JPH059653U - Sealed structure of plastic tube for centrifuge - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to prevent leakage of a sample in a tube in a structure for sealing a tube for a centrifuge. [Structure] The plug 4 is provided with a tapered inner wall surface portion 6 so as to contact the outer peripheral surface 8 of the upper end portion of the tube 1, and the outer peripheral surface 8 of the upper end portion of the tube 1 and the tapered inner wall surface portion 6 are brought into close contact with each other to seal the sample.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for sealing a fluid when rotating the fluid at a high speed like a centrifuge.

[0002]

[Prior Art]

 There is USP 4690670 as a conventional technique. In the present invention, the inner peripheral surface 9 of the tube 1 is sealed as shown in FIG. 4, and the V-shaped ring 11 is provided on the back surface of the head of the plug 4 as shown in FIG. There is something that can be cut into the upper end surface 10.

[0003]

[Problems to be solved by the device]

 In the conventional plug 4, the contact portion with the upper end surface of the tube 1 is generally horizontal and flat. When sealing is performed using such a plug 4, the upper end surface of the tube 1 is pulled out to the outside 1 and sealed at the inner surface of the tube 1. However, since the inner surface of the tube 1 is threaded by the plug 4, the surface is rough, and the centrifugally separated sample that generates a high hydraulic pressure in the centrifugal force field is easily leaked.

Further, in the method of the V-shaped ring 11, since the wall thickness of the tube 1 is thin, sealing is performed in a very small area of the upper end surface 10 of the tube 1, and it is not always necessary to centrifuge the sample for centrifugation in a high centrifugal force field. Sealing is not possible. The present invention aims to realize reliable sealing of a centrifugally separated sample even in a high centrifugal force field.

[0005]

[Means for Solving the Problems]

 The purpose of the above is to make the shape of the part of the plug that contacts the tube opening tapered so that it contacts the outer surface of the upper end of the tube so that the tube will not be pulled out to the outer periphery, and not the inner surface of the tube but the outer surface. That is, it is achieved by sealing with a smooth surface that is not damaged.

[0006]

[Action]

 When the above plug is screwed into the tube, when the plug hits the upper end surface of the tube, the outer peripheral surface of the tube is pulled toward the center axis by the tapered inner wall of the plug, and the outer peripheral surface of the tube and the tapered inner wall surface of the plug are separated. The sample is closely attached and the sample is sealed.

[0007]

【Example】

 FIG. 1 is a sectional view showing the basic shape of the hermetically sealed structure of the present invention, and FIG. 2 is an enlarged view of portion A of FIG. FIG. 3 is a sectional view showing a tube. Cover the tube 1 with the crown 3 and screw in the plug 4 with a fastening tool. When the plug 4 is screwed in, the tube outer peripheral surface 8 is finally drawn to the central axis side and sealed by the tapered inner wall surface 6 of the plug 4. In this sealing method, the sample in the tube 1 does not leak because the inner peripheral surface 9 of the tube is sealed with the outer peripheral surface 8 instead of the rough surface.

[0008]

[Effect of the device]

 According to the present invention, when the plug is screwed into the tube and hits the upper end surface of the tube, the outer peripheral surface of the tube is pulled toward the central axis by the tapered inner wall of the plug, and the tapered inner wall and the outer peripheral surface of the tube are tightly sealed. Since this is done, sealing is performed not on the inner peripheral surface of the rough tube but on the smooth outer peripheral surface, and the sealing performance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a sealing structure according to the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a cross-sectional view showing a tube.

FIG. 4 is a sectional view showing an example of a conventional technique.

FIG. 5 is a cross-sectional view showing another example of the conventional technique.

[Explanation of symbols]

1 is a tube, 2 is a tube opening, 3 is a crown, 4
Is a plug, 5 is a threaded portion of the plug, 6 is a tapered inner wall surface of the plug, 7 is a hole for inserting a fastening tool, 8 is an outer peripheral surface of a tube upper end portion, 9 is an inner peripheral surface of a tube upper end portion, 10
Is the upper end face of the tube, and 11 is the V-shaped ring of the plug.

Claims (1)

[Claims for utility model registration] [Claim 1] A plastic tube for a centrifuge and a structure for achieving the sealing, a plastic tube having an opening for injecting and extracting a sample in the upper part, and an outer peripheral part of the upper part of the tube A crown provided to surround the
A means for inserting a fastening tool in the upper part, and a tapered inner wall surface part at a position in contact with a screw part screwed to the inner peripheral part of the opening part of the tube and an outer peripheral surface of an upper end part of the opening part of the tube. A structure for sealing a plastic tube for a centrifuge, comprising a plug having