements can be performed quickly and with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a laser diffraction particle size distribution measuring apparatus using a sample tank according to the present invention. FIG. 2 is a sectional view showing a conventional sample tank. DESCRIPTION OF SYMBOLS 1... Sample tank, 4... Bottom, 5... Ultrasonic transducer, 6... Drain joint, 7... Return joint, 9... Side wall, 10... Sample cell, 1
4, 15... Piping, 18... Suction pump, 21...
...Drain part.

Claims (1)

[Scope of utility model registration request] A laser diffraction device having an ultrasonic oscillator on the lower surface of the bottom, a drain joint connected to a sample cell and a drain part via piping and a pump, and a return joint connected to the sample cell via piping. In the sample tank for the type particle size distribution analyzer, the bottom part is 15 mm in the horizontal direction.
A sample tank for a laser diffraction particle size distribution analyzer, characterized in that the sample tank is tilted by ~20° and the return joint is provided above the drain joint and further below the side wall of the sample tank.