JPH025407Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a particle detection tube that sucks a solution in which particles are suspended through a fine hole in the lower part of the tube and electrically detects particles passing through the fine hole.

Generally, this type of particle detection tube handles solutions and uses electrical effects to detect particles.
Therefore, particle detection tubes constantly suffer from leakage, corrosion due to electrochemical action, and external noise. For example, if a stainless steel shield tube is placed integrally with the tube to prevent external noise, the shield tube will be exposed to electrochemical action and rust due to the solution. Once coated, the machining accuracy deteriorated and leakage occurred. Considering this point, conventional particle detection tubes use a double injection molding method to encapsulate a shield tube inside the tube to prevent corrosion and liquid leakage, and also to connect the tube to the body threaded part through a connecting screw. The external electrode hanging outside the tube was electrically connected to the shield tube to create an equal potential and prevent external noise.

However, with the above-mentioned tube structure, the manufacturing method is complicated, and since the cylinders inside and outside the shield tube are fused together at the top and bottom, stress concentration occurs in that part. Therefore, if this particle detection tube is used in a place where various chemicals are handled, stress cracking may occur depending on the material.

In addition, in conventional particle detection tubes, the external electrode is suspended outside the tube from the threaded part of the main body and fixed with a connecting screw, so inspectors may forget to attach the external electrode before use, resulting in a loss of time. During use, the external electrode is often lost when repeatedly pulling a container containing a sample (solution) with the external electrode, or when cleaning the tube after use. Conventional particle detection tubes are made up of a shield tube and a synthetic resin tube with microscopic pores, so when cleaning this tube, the electrical contacts of the shield tube will rust. be.

The present invention was developed in view of the above-mentioned drawbacks, and its purpose is to have a simple structure that allows the tube to be attached to and detached from the shield tube without causing liquid leakage, and to make the external electrode integral with the shield tube so that it does not protrude outside. An object of the present invention is to provide a particle detection tube that prevents particles from being detected.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is a shield tube. This shield tube 1
is made of a material such as iron or stainless steel, and has a flange 2 at its upper end, a step 3 at its inner upper part, and a female thread 4 at its lower part. Further, the outside of the shield tube 1 except for the flange 2 is coated with a synthetic resin 5.
This is to prevent the shield tube 1 from rusting even if it is immersed in a solution.

The tube 6 made of synthetic resin is held by the shield tube 1 with a flange 7 provided at the upper part in contact with a step 3 of the shield tube 1. A fine hole 8 communicating with the inside is formed in the lower part of the tube 6, and a groove is formed slightly above the fine hole 8, into which a gasket 9 is fitted. The lower part of the tube 6 is held by a cap 10 connected to the lower end of the shield tube 1. The cap 10 is made of synthetic resin to prevent the exposed portion from rusting, and a cap auxiliary tool 17 made of a conductive material is integrally attached to the inside. This cap 10 uses a gasket 11 in its connecting portion to maintain watertightness with the shield tube 1, and is screwed into the internal thread 4. The lower part of the cap 10 has a gasket 9 in the groove of the tube 6.
The space between the pipe 6 and the pipe 6 is kept watertight by contacting the pipe 6.

Further, as shown in FIG. 2, the external electrode 12 is arranged so as to go around the cap 11, and both ends of the external electrode 12 pass through the thick part of the cap 11 and are electrically connected to the inside of the cap 10. connected. For this external electrode 12, it is desirable to use a chemically stable material such as platinum.

The other electrode, the internal electrode 13, is shaped like a pipe and is disposed inside the tube 6, extending close to the micropore 8. This internal electrode 13 not only serves as an electrode, but is also used when filling the tube 6 with a diluent, for example.

14 is a connecting screw. When this connecting screw 14 is screwed into the main body threaded portion 15, it engages with the flange 2 of the shield tube 1 to connect the shield tube 1 to the main body threaded portion 15. At this time, the upper end of the tube 6 held by the shield tube 1 is connected to the through hole provided in the threaded portion 15 of the main body to maintain airtightness. Further, the main body threaded portion 15 and the shield tube 1 are electrically connected via the connecting screw 14.

In addition, 16 is an electric circuit, which includes an external electrode 1.
2 and internal electrode 13 are connected to each other.

In this way, the tube 6 has a simple structure and can be attached to and detached from the shield tube 1 without leaking.
The external electrode 12 is integrated with the shield tube 1 and is prevented from protruding to the outside.

The particle detection tube configured in this manner is connected to the main body threaded portion 15, and a portion thereof is immersed in a container (not shown) containing a sample (solution). The tube 6 is prefilled with a diluent, for example, physiological saline when measuring the number of red blood cells as a sample, through the pipe-shaped internal electrode 13. This is to ensure that there are no errors in quantitative measurements. Thereafter, a constant current is passed through the sample through the external electrode 12 and the internal electrode 13, and a certain amount of the sample is sucked through the micropore 8.

When particles in the sample, such as red blood cells, pass through the micropores 8, a potential difference is created between the outer electrode 12 and the inner electrode 13. The electric circuit 16 processes the potential difference into pulses, counts the pulsed signals, and displays the number.

After counting the number of red blood cells in the sample in this manner, the inspector removes the connecting screw 14 from the threaded portion 15 of the main body and takes out the tube 6 from the shield tube 1 for cleaning. The inspector then cleans the tube 6, wipes off the moisture with a dry cloth, and returns the tube 6 to its original assembled state.

As explained above, according to the present invention, the tube is configured separately from the shield tube and is detachable, so there is no liquid leakage, and since only the tube can be cleaned, the shield tube is electrically disconnected during cleaning. No rust on contact parts. Further, according to the present invention, since the external electrode is integrated with the shield tube, its handling is convenient, and there is no need to repeatedly pull the container with the external electrode as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention. FIG. 2 is an external view of a part of FIG. 1. 1... Shield pipe, 2, 7... Flange, 3...
...step, 4...female thread, 5...synthetic resin coating,
6...Tube, 8...Minute hole, 9, 11...Packing, 10...Cap, 12...External electrode, 13
... Internal electrode, 14 ... Connection screw, 15 ... Main body screw part, 16 ... Electric circuit.

Claims (1)

[Scope of utility model registration request] A shield tube and a synthetic resin tube having fine holes at the bottom are connected to the threaded part of the main body with a connecting screw, and the shield tube and an external electrode arranged outside the tube are electrically connected, and In the particle detection tube, in which an internal electrode is disposed to suck a solution in which particles are suspended through the micropore, and particles passing through the micropore are detected by a potential difference between the internal electrode and the external electrode, the shield tube The outside of the shield tube is coated with synthetic resin, and the tube is held by this shield tube and connected to the threaded part of the main body, and the lower part of the tube is held watertight by a cap connected to the lower end of the shield tube, and the thick part of the cap is A particle detection tube, characterized in that the external electrode is connected to a shielded tube by allowing the external electrode to pass therethrough.