JP3633165B2 - Attachment for spray particle measurement. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an attachment for measuring spray particles for measuring the particle size distribution of various spray particles used for cosmetics and cleaning, for example.
[0002]
[Prior art]
FIG. 4 is a principle diagram of a particle size distribution measuring apparatus using a laser diffraction / scattering method used for measuring the particle size distribution of various spray particles. When the laser light passing through the collimator lens 22 is irradiated from the laser light source 10 to the particle group 21 to be measured, the intensity distribution pattern of diffracted / scattered light is generated spatially. Among these, the intensity distribution pattern of the forward scattered light is condensed by the condensing lens 11 and forms a ring-shaped diffraction / scattered image on the detection surface at the position of the focal length. This is detected by the ring-shaped photodiode array 20. Further, the side scattered light and the back scattered light are detected by the side scattered sensor 23 and the back scattered sensor 24. The particle size distribution pattern detected by the ring-shaped photodiode array 20 varies depending on the size of the particles. Since particles of different sizes are mixed in an actual sample, the light intensity distribution pattern generated from the particle group is an overlap of diffracted / scattered light from each particle, and this overlapped light intensity distribution pattern. Therefore, it is possible to obtain by calculation what size particles and what proportion are included in the sample particle group.
[0003]
In the conventional particle size distribution measuring apparatus, when measuring the spray particles by making the space between the light source 10 and the condenser lens 11 long and the measurement space open or close to the open structure, the spray is directly connected to the laser. -Spraying For this reason, the condensing lens and the spray spray position are separated.
[0004]
[Problems to be solved by the invention]
Due to the principle of the laser diffraction type particle size distribution measuring apparatus, when the condensing lens is separated from the measurement position, that is, the spray spraying position, the measurement range shifts toward the larger particle area. In order to accurately measure fine particles, it is preferable to bring the measurement position (spray spray position) closer to the lens. However, even if it approaches as it is, the spray particles that diffuse will adhere to the lens and become contaminated or damaged, and must be cleaned and repaired each time. In addition, when measuring fine particles, particles of various sizes must be granulated and tested, but it is said that if the microparticles are reduced to a certain extent, there are adverse health effects. is there.
[0005]
The present invention has been made in order to cope with the above-mentioned problems, and spray particle measurement that does not contaminate the condensing lens, improves fine particle measurement accuracy, and can solve problems in occupational safety. The purpose is to provide an attachment.
[0006]
[Means for Solving the Problems]
That is, in order to solve the above-mentioned problems, the present invention can provide the spray particle measurement attachment according to claim 1 so that a predetermined space (4) can be formed in the outer cylindrical body (2) having a large diameter. An inner cylinder (3) having an outer diameter smaller than the inner diameter of the cylinder (2) is fitted, and the space (4) between the outer cylinder (2) and the inner cylinder (3) is inserted. One end is hermetically sealed, and the other end of the space (4) between the outer cylinder (2) and the inner cylinder (3) has a small air discharge port (7) A gap is formed around the inner cylinder (3), a liquid dripping prevention filter (8) is attached to the inner surface of the inner cylinder (3) , and an air inlet (9) is provided in the outer cylinder (2). It is provided.
[0007]
In the invention according to claim 2, the clearance of the air discharge port between the outer cylindrical body having a large diameter and the inner cylindrical body having a small outer diameter is set between the outer cylindrical body and the inner diameter having a small outer diameter. It is characterized in that it is arranged narrower than the internal space between the cylindrical body.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of the spray particle measuring attachment of the present invention used in a spray particle size distribution measuring apparatus, and FIG. 2 is a sectional view taken along the line AA in FIG.
In this spray particle measurement attachment 1, a cylindrical body 3 having an outer diameter smaller than the inner diameter of the cylindrical body 2 is fitted in an outer cylindrical body 2 having a large diameter so that a predetermined space (cylindrical space) 4 can be formed. Then, a short cylindrical spacer 5 is hermetically fitted into one end (left end in FIG. 1) of the space 4 between the outer cylinder 2 and the inner cylinder 3 by press fitting or the like. These outer cylinders 2 and the inner cylinder 3 are fixed. A liquid dripping prevention filter 8 is attached to the inner diameter surface of the inner cylinder 3.
[0009]
An outer cylinder having an outer diameter so as to be in close contact with the outer periphery of the inner cylinder 3 at the other end (right end in FIG. 1) of the space 4 between the outer cylinder 2 and the inner cylinder 3. Another short cylindrical spacer 6 smaller than the inner diameter of the body 2 is press-fitted. As a result, a small gap 7 is provided between the outer cylinder 2 and the inner cylinder 3. The spacer 6 may be press-fitted into the inner diameter portion of the outer cylinder pair 2 as a short cylinder pair whose inner diameter is larger than the outer diameter of the inner cylinder pair 3. As will be described later, the gap 7 serves as an air discharge port (hereinafter, the gap 7 is referred to as an air discharge port 7). An air inlet 9 is attached in the vicinity of one end (left end in FIG. 1) of the outer cylinder 2. In FIG. 1, a parallel light source 10 is disposed in the vicinity of the right side of the spray particle measurement attachment 1, and the parallel light source is projected vertically upward on the paper surface. Reference numeral 11 denotes a condenser lens.
[0010]
The spray particle measurement attachment 1 is configured as described above, and the air discharge port 7 between the outer cylinder 2 and the inner cylinder 3 is set to about 0.5 mm, for example, to introduce air. If compressed air of about 3 to 4 kgf / cm ² is supplied from the port 9, a ring-shaped air curtain 12 can be formed. When the spray particles are introduced from the spray 13 disposed on the left side of the spray particle measurement attachment 1 in the state in which such an air curtain 12 is formed, the spray particles are obtained as shown in FIG. Even after passing through the space 1a in the spray particle measuring attachment 1, it circulates in the air curtain 12 and does not scatter outside.
[0011]
Next, the dripping prevention filter 8 affixed in the inner cylinder 2 is for preventing the drop of the droplet when the spray becomes a droplet. That is, the introduced spray particles hit the inner wall of the inner cylinder 3 to form droplets, and if the air curtain 12 is formed from the right end of the spray particle measurement attachment 1, it is blown off as large particles. However , the dripping prevention filter 8 prevents the liquid curtain 12 from dropping into the measurement chamber as it is when the air curtain 12 is not formed. As the liquid dripping prevention filter 8, for example, a cylindrical portion of a test tube type filter paper can be used.
[0012]
Spray of the invention - an embodiment of the particle measuring attachment 1 Ri der way, space is when sealing the space 4 between the outer cylindrical member 2 and the inner cylindrical body 3 - a support 5 Although press-fitting is performed, the outer cylinder 2 and the inner cylinder 3 are bent and welded using a jig or the like without using the spacer 5 and sealed. May be. Further, when reducing the air discharge port 7 between the outer cylinder 2 and the inner cylinder 3, a jig or the like is used without press-fitting the spacer 6 to the outer surface of the inner cylinder 3. The air discharge port 7 may be provided by bending either the outer cylinder 2 or the inner cylinder 3 in use.
[0013]
【The invention's effect】
As described above in detail, according to the spray particle measurement attachment of the present invention, since the spray particles are not scattered outside the air curtain by the air curtain, the measurement particles are placed near the condenser lens. Can be supplied. Therefore, the precision of microparticle measurement can be improved. Further, since the spray particles do not diffuse in the measurement space, there is no possibility that the examiner sucks fine particles, and the problem of occupational safety can be solved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a spray particle measuring attachment of the present invention used in a spray particle size distribution measuring apparatus.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a view taken in the direction of arrow P in FIG. 1;
FIG. 4 is a principle diagram of a particle size distribution measuring apparatus using a laser diffraction / scattering method.
[Explanation of symbols]
1 spray - particle measuring attachment 2 outside of the cylindrical body 3 inside of the cylindrical body 4 inner space 5 space - Sa 6 space - Sa 7 Air outlet 8 liquid sagging filter 9 air inlet 10 parallel light source 11 a condenser lens 12 Eaka -Ten 13 spray

Claims (2)

An inner cylinder having an outer diameter smaller than the inner diameter of the outer cylinder is fitted into the outer cylinder having a large diameter so that a predetermined space can be formed, and the gap between the outer cylinder and the inner cylinder is set. One end of the space is hermetically sealed, and a gap serving as a small air discharge port is provided around the other end of the space between the outer cylinder and the inner cylinder, and the inner cylinder A spray particle measurement attachment , wherein a liquid dripping prevention filter is attached to an inner diameter surface of a body, and an air introduction port is provided in the outer cylinder. The clearance of the air discharge port between the outer cylinder having a large diameter and the inner cylinder having a small outer diameter is narrower than the internal space between the outer cylinder and the inner cylinder having a small outer diameter. The spray particle measurement attachment according to claim 1, wherein the attachment is arranged around.

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